Seeds require water and certain temperatures to grow. Different seeds require different temperatures. Some even need a period of extreme cold (vernalisation) before they will germinate.
The time the seed takes to sprout (the germination time) varies with the season, which effects the soil temperature. In an early, warm spring, the soil will warm up faster than in a cold, late season.
It is therefore difficult to predict how long it will take for seeds to emerge. But, as a rough guide, vegetable seedlings will emerge within this number of days in the right conditions:
Aubegine 10-12
Beans (runner & french) 7-10
Beetroot 10-14
Broad beans 10-14
Broccoli 6-10
Brussels Sprouts 6-10
Cabbage 6-10
Carrots 10-21
Cauliflower 6-10
Celery 10-14
Courgette 5-8
Cucumber 7-10
Eggplant 10-12
Endive 10-14
Kale 5-10
Kohlrabi 5-10
Leeks 10-14
Lettuce 6-10
Marrow 6-10
Melon 5-10
Mustard Greens 5-10
Onions 10-14
Onions (Spring) 10-14
Parsnip 21-28
Peas 7-10
Pepper 10-14
Pumpkin 6-10
Radish 5-8
Spinach 14-21
Squash 6-10
Swedes 6-10
Sweet Corn 6-10
Swiss Chard 7-14
Tomato 10-14
Turnips 6-10
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