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By DR. DIANE RELF
Extension Environmental Horticulturist
With the first warm days of spring, gardeners are anxious to get their vegetable seed in the ground. Unfortunately, it is not the air temperature, but the soil temperature that controls seed germination. We have to wait for the soil temperature to reach the optimum for a specific crop if we hope to get a good stand of vigorous seedlings.
Planting at Minimum
Temperature for Germinations
Means It Will Take Longer
Some books give minimum temperatures for germination. This is the lowest temperature at which germination will occur for that crop, but the length of time for germination will be much longer than at optimum temperatures. Seed can be planted when the soil temperature reaches minimum level for that seed on the assumption that the temperature will continue to rise and germination will proceed at a rapid rate. Planting at a lower temperature results in greatly reduced germination.
Some crops require fluctuating temperatures that may be on a daily or
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