When and how to cut back and prune delphiniums
I generally cut back and prune my own delphiniums in the autumn once the plant has finished blooming. However, deadheading the blooms throughout the growing season can often result in the second wave of flowers in late summer so I always try my best to promote that second flush of blooms. Deadheading Although delphiniums bloom for only a few months, you can extend this period by removing the flowers once they start to die off. I do this periodically through…