How to prune dahlia 'bora bora'

Pinch in late spring; deadhead through summer and early autumn; cut back post-frost. Remove the growing tip above the third set of leaves. Throughout summer, cut spent flower stems back to a leaf axil or lateral shoot to stimulate new buds.

Pinch once at establishment; deadhead every 5–7 days in season. Pruning is essential for dahlias. Pinch the central shoot when plants reach about 30–40 cm to produce a bushy plant with more flower stems. Deadhead regularly to prevent seed set and keep blooms coming. After autumn frost kills the top growth, cut stems back to ground level before lifting or mulching tubers.

Remove the growing tip above the third set of leaves. Throughout summer, cut spent flower stems back to a leaf axil or lateral shoot to stimulate new buds.