G.D.D. - Upper limits ??

Post Reply
Message
Author
TechnoCaveman
Posts: 2
Joined: Fri May 22, 2020 7:33 pm

G.D.D. - Upper limits ??

#1 Post by TechnoCaveman » Fri May 22, 2020 7:44 pm

Are there any upper temperature limits for Growing Degree Days?
Plants survive 104F / 40C tempratures. However much higher temperatures can break down the wax coating on leaves killing the plant.

Reason for question: newbie planting seeds with a black seed starter box. I would like to ensure the heritage seeds are not fried before they spout.
Once sprouted, I do not want to kill them. Additional / replacement seeds from Amazon are arriving "June 8 to July 10" from "Sold by: jiuytok" They were ordered over a month ago.

TechnoCaveman
Posts: 2
Joined: Fri May 22, 2020 7:33 pm

Re: G.D.D. - Upper limits ??

#2 Post by TechnoCaveman » Mon May 25, 2020 11:43 am

Update: While 77F is the optimal temperature for photosynthesis, its been rather chilly at night 60F for new seeds.
I put them in the oven and turned it on for one min to warm the oven up to 80F. I do not want to go much past that. I am hoping that helps spur them on.
Next step is to get a 15W lightbulb, non LED, to make a warmer like an incubator. The book "Dirt to Soil" speaks of healthy soil being warm like a compost pile.

Post Reply