Bulb iris (Iris tuberosa)

Bulb iris

Also known as: Widow iris

Bulb iris comes from Mediterranean Europe. This species will happily form large colonies when it has the right amount of sunlight. It is a popular garden flower that blooms at the height of winter as long as temperatures are not too cold.

Scientific classification

Species

Bulb iris (Iris tuberosa)

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Toxic to Pets

Toxicity

Perennial

Lifespan

Herb

Plant Type

Spring, Winter

Bloom Time

Green, Black, Yellow

Flower Color

Green, Black

Stem Color

Deciduous

Leaf type

15 - 35 ℃

Ideal Temperature

Images of Bulb iris

Distribution of Bulb iris

Distribution Map

Bulb iris is native to the Mediterranean region, predominantly found across its southern and eastern areas. It is cultivated and also occurs as an introduced species on other continents such as Europe and Africa, adapting to similar climates within these regions.

Native

Cultivated

Invasive

Introduced

No species reported

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Hemisphere Trend Curve

Northern

Sorthern

Care Guide for Bulb iris

Every week

Water

Full sun

Sunlight

15 - 35 ℃

Ideal Temperature

Water: Bulb iris thrives in well-drained soil and has moderate water needs, requiring weekly watering. Originating from Mediterranean regions, it adapts to winter rain and dry summers, best grown outdoors to resemble its natural cycle, including dormancy during hot, dry periods.

Fertilize: Fertilize bulb iris sparingly with balanced fertilizers at planting and high phosphorus during growth, focusing on early spring and post-flowering. Adjust for seasonal growth stages, applying less in dormancy. Follow guidelines for quantity and distribute evenly, avoiding foliage contact to prevent burns, maximizing health and blooms.

Pruning: Bulb iris features grass-like leaves and fragrant blooms, benefiting from annual pruning. Remove damaged foliage in spring and prune flower stems post-bloom to encourage future growth. Careful pruning supports air circulation, decreases disease risk, and promotes vigorous flowering while protecting sensitive rhizomes.

Propagation: Bulb iris can be propagated through division by carefully separating bulb-like roots, ensuring each section has roots for re-establishment. Replant segments at the same depth as the original bulbs to promote strong growth, facilitating quick establishment and revitalization in new locations.

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