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Perennial Selection, Planting, and Division Calendar for 4-Season Color
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Perennials are the backbone of a low-maintenance garden — plant once, harvest years of color, structure, and pollinator support. But the “plant and forget” myth leads to crowded, non-blooming, disease-prone clumps. Here is the selection, planting, and division calendar that keeps perennials performing like pros.
Selection matrix (choose 3–5 per bed for succession)
| Season | Sun (6+ hrs) | Part Shade (3–5 hrs) | Shade (<3 hrs) |
|---|---|---|---|
| Early Spring | Creeping Phlox, Iberis, Hellebore | Bleeding Heart, Brunnera, Pulmonaria | Hellebore, Epimedium, Ferns |
| Late Spring | Peony, Baptisia, Salvia | Columbine, Foxglove, Geranium | Hosta, Astilbe, Heuchera |
| Summer | Coneflower, Black-eyed Susan, Daylily, Russian Sage, Catmint | Astilbe (late), Japanese Anemone, Ligularia | Hosta (flower), Ferns, Hakone Grass |
| Fall | Sedum ‘Autumn Joy’, Aster, Goldenrod, Ornamental Grasses | Japanese Anemone, Toad Lily, Actaea | Toad Lily, Ferns, Heuchera (foliage) |
Planting protocol (get it right once)
- Dig hole 2× width, same depth as pot
- Amend backfill: 70% native soil + 30% compost
- Tease circling roots, score root ball 1 in deep 4×
- Plant crown at soil level (not buried, not exposed)
- Backfill, firm gently, water to settle (eliminate air pockets)
- Mulch 2–3 in (keep 2 in clear of crown)
- Water deep 2×/wk first season (establish deep roots)
The division calendar (renew vigor, get free plants)
| Plant Type | When | Frequency | Method |
|---|---|---|---|
| Spring bloomers (Phlox, Iris, Peony) | Late Summer / Early Fall | 3–5 yr | Dig clump, cut rhizomes/roots, 3–5 eyes per division |
| Summer bloomers (Daylily, Hosta, Coneflower) | Early Spring (before growth) | 3–4 yr | Fork clump, pull apart fans/crowns, 3+ shoots each |
| Fall bloomers (Sedum, Aster, Grass) | Early Spring | 3–5 yr | Divide crown, 3+ stems each |
| Grasses (Miscanthus, Calamagrostis, Panicum) | Early Spring (before shoots) | 3–4 yr | Saw/axe clump, 3+ tillers each |
Deadheading & cutback rules
- Deadhead: Repeat bloomers (Salvia, Catmint, Coneflower, Gaillardia) → cut to lateral bud
- Leave seed heads: Coneflower, Black-eyed Susan, Grasses, Sedum — winter interest + bird food
- Cut back: Late winter (Feb–Mar) — cut to 2–3 in above crown. Evergreen perennials (Hellebore, Epimedium): remove only tattered leaves.
One-line verdict
Pick 3–5 per bed for 4-season succession, plant crown-level in amended soil, divide on calendar — perennials that bloom bigger every year with less work.