Painted trillium
Trillium undulatum · Melanthiaceae
The gardener's calendar
Ideal time to plant painted trillium: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.
ID card
- Foliage
- Deciduous
- Blooming
- Spring (April-May)
- Adult size
- 30 to 50 cm in height
- Growth
- Slow
- Hardiness
- Excellent (zones 3 to 8)
- Origin
- Eastern North America
- Soil type
- Rich, moist, well-draining
Care
Light
Wavy trillium thrives in partial shade or under an airy forest canopy. Avoid intense direct sunlight, which dries out the foliage. Dappled light, like that found in a natural woodland, reproduces its optimal conditions.
Watering
Keep the soil moist but not waterlogged, especially during spring growth and dry periods. Consistent moisture promotes rhizome establishment. In winter, reduce watering.
Soil
Prefer soil rich in organic matter, slightly acidic to neutral. Incorporating well-decomposed compost or peat improves moisture retention. Adequate drainage prevents root rot.
Fertilizing
No fertilizer is needed if the soil is enriched with organic matter. A light application of compost in autumn supports nutrition for this plant, which tolerates poor soils.
Pruning and cutting
Allow the foliage to dry naturally in autumn. Don't cut green stems during the growing season—they feed the rhizomes. Remove dead parts once they've completely withered.
Diseases and pests
Wavy trillium is generally very robust in woodland settings. Rhizome rot can occur if drainage is insufficient. Check soil moisture and improve soil structure if necessary.
Did you know?
The wavy trillium gets its name 'undulatum' from the wavy petals of its white-pink flowers. Emblematic of North American deciduous forests, this discrete plant plays a key role in the forest ecosystem by serving as a food source for ants that disperse its seeds, which are equipped with nutritious elaiosomes.
Where to buy it
Plant in spring or early autumn, avoiding spells of intense heat. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, April, May, September.
Add this plant to my garden →Plants from the same family
- Herb parisParis quadrifolia
- False helleboreVeratrum album
- Great white trilliumTrillium grandiflorum
- Western trilliumTrillium ovatum
- False helleboreVeratrum viride
- Veratrum lobelianumVeratrum lobelianum
Tips generated and checked by Viridia — adapt them to your local climate.