Time to Reconsider Coleus

Guest Post by Robert Wilson

The Case for Native Australian Species in Garden Design.

Love them or hate them, whether they are Coleus or Plectranthus, whether they feel nostalgic or a little bit "Granny garden", it’s time to take a fresh look at this diverse and under-appreciated genus.

Coleus has a broad distribution across Tropical and Sub-tropical regions of the world, but a special mention should be made for the charm, toughness, tactility and interest of our little native species (more on those later).

Let’s start with the familiar face: Coleus scutellarioides, the Painted Nettle. Spread throughout South East Asia and parts of Northern Australia, this is the garden variety we love (or don’t). It’s loud, it’s loveable(!) and when you look for it, it’s everywhere! Dayglo colours, wild leaf patterns, velvet textures, exotic leaf shapes. There is a cultivar to suit every palette. They are fun to collect, easy to propagate, accessible on any budget, and forgiving under most conditions. Garish or kitsch? Or A bold, herbaceous infill plant that emphasizes tropical plants with almost year round colour and interest! A winner in Brisbane, tolerates a range of conditions but for best colour, plant in dappled light and prevent flowering by dead-heading regularly. A minor few display good foliage colour in full sun (one of these is pictured). They can be standardized, pruned hard, plaited, heeled and generally forced into horticultural submission. For cheap, impactful, full, fast growing, tolerant, tough and vibrant bedding displays; get a hold of some “Painted Nettle” today!

I want to make a bigger case, one that speaks further to scent, texture, and mood in our gardens.

Australia’s native Coleus/Plectranthus species are not only beautiful: they’re powerfully sensory, and critically underused. Unlike their bright exotic cousins, native Coleus don’t shout. They enhance the pomp and circumstance of their big brothers and sisters in the garden. They support bold colour (or enhance earthen tones), radiate scent, and invite touch. They offer subtle leaf shapes, aromatic foliage, ease of maintenance, and floral displays that surprise in the dappled light. These aren’t feature plants; they’re the glue in a planting design. A skilfully selected and beautifully designed frame will enhance any artwork. They deserve far more love.

Let’s explore a few that bring scent, tone, and tactility into the spotlight:

Coleus argentatus (Silver Coleus)

This soft, silvery shrub shimmers in the shade. The foliage has a suede-like feel that begs to be touched, and its tall spikes of white, mauve, or soft blue flowers make it a beautiful alternative to lavender, especially in subtropical beds where lavender may fail. It’s cooling, calming, and quietly luminous. With its bright foliage and reliability in lower light conditions- perfect for brightening a shady or dull corner of the garden!

Coleus graveolens (Bush Basil)

A plant of surprising depth. Thick, textured leaves with a bright lime green tone and a strong, resinous aroma, somewhere between basil, mint, and native herbs. The foliage feels almost succulent under the fingers, while its purple-blue flowers rise up on soft stems. It brings density, texture, and fragrance to native garden designs. Large, intricately veined leaves provide the perfect foil to bold native wildflowers such as Grevillea or Hibiscus.

Plectranthus nitidus EN (Nightcap Plectranthus)

A small, endangered rainforest species that absolutely glows in low light. Glossy green leaves with maroon undersides and stems, a crisply toothed margin, and elegant leaf venation make it one of the most beautiful bedding plants for shady areas. Its flowers are like tiny chandeliers, twinkling purple and white across the understory. Want to see it? Gold Coast Regional Botanic Gardens has it planted in sweeps and mounds beneath rainforest trees; an absolute masterclass in subtle beauty.

Coleus bellus Rare (Coleus “Mount Carbine”)

Tall, tactile, and bursting with lemon-sherbet scent. Its velvety leaves carry a rich citrus aroma that releases as you brush past. This is a plant for people who understand gardens as spaces to feel as well as look. It makes a fantastic sensory border, cut it back hard, enjoy the soft flushes of new growth, and let it do the work lambs ears can’t do in the tropics and sub-tropics. Or let it standardise for a quivering display of electric green texture in the back of a bed. While not a showy flowerer, C. bellus sports a delightful and reliable sky blue flower.

Coleus alloplectus EN (Slenderleaf Hullwort)

This is my favourite; tough, bronzed, and full of personality. Its new growth bursts in tones of gold, copper and bronze, it sets the stage for bold spikes of purple flowers. It thrives under pressure, responds beautifully to pruning, and pairs exquisitely with native garden design tones: olive, parchment, drab, stone, silver and dun. It’s a complementary gem with year-round interest.

The Native Garden: A Balanced Approach

With the ongoing discussions about some exotic species becoming problematic in parts of Australia, I felt it was time to reveal that while I love native plants, I also have a deep appreciation for many exotic species and believe they can coexist harmoniously.

The Native Plant Misconception

It’s important to recognise that just because a plant is native doesn’t mean it won’t become a weed. Take the Cootamundra Wattle (Acacia baileyana) as an example. This beautiful, fast-growing acacia is naturally restricted to the South Western Slopes of New South Wales. When planted in higher rainfall areas, it can aggressively invade surrounding bushland, self-seed, and become a nuisance. 

Another misconception about native plants is that they require little to no maintenance. A native garden, like any other garden, requires effort. This includes:

• Soil Cultivation: Regularly improving soil with compost and organic mulch.

• Fertilising: Using products like Organic Link at the start of each season and supplementing with regular liquid fertilising.

• Maintenance: Trimming and replacing plants as weather conditions change.

Responsibility

People must start to take responsibility for our plants and gardens. For instance, Syngoniums, a popular houseplant, are classified as weeds. Do we stop cultivating this plant, or do we educate and ensure responsible care and correct disposal, if needed? As a professional horticulturalist, I explain the potential pitfalls and dangers of allowing such plants into the wild. I expect their new owners to trim and care for them to prevent them from becoming out of control. I expect people to allow themselves to be educated and take on that advice. You cannot buy a climber and then get upset when it climbs.

Choosing the Right Plants

• Reputable Sources: I only purchase plants from reputable sellers. For example, seed-grown vinca (which I do not sell) can be a weed, but with modern horticultural advancements, sterilised vinca won’t usually last longer than 6-12 months (this is what I stock).

• Local Availability: Many Southeast Queensland natives are not commercially available because they are hard to cultivate in large numbers or aren’t as visually appealing as their Western Australian counterparts. Thus, a native garden in Ipswich might consist of 20 Western Australian and South Australian natives and only a couple of Southeast Queensland natives.

Genetic Dilution in Local Australian Plants

Genetic dilution refers to the weakening or loss of genetic diversity in local native plant populations due to cross-breeding with introduced species from other areas or non-native species. This can lead to several ecological and evolutionary problems, including reduced adaptability to local conditions and the loss of unique genetic traits.

An example of this happening is with the Australian native Corymbia torelliana, commonly known as Cadaghi. It is native to northern Queensland, Australia, and has been widely planted outside its native range due to its fast growth, aesthetic appeal, and usefulness in timber production.

Corymbia torelliana can hybridise with closely related species, such as other Corymbia species and some Eucalyptus species. When this occurs, the genetic material of Corymbia torelliana mixes with that of the native species, resulting in hybrid offspring. These hybrid offspring may exhibit reduced fitness compared to pure native species, including traits such as lower resistance to local pests and diseases, or reduced adaptability to local soil and climate conditions.

The genetic dilution of native species can also lead to a reduction in biodiversity, potentially disrupting ecosystem functions such as nutrient cycling, water regulation, and habitat and food provision for other species.

Corymbia torelliana produces a large amount of pollen, which can be dispersed over long distances by wind or pollinators like bees. This increases the likelihood of cross-pollination with native species over longer distances. Just one tree can affect a very large area.

The Role of Exotic Plants

Native and European plants can be used together. Many fruit trees and vegetables aren't native, but that doesn't mean we should stop growing them. Many herbs, like garden mint, and comfrey, can become weeds, yet we don’t stop cultivating them. Instead, we focus on education and responsibility.

I have personally found Camellia sasanqua flowers and bacopa (both exotic) are a preferred flower for my native bees.  Lemon Balm (Melissa officinalis) was traditionally used by the ancient bee keepers. They used to rub the crushed leaves on the beehives to encourage the domesticated bees to return to their hives. They also believed that the lemon balm would also bring new bees to the hive.

Creating a garden, whether it be native or a combination, requires thoughtful planning and effort, but the results are worth it. By understanding the specific needs of our environment and taking responsibility for our plant choices, we can create beautiful, sustainable gardens that celebrate both native and exotic species. Let’s continue to educate ourselves and others while embracing the diversity that makes our gardens thrive.

Native Cottage Garden

Recently a customer asked me to help her design a native cottage garden.

She had watched an episode of Gardening Australia where they had made a beautiful cottage garden using only Australian native plants.

The problem was this list, like many native plant lists, had native plants that grew better in dry sandy soils not natives that can handle humidity, drought, frosts, black heavy clay soils .... all the things Ipswich can throw at a plant, sometimes at once!

Accepting the challenge, I set out to create a new list of native plants that thrive in Ipswich's variable climate and soils. Special thanks to The Mountain Man for his extensive knowledge of native plants; his input was invaluable in compiling this list.

This list is meant to inspire and demonstrate that anything is possible. It is not exhaustive but serves as a guideline. If it were my garden, I’d incorporate a variety of plants including grasses, groundcovers, shrubs, and flowering annuals. I would also plant trees to provide shade and create spaces for epiphytic plants like orchids and air plants.

Soil improvement would be ongoing, with compost and organic mulch, and I would fertilise with Organic Link at the start of each season, supplemented by regular liquid fertilising. A maintenance program would be essential for trimming and replacing plants as weather conditions change. A native garden still requires care, including fertilising and maintenance.

Australia's diversity means that just because a plant is native doesn’t necessarily make it suitable for every garden, soil, or climate. It's crucial to select the right plants for your specific conditions.

Cottage Garden using Australian Native Plants

Native Large Leaf Tamarind - Edible

Diploglottis australis.

I love saying this Australian Native’s botanical name. It has such flow and yet the weirdest set of letters together.

Say it slowly the first time helps

Dip..lo..glot..tis Aus..tral..is

This beautiful plant is commonly called Native Large Leaf Tamarind.

In its natural habitat, along east coast of Australia anywhere from Proserpine (QLD) to Brogo (NSW), it can grow to over 35m tall. In cultivation, our backyards, it’s mainly used as a large shade tree. In best conditions it will usually grow to about 10m high and 3-5m wide.

There are so many things to love about this tree but honestly the thing I love the most is it’s leaves. I love trees with large leaves and this one has these large leaves that are covered in velvety golden brown hairs. Adding a bronzing effect to the overall greenness of the tree. Added to that the leaf veins are easy to see and the midrib is slightly raised. It’s truly a visual and textural leaf.

Not only does it have these amazing leaves it also has the coolest fruit!

The flowers are like hairy creamy white puffs that form in the Spring. Then from about January fruit starts to drop to ground when ripe. The berries, are two or three-lobed and are roughly about the size of a small fig fruit. They have a brown hairy outer casing and contain juicy, orange/red, edible pulp around a large brown seed.

The fruit is often sour to taste, but like the Asian Tamarind, may be enjoyed raw or processed into jams, jellies, sauces and drinks. It’s a great native food.

Diploglottis australis can be grown in full sun or part shade. It doesn’t like frosts or windy positions. It does prefer to have moist fertile soil but beggars can’t be choosers and can grow in a wide range of soils and conditions.

A good feed with a complete slow release organic fertiliser, like Organic Link, every three months would be greatly appreciated.

Diploglottis australis is a beautiful small native tree that would be an added bonus to any garden.

Native Daisy

Brachyscome multifida is endemic to Australia and a brilliant free flowering hardy ground cover daisy.

This cute little daisy has fine feathery foliage and can grow to about 50cm diameter and about 40cm high.

It prefers full sun in good quality free draining soil. The flowers usually appear from mid winter until summer but they can spot flower continuously if conditions are right. The flowers are usually shades of pinks and purples.

They don’t mind the cold or a little bit of dry but do need a top up water.

Fertilise then seasonally with a good quality complete organic fertiliser like Organic Link. They also appreciate a liquid fertilise with Triple Boost to keep them powering on.

I think these guys make great fillers in gardens and work like a living mulch. I also have seen them tumbling out of urns and as hanging basket specimens for full sun areas.

I think these guys are really cute and would work well in a cottage or formal landscape. Sometimes we all need a daisy in our lives.

Native Basil

Today I have one you all probably know but maybe you are a bit like me and didn’t know it was a native!

Coleus graveolens, synonym Plectranthus graveolens

Commonly called Bush Basil or the Five Spice Herb!

This plant is native from Cape York all way down to NSW.

Bush Basil is a very strong herb and is said best to use with Mediterranean flavours like tomato and garlic. You could use fresh leaves on a pizza or blend for a pesto.

It also has many medicinal qualities and can be steeped into a tea to help with coughs and colds.

It’s a vigorous growing herb and can handle full sun or shade and will grow in pots or the garden. It doesn’t mind the heat, dry or cold once established.

It gets covered in pretty mauve flower stalks in the warmer months. These are great as cut flowers and if you cut the leaves off with the flowers it will work as an aromatic bunch of flowers. Scenting the house nicely. The flowers also attract all different types of beneficial insects.

It can get to about 1.5m tall if let go but I find it’s best to trim after flowering otherwise it can get rather scraggly.

As with all my natives I would be fertilising my bush Basil with an organic complete slow release fertiliser like Organic Link every three months.

Native Ground Cover

The Fanfare range of groundcovers is a must have for your native garden.

Scaevolas are a hardy, low growing plant with lush green foliage all year long. They have striking fan-shaped flowers that cover the bush for most of the year. You can get them in a range of colours - blue, pink, white and yellow.

This Australian native is heat & drought tolerant and has a trailing and cascading habit making them a great choice for hanging baskets, underplanting under trees in gardens, cascading over retaining walls, in large pots as a glorious spiller as well as being just a great plant for the garden.

Scaevolas suit all style gardens from native gardens to tropical and even cottage gardens.

It seems to handle the cold (not heavy frosts), wind and the heat. It loves free draining soils and hates wet feet. Mulch well and keep slightly dry in summer as it hates humidity. As Scaevolas never stop flowering I find giving them small tip prunes regularly and liquid fertilising with Triple Boost every fortnight keeps them looking fantastic.

While Scaevolas love the sun they can handle a little bit of shade.

Even the bees and butterflies love it!

Leptospermums - Spoilt for Choice

Love our native Tea Trees, Leptospermums?

Here a a few cultivars to fill your garden with.

Leptospermum obovacum 'Starry Night' 

Leptospermum obovacum 'Starry Night'

This glorious Leptospermum has shiny black-purple foliage... I know you are already sold but when it's dripping in white starry flowers you may actually think it really is a Starry Night!!!!

All the wildlife will love you too as the flowers are laden with pollen

This easy to grow, exceptionally hardy Australian native is happy in full sun to light shade. It can handle most soils and once established will handle a little dry and a light frost. It will get to around 2m High x 1.5m Wide. I would trim and shape from an early age if a tight screen was needed. Trim after flowering.

I would fertilise every three months with Organic Link fertiliser and plant into excellent quality garden soil.

Trevallan's have not started to flower yet as this Leptospermum flowers late spring summer. This picture is from Austraflora 's website. The breeders of this beautiful plant.

Leptospermum Purple Haze (Leptospermum scoparium). 

Leptospermum Purple Haze (Leptospermum scoparium).

This Leptospermum has pretty pinky/purple flowers in spring that cover the entire Bush. The mass of flowers attracts nectar feeding insects, birds and other wildlife.

I like this Leptospermum mainly though because it’s leaves are a little different to other Leptospermums, they are kind of small, fat and glossy.

This is a great small to medium shrub that can be used a feature plant in pots or gardens but would also be perfectly suited to form a small low hedge.

It grows naturally to around 1.5ms tall. This plant doesn’t need to be trimmed but like most Leptospermums looks better after a haircut. Leptospermums can handle a range of soil types and once established don’t mind the cold, heat or the dry. I like to give all my natives a good feed with Organic Link (a complete organic slow release fertiliser) about once every three months.

Leptospermum scoparium ‘Burgundy Queen’

While all Leptospermums are beautiful my favourite and the one I’d have in my garden is the Leptospermum scoparium ‘Burgundy Queen’.

I think at first it was the deep burgundy almost black foliage but It’s majestic upright growth habit also took my breath away.

Then I found out it flowered profusely with intense dark burgundy double flowers. I was blown away. Plus it has the most adorable black eyes inside the flowers.

Seriously how could you not fall in love.

I honestly think it looks best kept trimmed to around 1.5m but this plant can easily grow untouched to about 3m

I could imagine it in a pot surrounded by the soft delicate Sweet Alyssum or in a dry landscape garden as a hedge.

Leptospermums can handle a range of soil types and once established don’t mind the cold, heat or the dry. I like to give all my natives a good feed with Organic Link (a complete organic slow release fertiliser) about once every three months.

Like most Leptospermums ‘Burgundy Queen’ is great at attracting wildlife when it’s in flower and is also an amazing cut flower.

Seriously I think we all need these beauties in our life.

Leptospermums - Aussie Blossom Range

Naoka Leptospermum

I always get asked for Geraldton Wax. While we do sometimes stock this beautiful native I believe the Leptospermum cultivars, our native Tea Trees, do a lot better here in Ipswich.

I like to refer to our native tea trees as the Australian Cherry Blossom

The Leptospermums that reflect this name the best is the Aussie Blossom Range.

The Aussie Blossom Range is a beautiful range of Leptospermums that have masses of stunning flowers in a range of pink shades that cover the bush for about 8-10 weeks in winter and early spring.

The range has been bred for easy care, compact growth and brilliant flowers and there are a few within the range to choose from

• Alicia Rose pbr (rose coloured flowers)

• Emily Nao pbr (pink coloured flowers)

• Joy pbr (dusty pink flowers)

• Martin pbr (dusty white flowers)

• Naoka pbr (pink with ruby red centre)

• Stephen Rose pbr (white with pink centre)

You could mass plant any of these beauties to create an informal low hedge (grow to about 1.5m) or you could create a stunning masterpiece in your garden with just one.

While you don’t NEED to trim these guys I always find they grow and look better after a hair cut. I like to do it after they finish flowering.

Joy Leptospermum

While some people are under the impression natives don’t need fertiliser this is not true. All plants need fertiliser. I like to say it’s the difference between survive and thrive.

I like to give all my natives a good feed with Organic Link (a complete organic slow release fertiliser) about once every three months and a liquid fertilise with Triple Boost about once a fortnight.

This is a beautiful range of plants and I think at least one should be a part of any garden design. They even work wonderfully for cut flower displays.

Backhousia citriodora

One of my all time favourite scented foliage plants is the Backhousia citriodora (lemon myrtle).

It is endemic to subtropical rainforests of central and south-eastern Queensland, Australia, with a natural distribution from Mackay to Brisbane.

Unfortunately the lemon myrtle was very hard hit by the myrtle rust and the commercial availability of the smaller plants became very limited. You see, Backhousia citriodoras don’t grow true to form from seed, cutting grown is always best but Backhousias are notoriously hard to grow from cutting. Understand now why there can be a shortage some years! Older established trees are readily available and now the smaller ones are slowly coming back on the market.

Lemon Myrtle (Backhousia citriodora) is an absolute delight for any garden. It is a small growing tree (around 3-5m) with leaves that release a strong lemon scent when crushed or after rain. I love breaking off a few and throwing them on the lawn before I mow. It makes mowing so much more enjoyable!

New growth is tinged red and in summer you’ll get abundant clusters of creamy white flowers which are loved by butterflies and bees.

Lemon myrtle is quite versatile and can be used as a screen, hedge or feature tree and is suitable for most gardens and courtyards. It loves the full sun and can handle the cold and dry once established. It is naturally thick and dense and doesn't require trimming to keep it neat.

A good fertilise with Organic Link on turn of every season would be appreciated by the tree.

Long, hot day calls for an icy mineral water (maybe with a splash of vodka) and some Backhousia citriodora leaves for a great tang.

The leaves, flowers and seeds of lemon myrtle are all edible and can be used in cooking to flavour biscuits, cakes, bread, pasta, meat and herbal teas. It can be also use to scent your own soaps or bath bombs.

Lemon Myrtle essential oil is also available. It has an intense lemony aroma which is uplifting and invigorating and is great to use when studying or just needing a gentle nudge into the fast track of the day.

One of my all time favourite natives. Trevallan always tries to have these amazing natives in stock

Macadamia tetraphylla

Did you know that Macadamia tetraphylla was the first Australian native food plant to be grown by non-indigenous Australians as a commercial crop?

What’s even cooler is that seedlings from this original plantation were used as rootstock for grafted modern varieties of Macadamia Nuts well into the 20th century.

Macadamia tetraphylla from Royal Botanical Garden in Sydney

In recent times commercial growers have stopped growing Macadamia tetraphylla and preferred to grow Macadamia integrifolia (Macadamia Nut most of us know and love). The reason for this is the Macadamia tetraphylla has a higher sugar content than Macadamia integrifolia. Having a higher sugar content makes it really yummy when eaten raw but can lead to burning when used in baking.

Macadamia tetraphylla is native to southern Queensland and northern New South Wales and is now classed as a vulnerable in the wild.

Macadamia tetraphylla has long, pendulous nectar rich pink flowers that the insects and birds adore. They also have a delicious scent. After the flowers woody, rounded fruits appear which contain the edible seeds.

It can grow to 18m in best conditions but can be kept smaller. It is best suited for people who have space and is an excellent shade tree.

These trees are best growing in the ground. Best planting advice is dig your hole twice as big as your pot. Back fill with excellent quality garden soil and plant your tree, fertilise with Organic Link when planting. I like to fertilise all my natives on turn of every season (every three months) with Organic Link. It usually takes around three months for a tree to fully establish itself. Keep water and liquid fertiliser up to your tree over this time and allow it to get the best possible start in life.

We have some of these beauties in stock now