How to Prune Erysimum 'John Codrington'?
Trim after flowering to prevent plants becoming leggy

Erysimum 'John Codrington' · Erysimum 'John Codrington'
Grow in a sunny position in poor to moderately fertile, well-drained, neutral to alkaline soil. Usually grown as a biennial, plant out at the end of summer for flowers the following year
Trim after flowering to prevent plants becoming leggy