Nakashima Greenhouses
$10.50–$14.00Distance unavailable · 850 Quail Gardens Drive, Encinitas, CA 92024
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trefle.io · Taken Dec 27, 2021 by Hallie Carter (cc-by-sa)
Iridaceae
Toughleaf iris
Iris tenax
Also known as Limniris tenax, Iris tenax var. gormanii, Iris tenax subsp. klamathensis, Western blue iris
Zones 4–9Sun Partial SunWater ModerateCare Moderate
Flowering Plants · Native Plants · Iris · Native · Pacific Northwest · Oregon · Washington · California · Perennial · Woodland · Wildflower · Purple Flowers
Pet-safeAttracts pollinators
In stock at 1 nurseryStock updated 9/6/2026
Toughleaf iris is a resilient Pacific Northwest native that produces beautiful purple to lavender blooms in spring and thrives in partly shaded woodland garden settings. Plant in well-drained, humus-rich soil and water regularly during establishment, tapering off once the plant is settled. It is low-fuss once established and works beautifully as a ground cover or border plant in native or naturalistic gardens.
Growing conditions
The details behind the basics
- Daily light
- 5 hours
- Watering
- Water deeply to moisten the root zone, then allow the top inch of soil to dry before watering again · Every 7-10 days
- Maintenance
- Moderate
- Soil
- loam
- Soil pH
- 6–8
- Temperature
- -25°F to 95°F
- Cycle
- Perennial
- Propagation
- Seed, Division, Cutting
Hardiness
USDA 4b-9b
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Form & growth
Mature size and habit
- Mature height
- 12 in – 4 ft
- Spread
- 4 ft
- Spacing
- 18 in apart
- Growth rate
- Moderate
- Root depth
- Medium
- Flowers
- Yes
- Foliage
- Medium
Ecology & origin
Where it belongs and what it brings
- Native to
- California, Oregon, Washington
- Attracts
- Bees, Butterflies, Hummingbirds
Sources: trefle, usda
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