Shade Cloth

Cover

Shade cloth is a woven or knitted material that reduces the amount of sunlight reaching plants. Although it is often associated with summer, it is also a form of season extension because it can keep crops productive longer during heat. By lowering heat stress, it helps some plants remain harvestable beyond their usual warm-weather decline.

How it works

The cloth intercepts part of the incoming solar radiation, lowering leaf temperature and reducing heat buildup in the air below it. This can slow bolting in cool-season crops and reduce sunscald on sensitive plants. It also softens wind and can reduce water loss from leaves. Because it does not seal in warmth, its main effect is moderation rather than heating.

Best for

Shade cloth is best for lettuce, spinach, cilantro, brassicas, and transplants that struggle in hot sun. It is useful in late spring, summer, and early fall, especially in hot inland or southern climates. It also helps during heat waves when fruiting crops are stressed by extreme sun exposure.

How to use it

Suspend the cloth above the crop so air can move freely underneath rather than draping it tightly on foliage. Install it before a heat wave or before cool-season crops begin to show stress. Keep it high enough for easy watering, harvest, and inspection. Remove or reduce shade as day length shortens or temperatures moderate.

Tips

The goal is to reduce stress, not create deep shade. Good airflow matters because trapped hot air can reduce the benefit. Watch plant growth and color to judge whether the level of shade is helping or limiting production.

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General guidance for US gardens. Pair with your local frost dates and hardiness zone. Page updated Aug 4, 2026.