[Market-farming] Seedling growth vs temps

cjmaness at juno.com cjmaness at juno.com
Thu Jan 10 11:50:45 EST 2008


In my greenhouse at least, if the temps get too high I start seeing a lot of stretching with my plants. It's a fine line. They do grow faster warmer, which is nice, but I want a nice sturdy transplant in the field.
With tomatoes, I believe it is the fluctuation between day and night time temps. If I remember my hort. classes correctly, I think it's like 10 degrees difference is considered optimum? Ideally tomatoes would grow at 65 during the day, and 55 at night. My little homemade greenhouse can't do that. It's always too hot during the day, but we can manage night time temps. fairly well. And, I have cool spots and hot spots so I'm always moving things around. Hot spots to speed up germination and then moving to the cooler end for growth.
Once tomatoes are in the field, the cool weather can cause cat facing, and reduces the production and viability of pollen. Some varieties seem to handle all of that better than others, but I'm still at the trying to figure it all stage myself!
Carla, zone 7 Oklahoma 
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