As summer progresses, July offers a crucial window for planting autumn crocus, also known as colchicum, to ensure a vibrant display from September through October. These flowers produce striking blooms in shades ranging from rich purple to pale pink, appearing without foliage—hence their nickname "naked ladies."
Planting guidelines for best results
Autumn crocus bulbs should be planted no later than early August. Position them 8–10 cm deep in the soil, 15 cm apart, with the pointed end facing upward. They can go directly into the ground or in containers filled with peat-free multipurpose compost. The bulbs thrive in moist yet well-drained soil in dappled shade, ideally near trees, in grass, or at the front of a border.
Safety and maintenance
Handle the plants with gloves, as all parts are toxic if ingested by humans or animals. Autumn crocus requires no pruning; let the foliage die back naturally after flowering. The plant then lies dormant until the following spring. Pests and diseases are rarely a concern, though watch for aphids and mould. The flowers spread naturally, but for manual propagation, remove offsets from the main corms in summer once the leaves have completely died back.
Choosing varieties and timing
When buying bulbs, avoid corms that feel soft or show white mould. For specific colours, choose Colchicum 'Waterlily' for double pink-purple flowers, Colchicum autumnale 'Album' for pure-white easy-to-grow blooms, or Colchicum speciosum 'Album' for larger white flowers with green throats. Plant between July and August; missing this window may delay flowering until the following season. Alternatives for September colour include hydrangeas, dahlias, foxgloves, and wallflowers, according to BBC Gardeners' World.
