Vesper Iris
Pardanthopsis dichotoma
Not currently listed at our partner nurseries.
Essentials
At a Glance
Plant Type
Perennial
Height
30 inches
Width
18 inches
Light
Full Sun, Partial Sun
Zones
4, 5, 6, 7, 8, 9
Water
Low to moderate
Humidity
Average
Lifespan
Perennial
Native To
Siberia, China, Mongolia
Toxicity
Parts may be toxic if ingested
The Story
Plant Bio
An iris relative, this short-lived perennial forms a clump of sword-like, gray-green leaves. In summer, branched stems rise bearing a profusion of small, iris-like, lavender flowers that open for only one day. Flowers open in the afternoon and last for only a day, but are produced in abundance. The plant is known as Vesper Iris because the flowers open in the evening (vespers). After flowering, seed pods split open to reveal blackberry-like seeds.
Bloom Period:
Uses & Benefits:
Marketplace
Where to Buy
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Planting
How to Grow
- Tuck seeds into well-draining soil in spring.
- Water regularly until established, then drought-tolerant.
- Place in full sun for optimal flowering.
- Mulch to retain moisture and suppress weeds.
- Divide every 3-4 years in early spring.
- Remove dead foliage in late fall for tidy appearance.
Pro Tip
Ensure excellent drainage to prevent root rot and promote healthy growth.
Keep It Thriving
Care Guide
Do
- Water during prolonged dry spells 💧
- Apply a balanced fertilizer in spring
- Divide clumps every 3-4 years
Don't
- Overwater in winter ❌
- Use heavy, clay soils without amendment ❌
- Allow soil to stay waterlogged ❌
Seasonal Care Calendar
| Task | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Deadhead | ||||||||||||
| Propagate | ||||||||||||
| Spring Cleanup |
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
Vesper Iris questions
What zones can Vesper Iris grow in?
Vesper Iris is hardy in USDA Zones 4–10. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.
Is Vesper Iris deer resistant?
Yes — Vesper Iris is rated deer-resistant. Deer typically pass it over, though extreme hunger can override any plant's defenses.
When does Vesper Iris bloom?
Vesper Iris typically blooms in mid-summer through late summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.
Does Vesper Iris need full sun?
Vesper Iris does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.
Is Vesper Iris drought tolerant?
Yes — once established (usually after the first full season), Vesper Iris handles dry spells with minimal watering. Water deeply its first year to build the root system that makes that possible.
Keep exploring
Explore the genus
Collections featuring this plant
Grow Vesper Iris 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.
