Giant Blue Iris (Iris Giganticaerulea) is a perennial herb in the Iridaceae family with moderate care difficulty. It requires high watering and full sun or partial shade light in USDA hardiness zones 7-9. This plant is toxic to cats and dogs — keep it out of reach of pets.

Iris giganticaerulea is a large Louisiana iris known for its very large flowers ranging in color from light blue to lavender and purple, sometimes white to yellowish-white.

Giant Blue Iris

Giant Blue Iris

Iris Giganticaerulea

Iris giganticaerulea is a large Louisiana iris known for its very large flowers ranging in color from light blue to lavender and purple, sometimes white to yellowish-white.

Quick Facts

Type
herb
Lifecycle
perennial
Care Difficulty
Moderate
Water Needs
High
Light
Full Sun, Partial Shade
Hardiness Zones
7-9

Safety

⚠️
Not Pet Safe
⚠️
Not Child Safe
☠️
Toxic

Growing Conditions

Soil Types:loamy, silty, peaty
Indoor:No
Outdoor:Yes
Garden Use:ornamental, wetland restoration, pollinator habitat

Care Calendar

Monthly care tasks for Giant Blue Iris

Jan
Prune
Feb
Fertilize
Mar
Repot
Apr
Water+
May
...
Jun
...
Jul
...
Aug
...
Sep
...
Oct
...
Nov
...
Dec
...

Expert Care Tips

Pro tips from botanists and plant experts

Watering Tip

Check soil moisture by inserting your finger 1 inch deep. Water only when the top layer feels dry to prevent overwatering.

Humidity Trick

Group plants together to create...

Growth Hack

Rotate your plant every...

Photo Gallery10+ photos

Giant Blue Iris
Giant Blue Iris detail

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Taxonomy

Family:Iridaceae
Genus:Iris