04/01/2026
Some great info on pruning perennials. Make sure to save for later reference!
Annuals you replant every year. Fruit trees you prune on a schedule. Shrubs follow old-wood-new-wood rules. But perennials — the plants that come back on their own — have their own set of cuts that most gardeners either skip entirely or get backwards.
The right cut at the right moment turns a floppy, one-flush perennial into a compact, multi-flush machine. The wrong cut — or no cut at all — gives you leggy stems, a single bloom, and a plant that collapses under its own weight by July.
Six perennials and grasses. Six early spring cuts. All of them change what happens for the next six months.
✂️ CUT BACK NOW — Remove Last Year's Growth:
1. Ornamental Grasses (Miscanthus, Switchgrass, Fountain Grass) — cut the entire clump down to 4 to 6 inches above the crown before new green blades emerge. Last year's dried stalks block sunlight from reaching the new growth pushing from the base right now. Cut too late and you shear off the new tips. Cut on time and the fresh clump grows in symmetrical, clean, and noticeably denser. Bundle the old stalks with twine before cutting — one clean slice, one neat bundle, no raking. Important: this applies to deciduous grasses only. Evergreen sedges like Carex and some warm-climate Pennisetum should not be sheared to the ground — comb out dead blades by hand instead
2. Russian Sage — cut all stems to 6 to 8 inches above ground when you see the first green buds breaking at the base in early spring. Last year's woody stems look alive but won't produce good flowers. New flowering shoots emerge from low on the plant. Leaving old growth forces flowers to the top of tall bare sticks. Hard cutting keeps the silvery-blue cloud compact and blooming at eye level. In cold climates where stems die back to the ground over winter, the plant does this work for you — just clean up the dead material
3. Liriope (Monkey Grass) — mow or shear the entire patch to 3 inches before new growth starts in March. Old browned foliage from last year hides and smothers the fresh green blades pushing underneath. One clean shearing reveals a completely fresh carpet within three weeks. Wait too long and you cut the new growth with the old
✂️ CUT STRATEGICALLY — Shape What's Emerging Now:
4. Sedum (Tall Varieties like 'Autumn Joy') — pinch or cut new stems back by one-third when they reach 8 inches tall in late spring. Without this cut, tall sedum grows top-heavy and splits open in the center by August, flopping outward like a donut. The pinch forces shorter, sturdier side stems that hold upright through bloom and into winter. The flower heads arrive a couple of weeks later but stay standing through the first snow — no staking required
5. Catmint — when the first flush of blue-purple spikes finishes in early summer, shear the entire plant by half. Within two weeks a second complete bloom cycle pushes from below the cut. In long-season climates a third flush is possible by fall. An unsheared catmint blooms once and goes brown. A sheared catmint can bloom two to three times and stay full across most of the growing season
6. Black-Eyed Susan (Rudbeckia) — pinch the tallest stems back by one-third in late May when they reach about 12 inches. This delays bloom by a couple of weeks but produces significantly more flower stems on a plant that stands noticeably shorter and sturdier. The branching triggered by the pinch creates a dense dome of golden flowers instead of a few tall singles that lean and fall. No staking needed on pinched plants
Every perennial garden has two versions of itself — the one that grows untouched and flops by midsummer, and the one that gets three strategic cuts and performs from May through October.
The difference is about fifteen minutes of work in spring 🌿
