Slender blue iris (Iris prismatica)

Slender blue iris

The Iris prismatica is also called the slender blue iris because of its slender blue flowers. It originates from the eastern and northern United States, as well as some parts of Canada. It grows in a swampy and wet environment. This iris plant has been listed as endangered and threatened in many states.

Scientific classification

Species

Slender blue iris (Iris prismatica)

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Toxic to Pets

Toxicity

Perennial

Lifespan

Herb

Plant Type

Spring, Summer

Bloom Time

69 cm

Plant Height

30 cm to 60 cm

Spread

Green, Gray

Leaf Color

5 cm to 10 cm

Flower Size

Care Guide for Slender blue iris

Every week

Water

Full sun

Sunlight

0 - 35 ℃

Ideal Temperature

Garden Soil

Soil Type

Water: Slender blue iris originates from wet meadows, preferring consistently moist soil. While it tolerates short dry spells, it thrives with weekly watering. Ideal for outdoor cultivation, slender blue iris is an herbaceous perennial whose growth and flowering depend on regular irrigation during active growth periods.

Fertilize: For optimal growth, slender blue iris requires balanced fertilizers (10-10-10) in spring-summer, switching to high-phosphorus types pre-bloom. Apply quarterly, adjusting in fall and winter, using water-soluble or granular formats. Ensure soil moisture before application to avoid root burn, enhancing foliage and blossoms.

Pruning: Slender blue iris features slender leaves and vibrant blue flowers. Prune early to late spring to support growth, remove dead foliage and spent blooms for health, and manage size. Clean tools are essential to prevent disease, enhancing aeration and overall vigor.

Propagation: Slender blue iris, native to wetlands, prefers moist, acidic soils and sunny to partly sunny conditions. It propagates through division, requiring careful rhizome separation. This adaptable species suits water gardens or natural areas, promoting healthy growth without becoming invasive.

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