In the UK, Crocosmias typically flower from mid to late summer, and their flowering period can last for several weeks. The exact timing of flowering can vary depending on the specific cultivar, local climate, and growing conditions.

In most regions of the UK, you can expect Crocosmias to start flowering from late July or early August and continue blooming through September. Some cultivars may begin flowering slightly earlier or later, but overall, they provide a beautiful display of colors during the late summer months.

To enjoy a longer flowering season, choose different Crocosmia cultivars with varying bloom times. This way, you can have a succession of flowers in your garden, creating a continuous and colorful show from mid to late summer.

As with any plant, the actual flowering duration can be influenced by factors such as weather conditions, temperature fluctuations, and the health of the plant. Providing proper care, including adequate sunlight, well-draining soil, and regular watering, can help maximize the flowering period of Crocosmias in the UK. Additionally, deadheading spent flowers can encourage the plant to produce more blooms and extend the overall flowering season.