Canna (canna lily) is a tropical, rhizome-forming perennial with banana-like leaves and bold red, orange, yellow or pink flowers from summer into autumn. It suits Sydney gardens in full sun with plenty of water, where it makes a bold feature in borders, pots and wet spots.
This guide covers canna types, planting, feeding, pruning and problems, and it explains what people mean by canna nutrients in Australia.
Key points
- Most canna plants reach about 0.6 to 2 m tall and 0.5 to 1 m wide (indicative — check the plant label), so choose a variety that fits your space.
- They want full sun, rich soil and regular water, and they cope with wet or boggy spots better than most flowering plants.
- Maintenance is moderate: feed in spring, cut spent stems after flowering and divide the rhizomes every few years.
- Watch-out: canna can spread by rhizomes and self-seed, and frost burns the leaves, though the roots usually survive in Sydney.
Canna at a glance
| Feature | Detail |
|---|---|
| Botanical name | Canna indica and Canna x generalis hybrids |
| Plant type | Evergreen to semi-deciduous perennial grown from rhizomes |
| Mature size | About 0.6 to 2 m tall and 0.5 to 1 m wide (indicative — check the plant label) |
| Sun | Full sun; tolerates light afternoon shade |
| Soil | Rich, moist, well-drained or boggy soil with plenty of compost |
| Water | High in summer; tolerates wet feet |
| Frost tolerance | Foliage burns in frost; rhizomes usually shoot again in spring |
| Flowering season | Summer to autumn (indicative — check the plant label) |
| Native? | No, it comes from tropical and subtropical America |
Types of canna and canna lily varieties
Nurseries sell canna by flower colour and leaf colour, from green leaves to bronze and striped forms.
| Type | Size | Best use | Notes |
|---|---|---|---|
| Green-leaf canna with red flowers | About 1 to 1.5 m (indicative — check the plant label) | Borders and screens | Classic form; reliable and fast growing |
| Bronze or purple-leaf canna | About 1 to 2 m (indicative — check the plant label) | Feature planting | Dark foliage contrasts with red and orange flowers |
| Striped or variegated canna | About 1 to 1.5 m (indicative — check the plant label) | Pots and ponds | Showy leaves; may need more water |
| Yellow and orange canna | About 1 to 1.5 m (indicative — check the plant label) | Tropical-style beds | Bright flowers that suit warm, sunny spots |
| Dwarf canna | About 0.6 to 0.9 m (indicative — check the plant label) | Pots and small gardens | Compact; good for courtyards |
| Edible canna (Canna edulis) | Up to about 2 m (indicative — check the plant label) | Large beds, screens | Positively identify before eating any part; not recommended without expert advice |
Where to plant canna in Sydney
- Choose a sunny spot with at least six hours of direct sun, because shade reduces flowering and makes the stems lean.
- Space rhizomes about 40 to 60 cm apart (indicative — check the plant label) so the clumps fill out without crowding.
- Western Sydney clay suits canna well when you add compost, because the soil holds moisture that the plant loves.
- Sandy Northern Beaches soil dries fast, so mix in compost and mulch heavily to keep the roots moist.
- Grow dwarf canna in large pots with drainage holes, and move them to a sheltered spot in cold winters.
- Plant away from drains and pipes, and edge clumps with a barrier if you want to stop rhizomes creeping into lawn.
How to plant canna
- Plant rhizomes in spring, once the soil has warmed and the risk of frost has passed.
- Dig the bed over to the depth of a spade and mix in plenty of compost.
- Set each rhizome horizontally about 5 to 10 cm deep (indicative — check the plant label), with the growing tips facing up.
- Backfill, firm gently and water thoroughly to settle the soil around the rhizome.
- Mulch with a layer of organic mulch, keeping it clear of the emerging shoots.
- Water deeply and often through summer, using a hand-held hose with an instant on-off trigger nozzle, and water before 10 am or after 4 pm.
- Stake tall varieties if wind is a problem, and tie loosely with soft ties.
Caring for canna
Canna grows fast when it has food and water, and a clump beside a downpipe or wet corner often outperforms one in a dry bed.
| Task | When | How |
|---|---|---|
| Watering | Spring to autumn | Keep the soil moist and water deeply in hot weather, within Sydney Water’s Water Wise Guidelines; ease off in winter. |
| Feeding | Spring and early summer | Use a slow-release fertiliser registered for flowering plants and follow the label exactly. |
| Mulching | Spring | Spread organic mulch to hold moisture and suppress weeds. |
| Deadheading | Summer to autumn | Cut spent flower stems back to the base to encourage new spikes. |
| Cutting back | Late winter | Remove frost-burnt or tired stems to ground level before new growth starts. |
| Pest and disease watch | Spring to autumn | Look for leaf-rolling caterpillars and rust; for infestations, see a pest controller. |
Canna nutrients in Australia: what to feed canna
Canna is also the name of a hydroponic nutrient brand, which is why searches for canna nutrients in Australia often show indoor growing products. Garden canna lilies do not need those products.
- Use a general slow-release garden fertiliser registered for flowering plants, and follow the label for the rate and watering in.
- Choose products from Australian brands such as Yates, Scotts, Seasol or Searles, which you can buy at Bunnings and nurseries.
- Feed in spring and again in early summer, then stop feeding as the plants slow in autumn.
- Never mix products or add extras, and wear gloves and any protective gear the label lists.
- Keep children and pets off fertilised beds until the label says it is safe, and keep runoff out of drains and waterways.
- If you grow canna in a hydroponic or indoor system, follow the manufacturer’s instructions and local regulations for those products.
Cutting back and dividing canna
Canna clumps thicken each year, and regular tidying keeps them flowering.
- Cut flower stems to the base after flowering, using clean, sharp secateurs.
- Remove frost-burnt leaves in late winter and put them in the green waste bin.
- Lift and divide clumps every few years in early spring, keeping a growing eye on each piece.
- Replant divisions straight away at the same depth and water well.
- Wear gloves and closed shoes, and take care with a spade when lifting heavy clumps.
- Control spreading rhizomes by trimming clump edges each spring.
Common canna problems
| Symptom | Likely cause | Fix |
|---|---|---|
| Yellow leaves | Nutrient deficiency or waterlogged pots | Feed with a registered fertiliser and check drainage in pots. |
| No flowers | Too much shade or too little feeding | Move to full sun and feed in spring following the label. |
| Chewed, rolled leaves | Leaf-rolling caterpillars | Remove affected leaves; for infestations, see a pest controller. |
| Brown leaf edges | Dry soil or hot wind | Mulch and water more often. |
| Rust spots on leaves | Humid weather and fungal disease | Remove affected leaves and improve air flow. |
| Clumps spreading into lawn | Vigorous rhizomes | Divide and trim each spring and install an edge. |
FAQ: canna questions
What are canna nutrients in Australia?
Canna is a hydroponic nutrient brand sold in Australia, aimed at indoor and soilless growing. For canna lilies in garden beds, you do not need it. A general slow-release fertiliser for flowering plants, used exactly as the label directs, is enough for most Sydney gardens.
When do canna lilies flower in Sydney?
Canna lilies flower from summer into autumn in Sydney. Feed in spring, keep them well watered and deadhead spent stems to encourage more flower spikes. Plants in shade flower less, so choose a sunny spot for the best display.
Does canna come back every year?
Yes. Canna regrows from its rhizomes each spring. Frost burns the leaves in colder suburbs, but the roots usually survive. Cut the damaged stems to the ground in late winter, mulch the clump and wait for new shoots as the weather warms.
Is canna a weed?
Some canna types spread by rhizomes and seed, and can escape into bushland and waterways. Ask your nursery about well-behaved garden hybrids, keep clumps trimmed and never dump green waste in bushland. Check your council’s weed guidance if you live near a creek.
Next step: keep your garden beds in shape
If you would rather hand over the dividing, mulching and tidy-ups, we can help. Sydney gardeners typically charge about $52 to $115 per hour (October 2026), and a half-day garden clean-up costs about $170 to $460. Read our types of flower overview for more ideas, or request a garden maintenance quote.
