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When to grow peas. Peas are a cool season crop, enjoying temperatures of 13 -18C (55-64F) so they are well suited to the UK climate. Peas can be direct sown outdoors from March to June once the soil has warmed to about 10C (50F).Using cloches will help the earliest crops to germinate.eas are a cool season crop, enjoying temperatures of 13 -18C (55-64F) so they are well suited to the UK climate. Peas can be direct sown outdoors from March to June once the soil has warmed to about 10C (50F). Using cloches will help the earliest crops to germinate.
Soil temperatures at which vegetable seed will grow include the minimum temperature required for seed growth, an optimum temperature and a realistic soil temperature. The realistic soil temperature is somewhere between optimum and minimum; it is the temperature at which you should plant to insure maximum success.For instance, the optimum soil temperature for seed germination of vegetable crops, such as cucumber, cantaloupe, okra, pumpkin, squash and watermelon, is 95Â°F.However, if planted late enough during the year for soil to reach this temperature, summer heat will decrease plant vigor and yield.he realistic soil temperature is somewhere between optimum and minimum; it is the temperature at which you should plant to insure maximum success. For instance, the optimum soil temperature for seed germination of vegetable crops, such as cucumber, cantaloupe, okra, pumpkin, squash and watermelon, is 95Â°F.