When to plant Crocosmia in London

Crocosmia spp.

Crocosmia
Crocosmia · Crocosmia spp.

Hardy perennial grown from corms in UK borders. Plant in moist but free-draining soil in sun or light shade, water well after planting, and leave the clump to settle before lifting and dividing every few years.

90 cm · Full Sun · Moderate Water

Calibrated to London · last frost ≈ 4 Apr

Plant out February to March. Frost risk November to April.
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Growing guide

What to do through the growing season

  1. 01

    Plant Corms

    21 Feb to 21 Mar

    Plant corms during 21st February - 21st March, deep and apart, in firm, well-drained soil. Water in thoroughly straight after planting.

  2. 02

    Water to Establish

    21 Feb to 2 May Dates as each sowing reaches this stage

    Keep the soil evenly moist through 21st February - 2nd May while the corms root in. Give a deep soak in dry spells, then ease off once new growth is strong and the clump is settled.

  3. 03

    Deadhead Spent Stems

    19 May to 10 Nov

    From 19th May, remove faded flower stems as they finish to keep the plant tidy and encourage a longer display. Cut each stem back to the base once the last flowers on it have gone over.

  4. 04

    Cut Back Old Growth

    17 Nov to 15 Dec

    After hard frost has blackened the leaves, cut the faded foliage to the base during 17th November - 15th December. Leave any green leaves in place until they die back naturally, because they are feeding next year's growth.

Suggested varieties

Popular varieties of Crocosmia to consider

Lucifer

A widely grown crocosmia with bright red flowers and good garden vigour.

Emily McKenzie

Compact, free-flowering with orange blooms marked darker at the centre.

George Davidson

A reliable yellow-flowered cultivar that works well in mixed borders.

Star of the East

Orange-yellow flowers on arching stems, useful for a naturalistic look.

Crocosmia guides by town

See how Crocosmia timing shifts in other towns with different frost dates.