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10. Peonies
Why: While not for reblooming, trimming spent flowers prevents disease.
What to do: Deadhead the blooms, but keep the foliage intact to nourish the plant.
11. Veronica (Speedwell)
Why: Keeps the plant tidy and encourages more blooms.
What to do: Cut flower stalks after blooming ends.
12. Shasta Daisy
Why: Deadheading keeps the plant looking clean and promotes continued flowering.
What to do: Snip spent flowers just above the next set of healthy leaves.
🌼 Bonus Tip: The Chelsea Chop
If you haven’t already tried the “Chelsea Chop” (cutting back certain perennials by one-third to one-half around late May to early June), it’s not too late for some species. This technique works well on sedum, asters, phlox, and yarrow—encouraging bushier growth and delayed blooming for a longer display.
Final Thoughts
A little maintenance now can make a huge difference in how your garden looks and performs through summer and into fall. Cutting back these 12 perennials in June will help maximize their beauty, minimize disease, and keep your beds looking vibrant and healthy.
So grab your garden shears, step outside, and give your plants the summer boost they deserve!
Would you like a printable checklist for mid-summer pruning or a guide for fall perennials to prep next? I’d be happy to put one together!