BEGINNER’S GUIDE Beginner’s Guide to Growing Coleus Plants Brilliant colour, easy cuttings and plenty of personality—coleus is one of the most rewarding foliage plants a new gardener can grow.

Why coleus deserves a place in your garden

Coleus is grown for its leaves—and what leaves they are. Depending on the variety, they may be lime green, crimson, burgundy, copper, pink, cream or almost black, with splashes, veins, scallops and ruffled edges that can look hand-painted.

The plant most gardeners mean by coleus is Coleus scutellarioides. It belongs to the mint family, Lamiaceae, which helps explain its square stems and pairs of opposite leaves. It is a tropical, frost-tender perennial. In warm, frost-free conditions it may live for more than one season; in cooler districts it is commonly treated as an annual or protected indoors over winter.

1. Start with the right position

Light is the secret behind strong growth and rich leaf colour—but there is no single rule for every coleus. Modern varieties range from shade-loving plants to sun-tolerant selections.

For most varieties, bright filtered light or gentle morning sun with afternoon shade is a safe starting point.

In Brisbane and other hot climates, protect plants from harsh western afternoon sun, especially during summer heatwaves.

Too little light can produce stretched stems and duller colour. Too much intense sun may bleach or scorch the leaves.

Move a plant into stronger light gradually and let its leaves tell you how it is coping.

LEAF CLUE Crispy pale patches often point to sun scorch. Long gaps between leaves and a plant leaning toward the light suggest it needs a brighter position.

2. Choose soil that drains freely

Coleus enjoys fertile, moisture-retentive soil, but its roots still need air. In the garden, improve heavy ground with organic matter and avoid low spots that remain waterlogged. In containers, use a good-quality potting mix and a pot with open drainage holes.

Choose a pot only a little larger than the root ball when repotting. A very large volume of wet mix around a small root system can stay damp for too long.

3. Water well—not by the calendar

Check the soil rather than watering automatically. When the top few centimetres feel dry, water thoroughly until excess drains from the bottom. Empty saucers and decorative outer pots so the roots are not left standing in water.

Coleus leaves can droop dramatically when thirsty, particularly on hot or windy days. A plant that repeatedly collapses, however, is under stress. Containers, hanging baskets and newly planted coleus usually dry faster than established plants in the ground.

IMPORTANT Wilting does not always mean ‘add water’. If the mix is already wet, wilting may signal damaged or oxygen-starved roots. Feel the soil first.

. 4. Feed for steady, leafy growth

During active growth, use a balanced liquid fertiliser or a suitable controlled-release fertiliser according to the product label. Container plants need feeding more often than plants growing in improved garden soil because nutrients wash from pots over time.

More fertiliser is not better. Excess feeding can create soft, weak growth and may reduce the intensity of some leaf colours. If the plant is stressed by heat, dryness, pests or root problems, fix that issue before adding extra fertiliser.

5. Pinch for a fuller plant

Coleus naturally grows from its tips. Pinching just above a pair of leaves encourages the buds below the cut to branch, turning one tall stem into a bushier plant. Begin while the plant is young and repeat whenever it becomes lanky.

Flower spikes are not harmful. You can enjoy them, or remove them if your priority is compact growth and foliage. Once a plant becomes woody or untidy, take fresh cuttings and begin again—one of the great pleasures of growing coleus.

6. Make new plants from cuttings

Coleus is famously easy to propagate. Cut a healthy non-flowering stem just below a node—the point where a pair of leaves joins the stem. Remove the lower leaves, then place at least one bare node in water or in a clean, moist propagation mix.

Keep the cutting warm in bright, indirect light.

If rooting in water, refresh the water regularly and pot the cutting once it has a useful cluster of roots.

If rooting in mix, keep it lightly moist—not saturated—until new growth shows that roots are forming.

Named cultivars are best copied from cuttings. Seed-grown plants may not look exactly like the parent.

7. Watch for common problems

Faded, scorched or curling leaves

Check sun intensity, hot reflected heat, wind and watering. Sudden exposure to stronger sun is a common cause of bleaching or crisp patches.

Yellow leaves and wet soil

Improve drainage and allow the upper layer to dry before watering again. Remove water from saucers and check that drainage holes are not blocked.

Long, floppy stems

Provide brighter light if appropriate for the variety, rotate pots for even growth and pinch the tips above a leaf pair.

Pests

Inspect the undersides of leaves and the joints of stems. Coleus can be troubled by pests such as mealybugs, scale insects and whitefly; spider mites may also appear in hot, dry conditions. Isolate an affected potted plant, remove badly damaged growth and choose a treatment registered for that pest and safe for the plant. Follow the label exactly.

Seasonal care in Australia

In warm subtropical gardens, coleus may grow for much of the year but can slow during cool weather. Shelter it from cold wind and frost. In frost-prone areas, take cuttings before winter or move treasured potted plants to a warm, bright, protected position.

During hot, humid spells, keep air moving around crowded plants, water the soil rather than constantly wetting the foliage, and avoid leaving roots in stagnant water. After heavy rain, check pots and saucers promptly.

A beginner’s coleus checklist

Start with bright filtered light or morning sun.

Match stronger sun exposure to a sun-tolerant variety.

Use fertile, well-drained soil or quality potting mix.

Water deeply when the upper soil begins to dry.

Never leave the pot standing in water.

Feed sensibly during active growth.

Pinch above a pair of leaves for bushier growth.

Take cuttings of favourite plants before cold weather or decline.

Five fascinating coleus facts

It is part of the mint family. Square stems and opposite leaves are classic clues.

Its botanical name has travelled. You may see the same familiar ornamental coleus listed under Coleus, Plectranthus or Solenostemon in older books and plant labels.

The leaves are the main event. Breeders have selected coleus for extraordinary foliage colours, shapes and patterns rather than showy flowers.

Cuttings preserve a favourite. A stem cutting is a clone, so it is the dependable way to keep the same leaf pattern. Seedlings can surprise you.

‘Coleus likes shade’ is only half the story. Many newer cultivars tolerate considerable sun, while others still perform best with filtered light and protection from intense afternoon heat.

FINAL THOUGHT

Coleus is wonderfully forgiving. Observe the leaves, adjust one thing at a time, and take cuttings of the plants you love. Before long, one colourful pot has a habit of becoming a collection.

Fact-check sources

Royal Horticultural Society: Coleus scutellarioides plant profile and growing guidance — rhs.org.uk

Missouri Botanical Garden Plant Finder: Plectranthus scutellarioides — missouribotanicalgarden.org

Editorial note: cultivar tolerance, local microclimate and potting conditions vary. Always follow fertiliser and pest-control product labels.