How to prune lobelia erinus 'cascade blue'

Mid-summer, after the first main flowering flush begins to exhaust. Use scissors to trim all trailing stems back by one-third to one-half. Water and apply a balanced liquid fertiliser after cutting. New growth and flowering typically resume within 2–3 weeks. Remove any dead or brown stems entirely.

Once mid-season; deadhead lightly between main flushes. 'Cascade Blue' is a trailing annual lobelia used in hanging baskets and window boxes. It can become straggly mid-season. Shear the whole plant back by about one-third after the first main flush to refresh growth and stimulate a strong second bloom. This is the most effective pruning technique for trailing lobelia cultivars.

Use scissors to trim all trailing stems back by one-third to one-half. Water and apply a balanced liquid fertiliser after cutting. New growth and flowering typically resume within 2–3 weeks. Remove any dead or brown stems entirely.