Germination Info & Soil Temp

See links below from Harvest to Table.com with plant-specific advice including soil temps.


Min/Opt/Max temps from IFAS

MINIMUM Soil Temperature for Germination

  • 32° – Endive, Lettuce, Onion, Parsnip, and Spinach
  • 40° – Beet, Broccoli, Cabbage, Carrot, Cauliflower, Parsley, Pea, Radish, Swiss Chard, and Celery
  • 50° – Asparagus, Sweet Corn, Tomato, and Turnip
  • 60° – Lima bean, Snap Bean, Cucumber, Okra, and Pepper
  • 65° – Eggplant, Muskmelon, Pumpkin, Squash, and Watermelon

OPTIMUM Soil Temperature for Germination

  • 70° – Celery, Parsnip, and Spinach
  • 75° – Asparagus, Endive, Lettuce, and Pea
  • 80° – Lima Bean, Carrot, Cauliflower, Onion, Radish, Tomato, Turnip
  • 85° – Snap Bean, Beet, Broccoli, Cabbage, Eggplant, Parsley, Pepper, Sweet Corn, and Swiss Chard
  • 95° – Cucumber, Muskmelon, Okra, Pumpkin, Squash, and Watermelon.

MAXIMUM Soil Temperature for Germination

  • 75° – Celery, Endive, Lettuce, and Spinach
  • 85° – Lima Beans, Parsnip, and Pea
  • 95° – Asparagus, Snap Bean, Beet, Broccoli, Cabbage, Carrot, Cauliflower, Eggplant, Onion, Parsley, Pepper, Radish, Swiss Chard, and Tomato
  • 106° – Cucumber, Muskmelon, Okra, Pumpkin, Squash, Sweet Corn, Turnip, and Watermelon

From Harvest to Table.com

VEGETABLE SEED GERMINATION SPECIAL REQUIREMENTS

SEED STARTING SPECIFIC CROPS

VEGETABLE SEED GERMINATION TEMPERATURES

CropMinOptimumMax
Asparagus5060-8595
Bean, lima6075-8585
Bean, snap6075-8595
Beet4060-8595
Broccoli4060-8595
Brussels sprouts4060-8595
Cabbage4060-8595
Carrot4065-8595
Cauliflower4065-8595
Celery4060-7095
Chinese cabbage4060-8595
Collards4060-8595
Corn5065-95105
Cucumber6065-95105
Eggplant6075-8595
Endive/Escarole3560-7585
Garlic3565-8595
Kale4060-8595
Kohlrabi4060-95105
Leeks3565-8595
Lettuce3560-7585
Muskmelon6075-95105
Mustard3560-7585
Okra6085-95105
Onion3565-8595
Parsley4065-8595
Parsnip3565-7585
Pea4065-7585
Pepper6065-7595
Pumpkin6085-95105
Radicchio3560-7585
Radish4065-8595
Spinach3565-7575
Squash6085-95105
Swiss chard4065-8595
Tomato5065-8595
Turnip4060-95105
Watermelon6070-95105
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