Also known as Great White Trillium · Large White Trillium · Large-Flower Trillium
White Trillium (Trillium grandiflorum), Ontario's provincial flower, is a striking woodland perennial known for its large, elegant white flowers that mature to pink.
At-a-glance light, water, soil, and growing conditions from plant data
Partial to full shade
25% intensity
Prefers dappled shade under deciduous trees. Protect from harsh afternoon sun.
Keep soil consistently moist
50% intensity
Water deeply when top inch of soil is dry. Ensure good drainage.
Humus-rich, moist, well-drained
50% intensity
Cool to moderate
50% intensity
Prefers temperatures between 10°C and 24°C. Dormancy in winter is crucial.
Light feeding
25% intensity
Apply balanced organic fertilizer or compost in early spring. Avoid over-fertilization.
Safety information from plant toxicity data
| Attribute | Value |
|---|---|
| Toxic for humans | No 0/5 intensity |
| Toxic for pets | No 0/5 intensity |
Non-toxic
Key traits and growing stats from plant data
Watering, pruning, propagation, and repotting details from plant data
White Trilliums prefer consistently moist soil. Water deeply when the top inch of soil feels dry, especially during dry spells. Avoid waterlogged conditions, as this can lead to root rot.
Ensure good drainage, particularly in containers, to prevent fungal issues and promote healthy rhizome development.
Pruning is generally not required for White Trilliums. Remove any dead or damaged leaves in late autumn or early spring before new growth appears.
Deadheading spent flowers can improve the plant's appearance and prevent unnecessary energy expenditure on seed production, though it's not essential.
Propagation is primarily done by division of rhizomes in late summer or early autumn after the foliage has died back. Seeds can be collected from ripe fruits, but germination is slow and requires stratification.
Patience is key for both methods; expect slow but rewarding results.
Repot Trillium grandiflorum only when necessary, typically every 3-5 years, or when the rhizomes become crowded. Use a well-draining, humus-rich potting mix.
Repotting is best done in late summer or early fall when the plant is dormant to minimize transplant shock and allow for establishment.
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Monthly activity intensity for bloom and fruit across both hemispheres.
Flowering & fruiting calendar
Flowering & fruiting calendar
Photos of White Trillium (Trillium grandiflorum)
Where White Trillium (Trillium grandiflorum) is found
Density
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Common names and botanical synonyms
Botanical classification
| Rank | Name |
|---|---|
| Kingdom | Plantae |
| Division | Tracheophyta |
| Class | Liliopsida |
| Order | Liliales |
| Family | Melanthiaceae |
| Genus | Trillium |
| Species | Trillium grandiflorum |
Similar in genus Trillium
Answers based on plant encyclopedia data
