How to prune crystal palace lobelia

Midsummer, after the first main flush of flowers fades. Shear plants back by one-third using scissors or garden shears, cutting just above a leaf node. Deadhead spent flower spikes regularly between cuts to extend the blooming season.

Once mid-season; deadhead as needed throughout. Crystal Palace lobelia benefits from a mid-season trim to refresh blooming. After the first flush of flowers fades in midsummer, cut plants back by about one-third to encourage a fresh wave of blooms through autumn. Without deadheading and occasional trimming, plants become leggy and flower production slows noticeably.

Shear plants back by one-third using scissors or garden shears, cutting just above a leaf node. Deadhead spent flower spikes regularly between cuts to extend the blooming season.