How to prune blue dawn flower

Late winter/early spring before new growth; tidy trim after summer flowering. In late winter, cut all stems back to 30–60 cm (12–24 in) from the base to reinvigorate the plant and control spread. After the summer flush, shorten long trailing stems by half. In cooler climates, treat as an annual and remove after frost.

Annually (hard cut-back) plus a tidy trim after main flowering. Yes, pruning is worthwhile — blue dawn flower is a vigorous tropical perennial that can become invasive in warm climates. Cut it back hard to near ground level in late winter or early spring before new growth emerges to control size and stimulate a fresh flush of stems. In frost-free gardens, also trim after the main summer flowering to keep it tidy.

In late winter, cut all stems back to 30–60 cm (12–24 in) from the base to reinvigorate the plant and control spread. After the summer flush, shorten long trailing stems by half. In cooler climates, treat as an annual and remove after frost.