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Toughleaf Iris

Iris tenax

perennial herb View on Calscape

Care

Sun

part shade

Water

low

Soil

Prefers sandy or loamy soils. Does not grow well in clay soils.

Size

0–1ft tall

Bloom

Mar-May

Deer

Resistant

Container

Friendly

Flowers

Prized

Native Range

Northwestern California coast and foothills from Humboldt County south to Mendocino County, below 2000 ft elevation, extending to Oregon.

Care Guide

Planting

Plant Toughleaf Iris in partial shade in sandy or loamy soil with good drainage - it struggles in clay, so amend heavy soil before planting. Space plants about 1.5 feet apart since they grow in tight clumps and spread slowly via rhizomes. Plant in fall or early spring for best establishment. This native iris is tough and low-maintenance once established, making it an excellent choice for Bay Area gardens.

After Planting

Water weekly during your first summer to establish the plant, then taper off as it becomes drought-tolerant - by year two, it should thrive on natural rainfall and occasional deep watering during dry spells. Expect lavender-blue to purple flowers in mid to late spring (March–May), and minimal pruning needs since the plant naturally forms a neat clump. The #1 mistake is overwatering or planting in clay soil; both lead to root rot. After the first year, this deer-resistant native requires almost no fussing.

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