September/October Garden Calendar
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Collapse ▲Plants in Flower
| Helenium/Sneezeweed | Japanese anemone |
| Rose-of Sharon/Hardy hibiscus | Butterfly bush |
| Dahlia | Bluebeard |
| Canna Lily | Tickseed |
| Chrysanthemum | Lavender |
| Crocus | White turtlehead |
| Liriope | Russian sage |
| Sedum | Sasanqua cammelias |
| Asters | Hardy lematis |
| Goldenrod | Crepe myrtles |
| Joe Pye Weed | Summer annuals |
Fertilizing
- September: See Lawn Care
- October: Spring-flowering bulbs at planting time with a balanced fertilizer
Planting
(September)
- Set out landscape plants. Shop early to find the nicest shrubs.
- When planting containerized plants in the landscape, make sure to break up the plants’ root ball, especially if it is pot bound.
- Set out new chrysanthemum plants this month.
- Plant pansies to add color to your yard in the autumn, winter, and spring months.
- Groundcovers will become well established if planted now.
- Transplant any evergreen trees or shrubs that need moving this month.
- Plant fall vegetables like mustard, onion, radish, and turnip.
(October)
- Plant spring-flowering bulbs like daffodil, tulip, crocus, and hyacinth.
- Continue setting out pansies, new plants perennials, or transplanting.
- If you don’t have a fall vegetable crop, plant cover crops like hairy vetch, winter rye, and crimson clover.
- Start salad vegetables in a cold frame & enjoy all winter. Plant lettuce, green onions, carrots, radishes, and most leafy greens inside cold frame.
Pruning
- Consider leaving seed heads of perennials like black-eyed Susan and coneflower as food for wildlife this winter!
- Do NOT prune shrubs in September or October.
- Remove “weed” or unnecessary trees from your landscape.
- Root-prune any trees or plants you plan to move next spring.
- Cut back any herbaceous perennials with spent flowers and after frost kills the tops.
Spraying
- Spray landscape shrubs for the following insect pests: arborvitae, hemlock, and juniper (spider mites), azalea and pyracantha (lace bug), and euonymus (scale)
- Spray for peachtree borer on your nectarine and peachtree trunks.
- Continue with rose spray program.
- Scout fall vegetable plants. Insects and diseases are more severe in the autumn.
- Control woody weeds by spraying the recommended herbicide.
- Store garden pesticides in a secured, dry location that will not freeze.
Lawn Care
- Take a soil sample!! Free analysis until December 1!
- Tall fescue and bluegrass lawns should be seeded in (September). Remember to mulch the newly seeded areas with wheat or barley straw. Keep watered.
- Fertilize and lime your tall fescue lawns according to soil test results (September).
- Do NOT fertilize zoysia now.
- Homeowners can apply an insecticide for lawn grubs in early September if needed.
- Keep tree leaves from collecting on your lawn.
Propagation
Divide and replant perennials, spring-flowering bulbs & peonies (September–early October) once foliage begins to die back.- Dig and divide rhubarb (October).
Specific Chores
- Clean up garden sprayers and lawn equipment if not in use.
- Prepare houseplants to reenter your home. Check them carefully for insect pests.
- If you do not have a fall vegetable garden, it is a good time to chop, burn, or discard dead vegetable plants.
- Start filling your compost bin as leaves begin to fall.
- Prepare bird feeders.
- Dig and store summer bulbs like gladioli, dahlia, and caladium before frost
- Dig sweet potatoes before frost kills the plants.