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What To Do in Your Backyard in September

Lawn Care

  • Lawns often thin in shady areas but typically recover during the fall through spring growing season.

  • Begin sodding lightly shaded areas once drier weather returns.

  • Where turf struggles to grow, consider replacing it with an attractive ornamental groundcover.

  • Mushrooms in the lawn are often a sign of healthy soil activity and beneficial organisms. Removal is generally unnecessary unless children or pets may come into contact with them.

  • Lawns infested with aggressive weeds should be renovated by removing affected areas and resodding, or by spot-treating with appropriate herbicides.

  • Repair pest-damaged or weed-infested areas with sod, plugs, or seed.

  • Delay broad weed-control applications until the end of the month.

  • Wait until October to fertilize lawns.

  • If turf appears pale, an application of iron or minor nutrients may provide temporary greening until regular fertilization begins.

  • Fall fertilizer applications are typically made in late September or October.

  • Complete Bahia grass seeding by early September.

  • Monitor for lawn caterpillars and chinch bugs, which can remain active into fall.

  • Fire ants are common in lawns. Treat individual mounds first, then consider treating the entire lawn if necessary.

  • Test soil pH and adjust as recommended.

  • Aerate compacted soils or areas that are difficult to wet.

  • Nematode management products are increasingly available through professional lawn-care providers.

  • Continue mowing at recommended heights and periodically vary mowing patterns to reduce wear.

  • Service lawn equipment now to ensure it is ready for the fall season.

In the Landscape

  • Prune dead, damaged, or declining branches affected by freezes, drought, or pests.

  • Control weeds before they produce and disperse seed.

  • Refresh mulch layers in preparation for drier fall weather. In many areas, only a light topdressing is needed.

  • Many landscape plants have exceeded their intended space; now is a good time for corrective pruning.

  • Give poinsettias and hydrangeas their final seasonal pruning.

  • Remove dead stems and spent blooms from roses to encourage healthy growth.

  • Clean and sharpen pruning tools to ensure clean cuts and reduce plant damage.

  • Expect caladiums and some ginger species to decline and enter dormancy until spring.

  • Replace declining annual flowers with warm-season selections and postpone cool-season plantings until temperatures moderate.

  • Clean containers thoroughly and refresh potting soil before replanting.

  • Incorporate organic matter into sandy or previously planted sites to improve soil quality.

  • Remove declining palm fronds and flower stalks, but retain healthy green fronds.

  • Sterilize pruning tools between palms to help prevent disease spread.

  • Avoid planting palm species known to be susceptible to prevalent diseases.

  • Watch for scale insects, mealybugs, and aphids, and treat when necessary.

  • Sooty mold often develops on insect honeydew. Controlling the insects and applying horticultural oil will help manage both problems.

  • Check container plants for clogged drainage holes and repot when needed.

  • Chrysanthemums provide excellent fall color, but heat shortens their display. For best results, wait until November to purchase.

  • Divide and replant overcrowded perennials.

  • Cool-climate bulbs are available, but many require special chilling treatments to perform well in Florida.

  • Add new trees, shrubs, and palms to the landscape.

  • Continue palm fertilization through October, or apply a slow-release palm fertilizer three to four times annually.

  • Begin fall fertilization of shrubs and perennials in late September, where permitted.

  • Feed hanging baskets and orchids every other week.

  • Remove aging leaves and spent blooms from water lilies and provide monthly fertilization.

Fruit and Vegetable Care

  • Plant as many warm-season vegetables as possible this month.

  • Set tomato transplants in the ground or containers early and begin training them to sturdy supports.

  • Use large containers for vigorous vegetable crops to provide adequate root space and moisture retention.

  • Clean containers and replace potting soil before each growing season.

  • Keep container-grown tomatoes evenly moist to help prevent blossom-end rot.

  • Add vegetables and herbs to patio and balcony container gardens.

  • Most vegetables require full sun, although leafy crops often tolerate filtered sunlight.

  • Remember that the sun shifts farther south during fall and winter, potentially creating more shade in the garden.

  • Revitalize previously planted beds by adding compost, manure, or other organic matter.

  • Remove plastic from solarized garden beds and plant directly without tilling.

  • In areas with nematode problems, dig large planting holes and fill them with quality planting mix.

  • Keep newly planted crops and seedlings consistently moist; irrigate established crops as soil begins to dry.

  • Apply the first fertilizer application approximately two weeks after transplanting or seed germination.

  • Continue monthly fertilization for in-ground plantings and every two weeks for container crops.

  • Consider using a slow-release fertilizer, which may provide sufficient nutrition for the entire season.

  • Incorporate flowering plants among vegetables to attract pollinators.

  • Provide supports for tomatoes, peppers, cucumbers, and other vining or heavy-fruiting crops.

  • Rejuvenate herb gardens in late September with fresh plantings.

  • Inspect the garden daily to monitor moisture levels, manage pests, and support healthy fall growth.

  • Use mulch to conserve moisture, suppress weeds, and reduce soil splashing on edible crops.

  • Remove and root pineapple offsets to expand plantings.

  • Water citrus trees once or twice weekly during dry periods to support fruit development.

  • Start seedlings of cool-season crops toward the end of the month.

  • Begin fertilizing citrus and avocado trees late in the month.

Houseplant Care

  • Revive tired foliage plants by moving them outdoors to a shaded location while temperatures remain favorable.

  • Orchids and bromeliads often benefit from a period outdoors when growth begins to slow indoors.

  • Groom outdoor foliage plants by removing damaged or unattractive leaves.

  • Monitor for scale, mealybugs, thrips, and mites, and control infestations with appropriate low-impact treatments.

  • Gradually reduce watering and fertilization of Christmas cactus and other holiday cacti.

  • Decide which plants will return indoors as cooler weather approaches.

  • Repot foliage plants that have outgrown their containers before fall temperatures arrive.

  • Feed foliage plants monthly, or use a slow-release fertilizer according to label directions.

  • Replace declining houseplants with fresh selections for the new season.

  • Purchase amaryllis and paperwhite narcissus bulbs for holiday forcing displays.