Hellebores do the one thing almost nothing else manages: they flower generously, in shade, in the middle of an Australian winter. From late May through to September, when the rest of the garden has stopped, a mature clump throws up nodding cups in white, cream, plum, dusky pink or near-black above evergreen leathery foliage. They are long-lived, largely pest free and genuinely low maintenance, and the only real skill is picking the right position and cutting the old leaves off at the right moment.
Quick facts
| Detail | Hellebore, Helleborus hybrids |
|---|---|
| Mature size | 30cm to 45cm tall by 45cm to 60cm wide, forming a slowly expanding clump |
| Habit | Evergreen clumping perennial with leathery divided leaves |
| Position | Dappled or morning sun with afternoon shade; deciduous tree canopy is ideal |
| Soil | Rich, free draining, high in organic matter; tolerates neutral to slightly alkaline |
| Water | Moderate and even; never waterlogged, never bone dry through flowering |
| Climate zones | Cool and temperate Australia; struggles in humid lowland subtropics |
| Flowering | Late autumn to early spring, peaking June to August |
| Note | All parts are toxic if eaten and the sap can irritate skin; wear gloves when cutting |
Choosing the right hellebore
Nearly everything sold in Australia falls into two groups, and they behave differently enough that the choice is worth making deliberately.
Oriental hybrids
The classic Lenten rose types, sold as Helleborus x hybridus, are the garden workhorses: tough, seed-grown, endlessly variable in colour and very long lived. Molly's White is a good representative, with pale cream flowers marked green at the centre and a clean, upright habit. These are the ones to mass plant under deciduous trees.
Winter rose and Ice N' Roses types
Modern sterile hybrids bred for outward-facing flowers, a longer display and better heat tolerance. Cinnamon Snow opens white and ages to rose, Ice N' Roses Merlot carries deep wine-red cups on strong stems, Ice Breaker Max gives large clean whites, and Winter Ballet Katie is a compact pink suited to pots. Because they put no energy into seed, they hold their flowers for months rather than weeks and tolerate more sun than the old hybrids.
Companions
Hellebores look thin on their own. Underplant with Evergreen Giant liriope or dwarf mondo grass for a contrasting strappy texture, add clivia for orange flowers in the same shade, and use a Japanese maple overhead: it drops its leaves in winter to let light onto the hellebores exactly when they are flowering, then shades them through summer. Our guide to ground cover plants for shade has further options for the same bed.
How to plant
Plant in autumn, from March to May, so the clump settles before it flowers. Choose a position with morning sun and afternoon shade, or dappled light under a deciduous tree. Deep shade against a south wall works but reduces flower numbers.
Dig in a generous quantity of compost and aged manure, because hellebores are hungry feeders that reward rich soil, and make sure the bed drains. Set the crown level with the soil surface, never below it, since a buried crown rots. Space plants 40cm to 50cm apart for a solid drift. Water in well and mulch 50mm deep with a fine composted mulch or leaf litter, pulled back clear of the crown. In frost-prone districts the mulch also protects the shallow roots through the coldest weeks, and our list of frost tolerant plants for Australia covers what else will share the bed.
Ongoing care
Watering
Keep the soil evenly moist from autumn through the flowering season, which usually means a deep soak once a week in the absence of rain. Through summer dormancy they need much less, but never let an established clump dry out completely under a tree canopy, where competition for moisture is fierce. Our guide to adjusting watering in winter explains why cold, damp soil needs far less irrigation than instinct suggests.
Feeding
Apply aged manure or a complete slow-release fertiliser in early autumn as the flower buds form, and again lightly after flowering finishes in spring. A top-dressing of compost each year does more for a hellebore than anything from a bottle. They are one of the few shade perennials that appreciate lime on very acidic soils.
Pruning
There is only one job, and it matters. In late autumn, around May, cut every old leaf off at ground level before the flower stems emerge. This shows the flowers properly, removes the leaf-spot spores carried on old foliage, and lets light onto the crown. Wear gloves, as the sap irritates skin. After flowering, remove spent stems unless you want seedlings, which the oriental hybrids produce freely.
Common problems and fixes
Black or brown blotches on leaves. Hellebore leaf spot, a fungal disease spread from old foliage. The annual autumn leaf removal is the cure; bin the trimmings rather than composting them.
Flowers hidden under foliage. Old leaves left on. Cut them off in May and the display transforms.
Aphids clustered on flower stems. Common in mild winters. Hose them off or use a horticultural soap; they rarely cause lasting harm.
Black streaking and distorted growth. Hellebore black death, a virus with no cure. Dig out and dispose of affected plants immediately, and control aphids, which spread it.
Plants declining in a hot humid summer. The usual cause of failure in Brisbane and northern New South Wales. Grow them in pots in deep shade, or treat the choice as a short-lived seasonal display.
Frequently asked questions
Do hellebores grow in Australia's warmer states?
They are at their best in Melbourne, Adelaide, Canberra, Tasmania, the Southern Highlands, the Blue Mountains and the Granite Belt, and they perform well in cooler Sydney suburbs. In humid subtropical Brisbane they resent the wet summers and are usually grown in pots in deep shade where the mix can be kept free draining. The Ice N' Roses types are the most heat tolerant of the group.
When do hellebores flower?
Most begin in late autumn or early winter and peak from June through August, finishing in early spring. The Winter Rose and Ice N' Roses hybrids hold their flowers for three to four months because they set no seed, while the oriental hybrids give a shorter but very heavy display in mid to late winter.
Why is my hellebore not flowering?
The three usual causes are too much shade, a crown planted too deep, and a clump that is still too young. Hellebores often take two seasons to settle before flowering properly. Check the crown sits level with the soil, move the plant into morning sun if it is in dense shade, and feed with compost in autumn.
Are hellebores safe around pets and children?
No. Every part of the plant is toxic if eaten and the sap can irritate skin, so wear gloves when cutting foliage and site them away from areas where small children or pets dig. They are not a plant to avoid entirely, but they belong in a border rather than a play area.
How do I divide an established clump?
Divide in autumn every four or five years, once the clump is congested. Lift the whole plant, wash enough soil away to see the crown, and cut it into sections with at least three growth buds each using a clean sharp knife. Replant immediately at the same depth, water in well, and expect a reduced display for the first winter after division.
Ready to plant?
Browse the winter-flowering range in our plants for full shade collection, or see the wider flowering plants for colour selection if you are planting a whole winter bed. For a shrub layer behind them, our guide to camellia bushes covers the other great winter performer for shaded Australian gardens, and perennials for a cottage garden suggests companions for spring.
