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seasonal basis. In addition, temperature is interrelated with light in certain crops. For example, celery requires temperatures below 50F to germinate if held in the dark at a constant temperature, but even in diffused light, will germinate at 70F; and with a 10 degree day/night fluctuation, will germinate at an SSF day temperature.
High Temperatures Can
Be Problems, Too
While many experienced gardeners have come to recognize this minimum temperature limit in the spring (often by trial and error), it remains difficult to understand that soil temperature is equally important in the summer when high temperature can cause dormancy, even death of seeds. The upper limits of soil temperatures for vegetable seed survival range between 86F and 104F. No crops tested at 113F survived more than 24 hours. Even when seeds do germinate in high temperature soil, the seedlings may die from the heat. The impact of excessively high temperature is not limited exclusively to soil temperature.
Seed stored at high temperatures, such as in a car with all the windows
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