SEPTEMBER Plant Care Checklist
Reduce irrigation times as day length shortens and plant growth slows. Photo: Courtesy UC Regents
Maintenance and prevention
- Reduce irrigation times as day length shortens and plant growth slows.
- Add garden waste, grass clippings, pruning material, and leaves to your compost so long as they are not diseased. Turn compost and keep it as moist as a wrung-out sponge.
- Refresh the spring application of mulch to bring it to two to four inches.
Planting and propagating
- Divide overgrown perennials as they finish blooming. Before replanting them, weed and amend garden beds.
- Renovate lawn by seeding bare spots, dethatching, and fertilizing. Consider replacing or reducing lawn area. Learn more about lawn care.
- Plant ornamental grasses, shrubs, perennials, evergreens, and groundcovers.
Cutting and pruning
- Cut strawflowers, statice, yarrow, and other flowers that preserve well. Hang them to dry for use in arrangements.
- Prune evergreen, summer-flowering shrubs.
Pests and weeds
- Reduce spider mites, scale, and other insect pests by taking houseplants outside and spraying them down with the hose in a part shade area. Keep the foliage dust free to discourage indoor pests.
- Use caulk to seal entries that ants may use to enter your home.
- Manage aphids and scale on outdoor and indoor plants to discourage ants.
Feed and fertilize
- Fertilize houseplants if needed.
- Feed azaleas, camellias, and rhododendrons with an organic fertilizer with no nitrogen.
- Feed citrus for the last time of the year, if needed.
- Plant cover crops to improve soil structure and fertility.
- Plant artichokes, arugula, cauliflower, celery, chard, collard greens, kale, lettuce, bunching onions, and peas.
- Learn more about crops to plant in September and other activities in the edible garden.
- Clear leaf and needle litter from gutters, roof, eaves, and vents.
- Clear branches 10 feet from the roof and chimney.
- Learn more about Fire-smart Landscaping.