Seasonal Maintenance Guide
- Remove winter mulch and cut back perennials before new growth (April in downstate, May upstate)
- Apply compost and balanced organic fertilizer to beds
- Divide and transplant overgrown perennials
- Plant summer annuals after last frost (late May downstate, early June upstate)
- Prune roses and remove winter-damaged canes
- Mulch beds with 2-3 inches of hardwood mulch
- Deadhead roses, coneflowers, and perennials regularly
- Water deeply during dry periods, especially new plantings
- Monitor for black spot, powdery mildew, and treat with organic fungicides
- Stake tall delphiniums and phlox before they flop
- Cut back early bloomers like catmint for second flush
- Weed regularly before they set seed
- Plant spring bulbs in October-November
- Divide and transplant overcrowded perennials
- Plant mums and asters for late season color
- Continue deadheading until first frost
- Leave seed heads on coneflowers for winter birds
- Clean up diseased foliage but leave healthy stems for winter interest
- Apply winter mulch after ground freezes, especially upstate
- Plan next season and order seeds and plants
- Prune roses in late winter (March)
- Protect tender plants during extreme cold snaps
- Enjoy winter structure from ornamental grasses and seed heads
- Clean and sharpen garden tools