Seed Germination soil Temperatures

Standard
In general, it is better to sow your seeds a little late rather than too early.  If the soil temperature is not warm enough for the variety of seed you are sowing, the seed will often rot in the ground before it has a chance to germinate.  This is especially true with seeds that have not been treated with a chemical fungicide. ( We do not recommend using treated seeds).
Remember – the temperatures listed below are for the soil, not the air.

In the spring,  the air temperatures may be warm for a few days, but this will have little effect on the soil temperature.   Only when the days and nights both stay warm for an extended period of time will the soil temperature start to rise.

 

VARIETY OPTIMUM SOIL TEMPERATURE FOR GERMINATION DAYS TO GERMINATE AT OPTIMUM SOIL TEMPERATURE
Bean, lima 85 degrees F 7 to 10 days
Bean, snap 75 to 80 degrees F 7 days
Beet 75 degrees F 7 to 14 days
Broccoli 65 to 75 degrees F 5 to 10 days
Brussels sprout 68 to 75 degrees F 5 to 10 days
Cabbage 68 to 75 degrees F 5 to 10 days
Cantaloupe 80 to 85 degrees F 5 to 10 days
Carrot 75 degrees F 12 to 15 days
Cauliflower 65 to 75 degrees F 5 to 10 days
Celery 70 to 75 degrees F 10 to 14 days
Collard 70 to 75 degrees F 5 to 10 days
Corn 75 to 85 degrees F 7-10 days
Cucumber 70 to 85 degrees F 7 to 10 days
Eggplant 75 to 85 degrees F 10 to 12 days
Endive 70 to 75 degrees F 10 to 14 days
Kale 70 to 75 degrees F 5 to 10 days
Kohlrabi 70 to 75 degrees F 5 to 10 days
Lettuce 65 to 70 degrees F 7 to 10 days
Melon 80 to 85 degrees F 5 to 10 days
Mustard Greens 70 degrees F 5 to 10 days
Okra 80 to 85 degrees F 7 to 14 days
Onion, bulbing 70 to 75 degrees F 10 to 14 days
Onion, bunching 60 to 70 degrees F 10 to 14 days
Parsnip 70 degrees F 14 to 21 days
Pea 65 to 70 degrees F 7 to 14 days
Pepper 78 to 85 degrees F 10 to 14 days
Pumpkin 70 to 75 degrees F 7 to 10 days
Radish 65 to 70 degrees F 5 to 7 days
Rutabaga 65 to 70 degrees F 7 to 15 days
Spinach 70 degrees F 7 to 14 days
Spinach, New Zealand 75 degrees F 10 to 15 days
Squash, Summer 75 to 85 degrees F 7 to 14 days
Squash, Winter 75 to 80 degrees F 7 to 14 days
Swiss Chard 70 to 75 degrees F 7 to 14 days
Tomato 75 to 80 degrees F 7 to 14 days
Turnip 65 to 70 degrees F 7 to 14 days
Watermelon 75 to 85 degrees F 7 to 14 days

 

Information provided by: http://www.heirloomseeds.com

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s