The Chelsea Chop
The Chelsea Chop
Around this time every year you might hear gardeners talking about ‘The Chelsea Chop’— a phrase that sounds like, what? A soccer move? A Brit punk band?
It is actually quite a practical gardening technique cued to coincide with the renowned Chelsea Flower Show in England, which was going on last week. The idea is simple enough: certain herbaceous perennials are cut back just as they are beginning their great seasonal surge.
And honestly, it can feel a little insane.
Just as the summer perennial garden is beginning to look lush, fill in, and take shape, gardeners walk into borders and start cutting healthy growing plants down by a third, a half, or sometimes more.
The reasoning, however, is sound, and the timing is right on. Cutting and pinching back during this window in the season can delay flowering, reduce height, encourage branching, lessen flopping, and often create a sturdier, longer-lasting display only slightly later in the season. Instead of one tall flush of bloom collapsing in midsummer heat or rain, the plant slows down, thickens up, sometimes increases flowering, and often performs more gracefully over time with less need for staking or propping.
Of course, not every plant responds well, and not every garden needs it. Like so many gardening techniques, “The Chelsea Chop” is less a rule than a tool — one more way gardeners negotiate with timing, scale, weather, and their own expectations for when the show really wants to go on.
There is also something psychologically difficult about this kind of gardening. Most of us are far more comfortable with adding than subtracting. We wait all winter for growth and abundance, then as the garden is finally delivering exactly that — we are urged to walk in and start cutting.
Experience helps. So does trust.
‘The Chelsea Chop’ is ultimately less about control than editing. It is not punishing a plant or forcing it into submission. It is more like redirecting momentum. A conversation about timing. An acknowledgment that in gardening, as in many things, more is not always better, and a bit at a time can be more rewarding than all at once.
Maybe this is why the phrase has endured. “The Chelsea Chop” sounds dramatic, and it is fun to say. It reminds me a little of the old Seinfeld bit about salsa — “people like to say salsa.” If you know, you know.... Anyway, the Chelsea Chop is not simply about gardeners knowing what we want from our gardens, but also when we want it.
Perennials That Make the Cut
I like to divide the list of perennials to consider into 4 categories - Must Chop, Might Chop Don't Chop, and an unfortunate fourth one. Observation gives us a lot of cues - any perennial that is growing fast and furious now with many stems or getting lanky and tall is a candidate. I also think about 'how' I am going to make my cuts - how deep to cut back, entirely or selectively. A lot of these determinations are based on experience and years of practice. For the novice, some back up can be helpful. Last week in TWIG we talked about misinformation - I left a list of books to consider. Today I'm going to reinforce - The Well-Tended Perennial Garden by Tracy DiSabato-Aust. It is on my desk now and usually lives in my truck at this time of year. Better still is to work with someone who has had a lot of experience - that is how I gained so much of my own knowledge and technique. Maybe we can figure out how to do something 'live/virtual' during 'A Growing Conversation'? Express interest!
Must Chop
Chrysanthemum, aster, tall sedum, eupatorium, garden phlox - these characters - all later summer blooming - want a good hard cutback now. Think by at least half - even 2/3rds. I don't really worry too much about 'shaping' for these perennials - they are going to rebound quickly at this time of year, and some of the really later bloomers might even like a second pinch in a month or so. I pretty much mow through the new growth with secateurs, or if I'm really in a hurry, will occasionally pull out my shears. Clippings go off to the compost - except sometimes sedum. Long stonecrop stems can root in pretty predictably if you want to propagate for more. I posted some examples in 'The Gardener's Stream' earlier this week.
Might Chop
This category gets really nuanced. A lot of perennials will rebound from some cutting or pinching now, and I like to let considerations of size, placement in the border, and bloom time dictate what I might give a bit of chop, and what I might allow to roll right in to bloom. If I am having a nice late spring season with continued blooming annuals or biennials, I might push the summer boom back a little. If I'm feeling like the party is over, I might let some things come right in to flower. I often do some cutting back selectively - cutting 1/3 of stems by half and another 1/3 by a third, and leaving the rest alone, to vary bloom time. 'Stadium pruning' is great for traditional borders, leaving the tall stems of the back of a plant up and stepping down as you work forward keeps the tall flowering at the back and makes deadheading practical later.
Finally, I'm not going to pretend that I know or remember what every perennial wants or will take. I am pretty constantly looking things up to remind and reassure myself.
Don't Chop
Peonies, daylilies, astilbe, iris (all varieties), baptista - really any of the early spring perennials - don't want to be cut back. These plants have already invested their energy in the flowers you are seeing now, or about to. Cutting them back at this time would remove the show.
Got Chopped
Oh this sad category! This week I got to one of my developing perennial borders and immediately knew something was missing. Half a dozen patches of phystotegia, munched down by rabbits! Well, I guess we will see how obedient plant responds to an unintentional chop. If you have wildlife intervening in your plans for cutting back, or maybe you just got a little ‘Chelsea Chop’ overzealous - don't fret too much! Perennials are resilient and likely to rebound. You may not have flowering this season, but it’s a good opportunity to experiment with adding a few summer annuals and learning your lesson. Or get to taking measures against the encroachers!
So, I know this all seems a little daunting and indistinct. Guidelines might boil down to:
If a perennial is growing rapidly, expected to flower late summer, will be getting too tall/floppy or needing a lot of staking, it is a good candidate for the Chelsea chop
If it is already flowering, about to flower, or is holding its own, it is better to leave it alone.
If you are unsure - do some research. Look it up, ask someone, or reach out to the gardeners in GARDEN CLUB!
All this technique is sort of like conducting or orchestrating a seasonal symphony. The occasion of the Chelsea Flower and Garden Show is like the curtain raising on the summer season. So grab your baton, players ready, and keep your eyes on the score!
P.S. – Sorry GARDEN CLUB – no good photos for this bulletin. Nothing really illustrative this time. The best I can offer is to get you hands on the great book!
