How to Prune blue sage?
Usually little pruning is needed. Lightly shape if necessary, removing dead, damaged or diseased shoots. Prune after flowering.

blue sage · Eranthemum pulchellum
Also known as: Florida blue sage
Grow under glass in a loam based potting compost in bright filtered light with shade from hot sun. Water moderately in growth applying a balanced liquid fertiliser monthly. Water sparingly in winter
Usually little pruning is needed. Lightly shape if necessary, removing dead, damaged or diseased shoots. Prune after flowering.