Iridaceae
Iris × thompsonii
Iris × thompsonii
Also known as Iris × aureonympha, Iris tenax subsp. thompsonii, Iris tenax var. thompsonii, Limniris × thompsonii
Flowering Plants · Native Plants · Iris · Pacific Coast Iris · Hybrid · Native · Woodland · Perennial · California · Oregon · Part Shade · Rhizome
Thompson's iris is a naturally occurring hybrid native to the Pacific Coast, valued for its elegant blooms and adaptability to part-shade woodland gardens. Plant rhizomes just at the soil surface in well-drained, slightly acidic soil with good organic content. Divide clumps every three to four years in late summer to maintain vigor and encourage prolific flowering.
Growing conditions
The details behind the basics
- Daily light
- 4 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
- -10°F to 85°F
- Cycle
- Perennial
Hardiness
USDA 5a-9b
Form & growth
Mature size and habit
- Mature height
- 18 in – 3 ft
- Spread
- 2 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
- Attracts
- Bees, Butterflies, Hummingbirds
Sources: trefle, usda
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