Description of Iris sibirica 'Blue'

Iris sibirica 'Blue', also called Siberian Flag, is a hardy perennial plant. Gardeners love it for its simple beauty and reliable performance. It brings a cool, fresh feeling to gardens from late spring into early summer.

Appearance and Growth

This iris typically grows to a height of 60 to 100 cm. It forms neat, upright clumps of slender, grass-like leaves. These leaves stay green and attractive long after the flowers finish.

The flowers are the main event. They are a clear, bright blue, often with fine, darker lines on the petals. A small yellow or white mark sits at the base of each fall. Each flower measures about 8 to 10 cm across. They appear in abundance on slender stems that move gracefully in the wind. The main flowering period is May and June.

How to Grow Iris sibirica 'Blue'

This plant is known for being easy to care for. It adapts to many garden situations, though it has some preferences.

Sun and Soil
For the best flower show, plant your Iris sibirica 'Blue' in a spot that gets full sun. It will also grow well in partial shade, especially in hotter parts of the country. It likes soil that stays moist but drains well. Mixing in garden compost or well-rotted manure before planting gives it a strong start. While it enjoys damp soil, it handles drier conditions better than many other irises once its roots are established.

Hardiness and Maintenance
This iris is fully hardy throughout the UK. It handles frost and cold winters without any trouble. For routine care, water it during long dry spells to keep the soil moist. A layer of mulch around the base each spring helps retain water and suppress weeds. After flowering, you can cut the spent flower stems back to keep things looking tidy. In late autumn or early spring, cut the old foliage down to the ground.

Plant Care and Propagation

Every three to four years, the clumps may become crowded. The best time to divide them is in early spring or late summer. Carefully dig up the plant and use a sharp spade to separate it into smaller sections. Replant these divisions straight away. This process rejuvenates the plant and gives you new plants for other parts of the garden.

Garden Uses for Siberian Flag Iris

Iris sibirica 'Blue' is very versatile. Its upright shape makes it perfect for the middle of a mixed border. It is a classic choice for planting near a pond or stream where the soil is naturally moist. You can also use it to create a naturalised look in a damp meadow area.

The flowers last well in a vase, bringing their elegant form indoors. This plant also supports garden wildlife. Bees and other pollinating insects visit the flowers for nectar. The dense clumps of foliage can help hold soil in place on slopes or in wet areas.

Iris sibirica 'Blue' is a sensible and beautiful choice for British gardens. Its combination of lovely blue flowers, architectural foliage, and easy-going nature makes it a reliable performer for years to come.