When Is It Too Hot to Plant Okra in Zone 7b?

Planting from Seed

• The soil needs to be between 70 and 95 degrees Fahrenheit for okra seeds to germinate. Moist soil is generally cooler than the air around it. High temperatures may dry the soil out too much for the seeds to germinate but the soil will rarely be too hot for seed germination in zone 7b. Soak okra seeds overnight in water before planting to soften the hard seed coat and water as often as needed to keep the soil moist.

Seedlings

• When seedlings are first transplanted, they have limited root systems. If the temperature is very high, it is difficult for these root systems to absorb enough water to prevent wilting. If you are planting seedlings when the temperature is above 90 degrees, shade the plants. Snow fence, a cardboard box open at both ends, or even a pillowcase held up by sticks can be used for temporary shade.

Flowering and Pollination

• Pollination will be poor if the temperature is above 90 degrees. At 95 degrees the flowers may drop. A comparison of the USDA plant hardiness maps and the American Horticultural Society heat zone map indicate that most areas of zone 7b can expect maximum high temperatures above 90 degrees, so there may be a period in the summer when okra production stops. Plant 60 days before temperatures are expected to exceed 95 degrees, or plant in midsummer for a crop after the weather starts to cool off.

Water Stress

• If you can prevent water stress while the temperature is between 90 and 95 degrees, okra growth and production will not be affected as much. Frequent irrigation will keep the soil moist. Fertile, organic soil with high levels of organic matter hold more water, reducing water stress. A heavy layer of mulch on the ground keeps soil moisture from evaporating.