Underwood's Trillium
Trillium underwoodii
Essentials
At a Glance
Plant Type
Perennial
Height
10 inches
Width
12 inches
Light
Partial Sun, Shade
Zones
6, 7, 8, 9
Water
Moist
Humidity
Moderate
Lifespan
Perennial
Native To
Eastern North America
Toxicity
Non-toxic
The Story
Plant Bio
Trillium underwoodii, known as Underwood's Trillium, is a perennial wildflower native to the moist woods of the southeastern United States. Notable for its beautifully mottled leaves and stalkless, erect, maroon-purple flowers that sit directly in the center of the three leaves.
Bloom Period:
Uses & Benefits:
Marketplace
Where to Buy
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Planting
How to Grow
- Tuck seeds just below soil surface in early fall for natural stratification.
- Mist cuttings regularly to maintain humidity and root in moist soil.
- Transplant seedlings when they reach a stable size, typically after two years.
- Apply a layer of mulch around the plant to retain moisture and suppress weeds.
- Water consistently during the active growing season for healthy growth.
- Divide clumps every 3-4 years to rejuvenate and control size.
Pro Tip
Plant in dappled shade with rich, well-drained soil for best results.
Keep It Thriving
Care Guide
Do
- Tuck seeds in a cool, shaded spot for natural stratification 🌱
- Keep soil consistently moist during active growth
- Mulch to retain moisture and regulate soil temperature
Don't
- Avoid overwatering to prevent root rot ❌
- Don’t expose to direct, harsh sunlight which can scorch leaves
- Refrain from disturbing the roots excessively during division
Seasonal Care Calendar
| Task | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mulch | ||||||||||||
| Plant |
Watch Out For
Pests & Diseases
Common Pests
Common Diseases
In the Garden
Landscape Uses & Companions
Landscape Uses
Companion Plants
Multiply
Propagation Methods
Good to Know
Common Questions
Underwood's Trillium questions
What zones can Underwood's Trillium grow in?
Underwood's Trillium is hardy in USDA Zones 6–9. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.
Is Underwood's Trillium deer resistant?
Not reliably. Deer may browse Underwood's Trillium, especially tender spring growth — plan on repellents or fencing where pressure is high.
When does Underwood's Trillium bloom?
Underwood's Trillium typically blooms in mid-spring through late spring. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.
Does Underwood's Trillium need full sun?
Underwood's Trillium does best in part shade.
More Trillium to compare
Missouri form Large-flowered Trillium
Trillium recurvatum 'Missouri form'
Great White Trillium
Trillium grandiflorum
Vasey's Trillium
Trillium vaseyi
Toadshade
Trillium cuneatum
Rugel's Trillium
Trillium rugelii
Large-flowered Trillium
Trillium grandiflorum 'Mix'
Keep exploring
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Grow Underwood's Trillium with confidence
See it in a design of your actual yard, get zone-matched care reminders, and track it season by season in your garden journal.
