how and when should I prune lemon verbena

Question

I have two new plants which have been growing in the greenhouse through summer. They have grown tall and leggy,

Answer 1

Lemon verbena responds to pruning by producing new leaves at the whorl immediately below the cut rather than along the entire stem. As a result, this shrub can grow leggy. It requires regular pruning throughout the year to increase leaf production. Snip off leggy stems just above a leaf whorl.