How to prune cosmos 'sensation'

Deadhead throughout summer; hard pinch leggy plants midsummer if needed. Snap or snip spent blooms back to the next flower bud or leaf node. For leggy plants, cut stems back by one-third to a strong lateral shoot to prompt fresh bushy growth.

Deadhead every few days through bloom season; mid-season cutback if plants become leggy. Cosmos 'Sensation' is a fast-growing annual that blooms heavily from midsummer onward. Regular deadheading keeps plants productive and bushy. If plants get leggy mid-season, cut back by a third to stimulate fresh branching and new flowers. Allow some late seedheads to mature if you want self-sown plants next year.

Snap or snip spent blooms back to the next flower bud or leaf node. For leggy plants, cut stems back by one-third to a strong lateral shoot to prompt fresh bushy growth.