Germination temperature
Warm crops: eggplant 24-32 °C (75-90 °F), okra 21-35 °C (70-95 °F), minimum about 16 °C (60 °F). Cool crops: lettuce 4-27 °C (40-80 °F), celery 16-21 °C (60-70 °F) (Alabama Extension).

11 growing guides
Okra, eggplant, bitter melon, onion, lettuce, celery, Swiss chard, endive, asparagus and globe artichoke: vegetables outside Deodar's tomato, pepper, pumpkin and crucifer groups.
This topic collects vegetables that do not fit Deodar's larger groups. They fall into three practical sets. Warm-season fruiting crops, okra, eggplant (brinjal) and bitter melon, need real warmth to germinate and grow. Cool-season leaf and bulb crops, lettuce, endive, celery, Swiss chard and onion, germinate in cool soil and suffer in heat. Perennials, asparagus and globe artichoke, are raised from seed in the first year and crop for several years after. Garlic is also listed, though it is normally planted from cloves or bulbils rather than true seed.
Warm crops: eggplant 24-32 °C (75-90 °F), okra 21-35 °C (70-95 °F), minimum about 16 °C (60 °F). Cool crops: lettuce 4-27 °C (40-80 °F), celery 16-21 °C (60-70 °F) (Alabama Extension).
Lettuce and celery germinate poorly above about 29 °C (85 °F), so in hot weather sow them in a cool, shaded spot.
About 2-3 times the seed's diameter; lettuce and celery are barely covered.
Temperate: cool crops early spring and late summer, warm crops indoors in spring for planting after frost. Hot climates: cool crops in the cooler months, warm crops before and through the warm season.
Lettuce and chard give pickings within weeks; eggplant and onion take a full season; asparagus and artichoke crop from later years.
Eggplant, celery, onion and globe artichoke are usually raised in modules or trays and planted out.
Okra, chard and lettuce are often sown in place and thinned once true leaves appear.
Sow lettuce and chard little and often for a steady supply.
Seedlings raised indoors need gradual exposure to outdoor conditions before planting out.
Okra (bhindi), eggplant (brinjal), bitter melon.
Lettuce, curly endive, Swiss chard, celery.
Onion; garlic is grown from cloves.
Asparagus, globe artichoke.
Eggplant and okra below about 16 °C (60 °F) germinate slowly or rot.
Seed sown in hot soil often fails to germinate; sow in the evening or a cool place.
Lettuce and celery seed needs only a light covering.
Asparagus from seed needs time to build its crown before cutting.
Pick the vegetable guide below and sow it in the season that suits its warmth needs.
Lettuce germinates poorly in hot soil above about 29 °C (85 °F). Sow in a cooler, shaded spot or in the cooler part of the year.
Not essential, but their tough coats absorb water slowly; the individual guides give the soaking advice.
Open the guide that matches the seed name on your packet.