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Notebook · Guide 1 October 2026 · seasonal

The Chelsea chop: shorter plants, more flowers, no staking

Cutting back some late-flowering perennials in late May makes them bushier, shorter and later to flower. Which plants to chop, how much, and how to stagger the display.

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A clump of tall sedum (Hylotelephium) in late May with fleshy grey-green leaves, with a dashed line across the clump marking a cut that removes a third to a half of its height.
1In late May, cut the clump back by a third to a half.

The Chelsea chop is named after its timing — around the RHS Chelsea Flower Show in late May — and it sounds brutal: cutting back perennials just as they're getting going. But on the right plants it gives you shorter, sturdier clumps that don't flop, more (if smaller) flowers, and a later display that carries the border into autumn.

In pictures

  1. Side-by-side in late summer: on the left an unchopped phlox clump, tall and flopping open; on the right a chopped clump, shorter, bushier and upright with more, smaller flower heads.
    2Unchopped (left) is tall and floppy; chopped (right) is shorter and bushier.
  2. A clump of echinacea where only the front half of the stems have been cut back, so the front is lower than the back.
    3Chop just the front half to stagger flowering.

01At a glance

  • When: usually late May or early June.
  • How much: cut clumps back by a third to a half.
  • Tools: shears or secateurs.
  • Result: shorter, less leggy plants that need less staking, with more, smaller flowers, a little later.

02Which plants

The RHS names these as suitable:

  • Echinacea purpurea (coneflower)
  • Helenium
  • Phlox paniculata
  • Hylotelephium (the tall sedums)
  • Solidago (goldenrod)
  • Cota tinctoria (golden marguerite, formerly Anthemis)

The RHS says many other summer- and autumn-flowering perennials respond in a similar way — but trying it on an unsuitable plant can cost you a year's flowers. If you're not sure, test it on one stem or one clump first.

03Step by step

  1. Pick your plants. Only late-flowering perennials — never spring or early-summer flowerers.
  2. Cut each stem back by a third to a half, just above a leaf.
  3. Feed and water afterwards to help the regrowth.

04Two clever variations

  • Spread the season: chop only some of the clumps. The unchopped ones flower first; the chopped ones follow.
  • Stagger one clump: cut just the front half of the stems. The front flowers later and lower, hiding the back's bare legs and extending the show.
Save your money
Fewer stakes. Chopped plants stand on their own far more often.
Longer flowering from plants you already own, without buying more.

How we checked this

Every care and safety claim on this page is verified against horticultural and veterinary sources.

Sources: RHS — Chelsea chop

Checked 1 October 2026. If our advice ever conflicts with the RHS, believe them and tell us.