If you think your garden or space is looking drab, growing proteas may be just what you need. With their unique appeal and sculptural shapes, they can be the statement shrubs that will add character to your plant collection.
While proteas originated from South Africa, they are typically included in floral arrangements alongside known Australian natives. Related to native plants like macadamias, grevilleas, and banksias, proteas can be grown in most areas in the country.
Choosing the Proteas to Grow in Australia
With the interesting shapes and striking, year-round blooms of proteas, planting these shrubs will certainly bring life to your garden. However, with over a hundred protea cultivars and hybrids, which one should you choose?
From varieties with the largest flowers to interesting blooms that can add a unique appeal to arrangements, here are some of the most popular proteas that you can grow in Australia:
Proteas with Showy Blooms
If you want a head turner in your garden, consider growing these bold protea varieties:
King Protea
When you want to have showstopping flowers, you won’t go wrong with king protea. As the national flower of South Africa, this bloom is considered among the most iconic protea varieties.
Some of the identifying features of the king protea include its green leaves with a texture that resembles leather. Typically growing into a rounded bush, this plant is more widely recognised for its huge, crown-like blooms that can grow as wide as 15 to 30cm.
Queen Protea
Living up to its name, the queen protea has majestic and elegant blooms that can add breathtaking beauty to your garden. The second-largest protea variety, this plant usually has pink blooms that can grow as wide as 15 to 20cm.
What’s more, the queen protea has an upright growing habit, reaching up to around 2m tall. You may notice that it grows slowly, but when taken care of, it can live for several decades.
Duchess Protea
An upright and dense shrub, the duchess protea variant can grow around 2 to 4m high. Because it has veiny and large leaves that are shaped like a heart or oval, it is also referred to as broad-leaf sugarbush.
Also, the flowers of a duchess protea are easily recognisable, especially since they can grow as wide as 12cm when they fully bloom.
Proteas that are Perfect for Gardens and Indoor Displays
If you want versatile proteas that you can plant in the garden or add as a statement piece for floral arrangements, these are the perfect varieties:
Bot River Protea
Originating from South Africa’s Botrivier, bot river protea is among the most popular Proteaceae varieties used for cut flowers. What’s more, it’s characterised by its flower heads that resemble wine glasses. When the light touches them at the perfect angle, they can appear as if they’re glowing.
Growing like a lanky shrub, this species can reach up to 3.5m in height. You can also recognise it by the upward curving, narrow leaves that surround its stems.
Common Sugarbush
Protea repens, or more widely known as ‘common sugarbush’, is also among the varieties you can grow in an Australian garden. While its name ‘repens’ means ‘creeping’ in Latin, it doesn’t have a crawling growth habit. Like many protea plants, it also grows upright, producing robust branches.
While its flowers have the signature cone shape that most proteas have, its blooms look different because its bracts don’t have fuzzy hairs. Traditionally, common sugarbush plants were harvested in South Africa for their nectar. The sweet, ruby-red syrup collected from them, known as bossiestroop, was used as a remedy for coughs and a substitute for sugar.
Narrow-Leaf Sugarbush
Also known as blue sugarbush or oleanderleaf protea, narrow-leaf sugarbush is a favourite among gardeners in Australia and around the world. You’ll love having this in your garden because its long-lasting, aesthetically striking blooms typically attract birds.
This protea variety is easily recognisable by its bluish-green, thin, and long leaves. Its bracts also have tiny, fuzzy hairs with colours that range from white to purplish-black.
Protea Pink Ice
Often featured in floral arrangements and bouquets, protea pink ice also symbolises change and courage. After all, this beauty can thrive even in harsh environments and was even traditionally used in South Africa as a remedy for skin issues and digestive problems.
What’s more, it produces cone-shaped blooms with frosted, dusty pink bracts. With their leathery texture and narrow, dark green appearance, the leaves of protea pink ice are as captivating as its flowers.
Red Sugarbush
Protea grandiceps, or red sugarbush is a hardy evergreen shrub that can produce coral-red blooms throughout the warmer months. Because it has cool-toned foliage, its crimson flowers naturally stand out when planted in the garden.
Red sugarbush flowers also have hairy, inward-curving bracts that conceal a cream-coloured floral mass. Also, because protea grandiceps grows slowly, it’s not widely known to produce cultivars or hybrids.
Peculiar-Looking Proteas
If you want to add character to your garden, here are some protea varieties with unique features:
Clasping-Leaf Protea
Compared to popular protea varieties, the clasping-leaf protea is a sprawling shrub that only grows to about 0.5m in height. As this plant matures, its stems tend to hang or trail, giving it a cascading appearance.
While clasping-leaf protea has unique qualities, don’t expect it to be a showstopper. Often, the purple or maroon blooms of this shrub stay hidden underneath its leaves. Despite that, the leaves can be the highlight of the plant, with their pink edges and greyish-green colour.
Since clasping-leaf proteas are slow growers, they are ideal when you want a plant to cover your garden bed. However, since they have a trailing growth habit, you can also grow them in a hanging pot, along the edges of a retaining wall, or over slopes.
Scarlet Sugarbush
If you’re a fan of Daenerys Targaryen, you’ll love the scarlet sugarbush. With its ovoid-shaped flower heads, you’ll have blooms that resemble dragon eggs in your garden.
Another interesting feature of scarlet sugarbush is the way the flowers hang downward, protecting its pollen and nectar from the elements. Moreover, the subtle gradient colour of its bracts adds to the charm of the plant.
You’ll love how the bracts transition from light yellow to white, and towards their tips, their colours can range from salmon, orange and pink.
Sulphur Sugarbush
Sulphur sugarbush is another protea variety with rounded flower heads surrounded by colourful bracts. Its flower heads are often yellow, which is where it got its name “sulphur”. Plus, you’ll also love this evergreen shrub’s leaves that shift colours as the season changes.
The foliage of sulphur sugarbush starts off with a bluish-green colour, but as it becomes warmer, it changes to yellow. Eventually, as the months become colder, the leaves appear to have a pastel tone.
Since sulphur sugarbush doesn’t grow tall, it’s ideal as a ground cover for your garden bed. However, it can still survive and look great when cultivated in pots.
Proteas that are Perfect for Small Spaces
If you’re planning on growing proteas in pots, these varieties would be the ideal options:
Dwarf King Protea
Dwarf cultivars like little prince, white crown, and autumn prince are shrubs that can only grow up to three feet or one metre tall. So, if you want the regal appeal of a king protea but you don’t have the space for it, opt for one of these compact cultivars.
For instance, if you opt for autumn prince, you’ll have a protea that can only grow up to a metre tall, producing pink blooms that can be around 15cm wide. Little prince cultivar grows about the same height as autumn prince, but its red bracts can only grow up to 5cm across.
Protea Pandora
A hybrid of protea pityphylla, protea pandora is a low-growing shrub that’s perfect as ground cover. Since the original form of this variety is near-threatened, it can be challenging to find it. However, hybrids of p. pityphylla, such as protea pandora, can be found in many plant nurseries in Australia.
If you want a statement plant in your sunny balcony, this compact yet striking shrub is perfect, as it can only grow about a metre tall. Plus, it offers a structured, tidy look with its elongated, dark-green leaves. However, what you’ll love about it is its red blooms with fuzzy white tips.
Thistle Sugarbush
Thistle sugarbush is another compact and neat protea variety that’s perfect for growing in pots. Compared to other proteas in this list, thistle sugarbush is a bit taller, growing up to 1.5m in height. However, if you want to keep it smaller, you can prune it.
It’s also a perfect patio plant when you want dainty flowers. After all, its yellowish-green blooms can only grow up to 5cm wide. What’s more, as ground cover, it looks a lot like the thistle flowers.
Growing Proteas from Cuttings
If this is your first time growing proteas in Australia, the easiest way to do so is by propagating them from cuttings. However, when you opt for this method, you need some patience because the plant will require a well-managed environment.
When choosing the cuttings, make sure you opt for semi-hardened, healthy shoots, specifically the stems right below the bud or the flower. Also, cut the stem just below the node while ensuring that the stem is 10 cm long with two to three leaves at the top.
Once you’ve taken the cuttings, here are the general care steps:
- Expose more stem tissue by taking a nick from the base.
- After dipping the cutting in rooting hormone, dip it in a propagation mix of vermiculite, peat moss, and horticultural sand.
- Make sure to place your protea cuttings under high humidity, ideally under a misting system in an area that gets indirect sunlight.
- Within eight weeks, the cuttings will start to take roots and you can move them directly to the ground in your garden.
How to Determine if Your Garden Has the Ideal Soil for Growing Proteas
If you’re planning to grow proteas in your garden, you have to ensure that you have the right soil, especially since the plant can be picky when it comes to soil. However, if your soil is not suitable for proteas, there are some steps you can take to amend it.
As such, you need to know what kind of soil you have in your garden to make sure that your proteas can survive. Here’s a general guide to checking your garden soil:
Clay Soil
In general, clay soil is compact and heavy, making it difficult for certain plants to establish their roots. Moreover, if you have heavy clay soil, it won’t drain well and may waterlog your plants.
During drier months, clay soils tend to crack, making them difficult to rehydrate. Therefore, if you have moderate to heavy clay soil, you need to improve its quality by digging in gypsum and composted woodchip mulch. To improve drainage, make sure to break up residual clay.
Sandy Soil
Sandy soils generally contain the opposite qualities of clay soil, especially since they’re free-draining and quite open. However, this characteristic can still be problematic because nutrients and water may pass quickly through the soil before your protea can absorb them.
To slow down the drainage, you can add organic matter such as dried leaves and composted woodchips.
Loamy Soil
If you’re a gardener, you likely love loamy soil. Containing a combination of sand, silt, and clay, this free-draining soil is crumbly and yet retains moisture well. So, if you have loamy soil, you don’t need to do anything to amend it.
Soil pH
The pH level of the soil in your garden is also crucial because it determines the availability of nutrients, directly affecting the growth of your proteas. For most protea varieties, the ideal soil pH is around 5 to 6. However, they’ll still survive in soils with pH levels that are slightly below or above the recommended numbers. To be certain about the pH level, you can purchase a pH test kit from a hardware store or your local nursery and start testing your soil.
Because proteas don’t thrive in soils that are high in phosphorus, it’s best to opt for acidic soils. What’s more, it’s ideal to grow proteas in soils with a pH level below 6 so that they can absorb as much iron as they need to keep their foliage healthy.
However, once your soil pH goes below 4.5, the essential macronutrients become unavailable to your proteas. To raise the pH level, purchase agricultural or garden lime and mix it into the soil. The calcium carbonate in the lime should raise the pH level, and you can check the results by using the test kit.
Conversely, if the pH level of your soil exceeds 7, you can add elemental sulphur to make it more acidic. However, be careful when doing so because over time, the levels may go back to being alkaline or neutral. To help lower the soil’s pH, you can add iron sulphate to the root area of your proteas. Also, when you notice the foliage turning yellow, give the plant an iron boost.
Choosing a Spot for Your Proteas in Your Garden
After ensuring that your garden has the right soil to grow protea, your next task is to choose where to plant it. Select an area that gets a good amount of sunlight and air to help the plant produce more flowers. However, your protea can still survive in a semi-shaded area.
Also, avoid areas in your garden where you applied phosphorus before. Depending on the type of soil you have, previous fertilisers may still be present. Compared to sandy soils, clay soils may retain more nutrients, with phosphorus binding to them for a long period.
So, if you plan to grow your proteas in old flower beds, only do so if you’re absolutely certain that you didn’t use phosphorus there. Also, they tend to thrive away from other plants that need to be fed regularly.
Once you’ve chosen the ideal position, dig a hole that’s not any deeper than the tray from where the cutting came from. After planting the protea, firm the soil around it and add stakes if you think it needs support.
Mulch
To protect your protea’s surface roots and ensure adequate moisture retention, use natural mulch such as straw, bark, or leaves. Also, don’t use herbicides to keep weeds at bay. Instead, pull the weeds out by hand.
Watering
Once your proteas are established, you can expect them to stay tough as long as you water them regularly. During hotter months, you need to water your plants at least twice a week. However, during the earlier stages of your proteas, you shouldn’t let the soil around their root system dry out completely.
Around two years after planting your proteas in your garden, they’ll likely become established, and you can slowly reduce watering. From here on, the watering schedule for your protea will depend on whether the variety you’re growing is considered to tolerate drought well.
Pruning
Pruning is also important for proteas because without it, the plant can get thick and heavy, causing it to collapse. However, when pruning, avoid the non-flowering stems, as they will be the ones to produce flowers the following year. For younger protea bushes, prune during the spring and towards the end of the summer.
Moreover, when you’re pruning an older, neglected protea, don’t remove more than 50% of the leaves. At the same time, ensure that the stems you leave have at least 15 cm of healthy leaves left.
After you’ve pruned your proteas, expect the cut stems to produce around three flowering stems in the following season. Also, note that the number of stems increases as your proteas mature.
However, the length of the stems most likely will be shorter. So, if you want them to grow longer, you need to thin the bush. To do this, take some of the stems from the centre of the bush and pull them out completely.
For mature protea plants, here are the pruning steps:
- After your protea bushes start flowering and the colours of the blooms have faded, take sharp secateurs and start pruning, leaving healthy stems at around 10 cm in length.
- Start trimming non-flowering stems to the same height as the stems you just cut.
- If there are stems lying on the ground or ones that appear curly, remove them.
Growing Proteas from Seeds
If you’re up to the challenge, you can give growing proteas from seeds a try. However, if you’re not yet ready to sow your seeds, make sure to store them in the fridge or keep them in a cool area away from direct sunlight.
When to Plant Your Protea Seeds
The best time to plant your protea seeds is during the cooler months, ideally between March and May. Don’t do it during the summer because if it gets too hot, the sun may scorch the seedlings. On the other hand, when you plant your protea seeds during the autumn season, the shifting temperatures from the warm days and cool nights can help in germination.
Choosing the Propagation Media for Your Protea Seeds
When you’re growing proteas from seeds, your propagation media must drain well to ensure that your seeds can hold moisture and won’t dry out. Some of the ideal propagation media for protea seeds include:
- Coconut Fibre: Also known as coir peat, this can be great for retaining moisture.
- Perlite: This lightweight material lets water and air pass through the media.
When mixing your propagation media, combine one part coconut fibre and four parts perlite. This mix will do well enough, and you won’t need to add fertilisers or compost to it. If you’re not planning to use the propagation media right away, remember to store it in an airtight container.
Pre-Treating Your Protea Seeds
Before you sow your protea seeds, you also need to place them under heat treatment to achieve optimal germination rates. At the same time, pre-treating the seeds can help prevent fungal pathogens from spreading, which are usually carried by the outer layer of the seeds.
To pre-treat your protea seeds, follow these steps:
- Take a small cloth bag or hessian fabric and place the seeds in it. Secure the wrapping to ensure that the seeds won’t fall out.
- In a pot, heat some water and use a thermometer to check if the temperature has reached 55°C.
- Let the seeds sit in the pot for 20 minutes, but regularly check the temperature to ensure it won’t go over 55°C. Anything hotter than that may kill the seeds.
If you’re growing protea varieties with larger seeds, such as leucadendrons and leucospermums, you need to break down the seed coat using hydrogen peroxide. For this additional step, you’ll need 1% hydrogen peroxide, which is usually available in pharmacies. If you can’t find this product in the right concentration, you can dilute the solution.
For example, if you can only buy 3% hydrogen peroxide, mix one part of the solution with two parts water to create a 1% concentration. Once you have the right concentration, take the seeds and immerse them in the solution for 24 hours. After that, rinse the seeds and perform the heat treatment steps above.
Sowing Your Protea Seeds
Right after you’ve finished the heat treatment, you must sow your protea seeds. Here are the steps:
- In a tray, place a thick layer of your propagation media and water it, ensuring that the entire mix is moist.
- Set a little bit of the propagation media aside.
- Spread your pre-treated protea seeds evenly over the propagation media.
- Sprinkle a thin layer of the propagation media over the seeds, ensuring that they are covered.
- Water the entire tray, and if you notice some seeds getting exposed, add more of the propagation media to cover them.
- After sowing the seeds, place the tray in a warm area, protected from rain and wind.
- Check from time to time to ensure that the propagation media is evenly moist. Depending on how quickly the media dries out, you may have to water the seeds at least once a week.
Pricking Out Your Protea Seedlings
Once your protea seedlings are around 5 cm tall, you can prick them out. If you sowed your seeds between March and May, you’ll likely be able to prick the seedlings by September to November.
When pricking out the seedlings, do so gently to avoid damaging the roots. To be safe, use a fork to pry each seedling from the propagation media.
After pricking out a seedling, you can move it into an individual pot. We’ll have a deep dive into growing proteas in pots later on, but generally, you can move a plant to your garden soil once it starts to reshoot after pruning.
Growing Proteas in Pots
If you don’t have a big garden or you live in an apartment, consider growing protea plants in pots. What’s great about this shrub is that it can thrive even in the smallest spaces as long as it has the right growing conditions.
Growing proteas in pots can be the ideal option for many gardeners, including:
- Those Living in Apartments or Renting: Because potted proteas are low maintenance and portable, you can easily move them around and choose any sun-soaked area.
- Those Gardening in Courtyards: Even in tight courtyard spaces, you can have proteas in containers and enjoy a spectacular display of these Australian native plants.
- Those in the Beginning Stages of Their Gardening Journey: You can build gardening confidence and learn a lot about plant care by starting with one potted protea plant.
- Those Interested in Design: Because potted proteas are dramatic and eye-catching, they can easily add flair to your balcony or small outdoor space.
- Those Collecting Plants: Because you’re growing proteas in pots, you can easily plant multiple varieties at once.
Why Growing Proteas Can Be a Great Choice
Since you’re taking care of proteas in containers, you have more control over their growing conditions. For one, the portability means that you can easily move each plant to any location, protecting them from extreme weather. Moreover, since their growing space is limited, you can expect your potted proteas to stay compact. At the same time, it’s easier to manage the flow of air and water in pots than in garden beds.
Choosing the Pot for Growing Proteas
To start, you can use a 20 cm-wide plastic nursery pot. As your protea plant grows, you will move to a bigger pot incrementally. In general, proteas would need a bigger pot every year to allow their roots to expand while ensuring enough drainage.
As the protea matures, you’ll need a pot that’s around 40 to 50 cm wide. To protect the plant from overheating or too much sun exposure, you can also place it in a bigger, decorative outer pot. By using a double-pot approach, it will be easier to keep a consistent level of moisture. At the same time, refreshing the mix would be more convenient.
Selecting the Potting Mix for Your Proteas
Similar to planting your proteas in the garden, growing this shrub in a pot also requires free-draining soil that’s low in phosphorus. Note that blends with moisture retention properties and general-purpose potting mixes tend to keep excess water around a plant’s roots, so avoid them.
To improve the drainage and structure of your potting mix, you can add fine gravel, pine bark fines, perlite, or even coarse sand. With these materials, you can create a potting mix that resembles the free-draining soils in the environment that proteas naturally thrive in.
If you bought a more compacted or heavier mix, you can break it up by adding a small amount of gypsum. To keep the roots healthy, encourage strong foliage growth, and help your proteas produce brightly coloured flowers, you can add iron sulphate or iron chelate to the mix every year.
Choosing the Spot for Your Potted Protea
As mentioned, proteas are a hardy plant that thrives under the full sun. So, make sure that the spot you choose for your potted plants gets around six to eight hours of direct sunlight every day. Also, note that with the changing seasons, sun exposure in that area may also change.
Therefore, move your pot whenever necessary throughout the year to ensure that your protea gets enough sun.
Tips for Mulching Your Potted Proteas
Even if you’re ditching garden beds for containers, you shouldn’t forget to add mulch to your proteas. With a good layer, you can keep the weeds at bay while neutralising extreme temperatures and retaining moisture.
To mulch your potted proteas, follow these steps:
- Collect coarse mulch materials like leaf litter, wood chips, and pine bark. Choosing these materials will protect the surface while allowing the water to pass through easily.
- Add about 3 to 5 cm of the mulch to the plant while avoiding its crown or stem to prevent rot.
Feeding and Watering Guide for Growing Proteas in Pots
The ideal process for watering and feeding proteas in containers is slightly different from the approach used for growing them directly from the ground:
Testing Your Potting Mix Every Year
You need to check the condition of your potting mix at least once a year. When the mix has become waterlogged, excessively dry, or compacted, refresh it with new additives and mix to ensure that the roots are kept healthy.
Watering Your Potted Proteas
Compared to proteas planted in garden beds, potted proteas need to be watered more frequently. However, you should avoid drowning the plant. Also, when the weather becomes warmer, make sure to water the pots each day to prevent the mix from getting too dry.
You can also touch the soil, and if you think that a few centimetres of the top are dry, you can water the plant. Also, make sure that the tray or saucer doesn’t hold excess water that can drown the roots.
Fertilising for the Flowers
Towards the end of the cooler months, add a slow-release fertiliser to your proteas. During the growing season, supplement the fertiliser with a monthly seaweed solution. To ensure that your blooms will become resilient and that you’ll have an abundant foliage, add an iron supplement each year.
Long-Term Care Tips for Your Potted Proteas
To ensure optimal health for your potted proteas in the long run, follow these tips:
- Rotate the Pot: As mentioned, the direction of the sunlight changes as we move through different seasons. So, remember to move or rotate your pot to ensure that the plant will be exposed to the full sun throughout the year.
- Prune Regularly: Even if your potted proteas are generally compact, they’ll still need pruning to maintain the exact shape and size that you prefer. As long as you control their form, you don’t have to worry about them outgrowing your space. Also, remember to prune right after flowering to encourage your proteas to produce more blooms the following year.
- Repot Every Year: To keep the roots from getting congested and refresh the soil, make sure to repot your proteas at least once a year.
- Ensure Proper Drainage: Make sure that the drainage holes are not blocked.
- Prevent Diseases: Lower the risks of diseases for your proteas by cleaning pots and gardening tools.
FAQs About Growing Proteas
Are proteas easy to grow?
In general, proteas are shrubs that are easy to grow. What’s more, they’re considered low maintenance once they’re established. As long as you get the soil and watering right while ensuring that they get as much sun exposure as possible, they can easily thrive in your garden. Even during the hotter months, an established protea can tolerate drought. While they’re vulnerable to certain diseases in wet environments, they can be resilient in the right conditions.
How long does it take for a protea to flower?
Depending on the protea variety you’re growing, the shrub may take three to six years to start producing flowers. However, some varieties, particularly king protea, may take even longer to begin blooming. So, you’ll need patience and consistency in caring for the plant before you see results. Also, once your protea is established, make sure to prune the flowered stems to ensure that the plant produces more blooms in the future.
Do Proteas need a lot of water?
Since proteas are drought-tolerant, they don’t need a lot of water, especially once they’re established. However, during the earlier stages of the plant, you shouldn’t let its roots dry out, which means you have to religiously water your protea at least once a week. At the same time, it’s crucial to have well-draining soil to ensure that the plant won’t be waterlogged, as that can cause root rot.
Why do my proteas keep dying?
There are various reasons why proteas die, and the most common cause is overwatering or poor soil drainage. When these two issues come together, they can cause root rot on the protea. Another reason why proteas die is because of excessive phosphorus in the soil or fertiliser.
This is also the reason why you should ensure that you didn’t apply phosphorus to the garden bed area you choose for your proteas. Other less-common culprits are alkaline soil, heat stress, and alkaline soil.
What is the lifespan of a protea plant?
Most protea varieties can live over ten years. However, some proteas, specifically king protea, can live for several decades when properly taken care of. Ultimately, your protea’s lifespan will depend on the soil you use, the care you provide, and how well it adapts to the environment you choose.
Can you put protea cuttings straight into soil?
Yes, you can put protea cuttings directly into soil, but make sure that it’s combined with the appropriate propagation media. Cuttings usually need a mix of vermiculite, peat moss, and horticultural sand to ensure that they will take root. Also, before you put them into the soil, make sure to dip them in rooting hormone. If you simply stick the cuttings in unconditioned, heavy, and overly moist soil, they can still take root, but there’s a high risk of rot.
Bring These Native Beauties Home
Whether you’re growing proteas in pots or in your garden bed, they can easily add life to your space. What’s more, they look as lovely as cut flowers, and they last long too. Because they have rigid stems and resilient bracts, they will look great in a vase for weeks.
If you don’t have the patience to wait for ten years before your proteas bloom, you can always turn to Flowers Across Sydney and get your statement blooms. From rustic native bouquets to modern floral arrangements, our proteas can command attention.
Browse through our native flower arrangements today and discover how proteas can add striking beauty to your space.
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