The Chelsea chop is a useful technique that helps control the size, shape and flowering time of certain summer-flowering plants – and late-May (around the time of the RHS Chelsea Flower Show) is the perfect time to do it.
By carrying out the Chelsea chop on your plants, you'll also encourage the production of more flowers. After you've cut back your plants, make sure you give them a thorough watering and some feed.
Discover 11 plants to Chelsea chop, below.
Cut back phlox to encourage greater production of the richly scented blooms.
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Campanulas are known for their lovely bell-shaped flowers, in vivid shades of blue and purple. Cut them back to encourage more of the beautiful blooms.
Asters form a rich nectar source for flying insects, and respond well to the Chelsea chop. Asters you could cut back include Aster macrophyllus and Symphyotrichum laeve (formerly Aster laevis).
Many rudbeckias can grow so tall that they risk flopping over in windy weather. Chelsea chopping them will help to restrict their height.
Sedums are prone to becoming leggy and looking untidy. Give them the Chelsea chop to encourage a neater, more compact shape, with more flowers.
By cutting back nepeta, or catmint, you'll encourage a profusion of blooms to be produced later on, providing a later source of nectar and pollen for bees.