August Garden Guide - A Maintenance Checklist for South Louisiana

August Garden Maintenance in South Louisiana

August in South Louisiana remains hot, humid, and intense, with the lingering grip of summer and the growing possibility of tropical weather. Gardens are still productive but often show signs of fatigue after weeks of heat stress. This is a critical transition month—continue protecting and harvesting summer crops while beginning the serious push toward fall plantings. Consistency with watering, pest control, and bed preparation will set you up for a strong autumn.

Flower Beds & Landscape

Focus on keeping beds tidy and supporting plants through the final stretch of peak heat.

• Refresh with heat-tolerant annuals such as portulaca, lantana, purslane, angelonia, coleus, and vinca
• Add or replace tropicals including hibiscus, plumbago, croton, ginger, and ornamental sweet potato
• Replenish mulch to keep roots cooler and conserve moisture
• Cut back leggy or overgrown annuals and perennials to encourage fresh growth and better airflow
• Deadhead regularly to prolong flowering through the end of summer

Vegetables – What to Plant in August

(Use the full Louisiana Vegetable Planting Guide on the LSU AgCenter website for spacing, depth, and recommended varieties.)

• Direct seed or transplant Southern peas, okra, and Malabar spinach
• Start seeds indoors or in protected areas for tomatoes, peppers, and eggplant for fall production
• Continue harvesting summer crops daily—okra, peppers, eggplant, and late tomatoes
• Remove spent summer plants and prepare beds with compost for fall plantings

Mid-to-late August is an excellent window for many cool-season crops once soil temperatures begin to ease slightly.

Trees, Shrubs & Vines

Growth slows under extreme heat; prioritize establishment and recovery.

• Limit new plantings unless you can provide consistent water and temporary shade
• Deep-water established trees and shrubs during dry stretches between rains
• Train and support vigorous vines
• Remove only dead or damaged wood—avoid heavy pruning in peak heat
• Watch for leaf scorch, wilting, and early fall color on stressed plants

Bulbs & Perennials

Summer performers continue, and preparation for fall begins.

• Deadhead and lightly shape summer-blooming perennials (salvia, lantana, gaillardia, coneflower)
• Allow any remaining spring bulb foliage to die back completely
• Plant or divide heat-loving perennials and tropical bulbs such as canna, crinum, and elephant ears
• Mulch well to moderate soil temperature and retain moisture

Lawn Care

Warm-season lawns are still growing but under significant stress.

• Maintain a higher mowing height (3.5–4 inches) to shade the soil and reduce heat stress
• Water deeply and infrequently (about 1–1.5 inches per week) early in the morning when rainfall is insufficient
• Apply iron or a light fertilizer only if the lawn appears pale; avoid heavy nitrogen applications
• Scout carefully for chinch bugs, armyworms, grubs, and fungal diseases
• Repair bare spots with sod or plugs when temperatures and moisture allow

Watering & Irrigation

Still the most important task of the month.

• Water early in the morning to reduce evaporation and disease pressure
• Practice deep, infrequent watering to encourage strong root systems
• Check containers and newly planted material daily—they dry out quickly
• Improve drainage in low areas prone to standing water after heavy rains or storms

Pests & Diseases

Pressure remains high in the heat and humidity.

• Monitor closely for spider mites, whiteflies, aphids, caterpillars, stink bugs, and squash bugs
• Watch for fungal problems including powdery mildew, leaf spot, and rust
• Treat issues promptly before populations explode
• Remove and discard heavily damaged plant material
• Improve air circulation and avoid late-day overhead watering

General Garden Tasks

• Fertilize containers and heavy-feeding annuals every 1–2 weeks with a balanced or bloom-boosting formula
• Harvest vegetables and cut flowers in the early morning for best quality
• Keep weeds under control while they are small
• Clean, sharpen, and oil tools regularly
• Begin serious bed preparation and soil improvement for fall vegetables and flowers

Final Thoughts

August tests both plants and gardeners. The heat is still intense, storms can arrive with little warning, and many plants are showing the cumulative effects of a long summer. Stay disciplined with watering, pest monitoring, and harvesting. At the same time, shift your focus toward fall—clear spent crops, improve soil, and start cool-season plantings.

Work during the cooler parts of the day, stay hydrated, and take pride in the resilience of your garden. The transition from summer abundance to fall planting is one of the most rewarding periods of the year in South Louisiana. Get outside, enjoy the garden, and prepare for the excellent growing weather still ahead.