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Gee64
Well-Known Member
It is, the 2 degree spread is for under ideal conditions.That's a good idea. The higher numbers are with lights out obv.
I'll keep an eye out for water use.
So, no issue with the larger delta between leaf and air temps? I figured keeping the leaves closer to what is considered ideal temps would be better than trying to match the air temps minus a couple of degrees.
76F room temp, 74F leaf temp and 48% RH, all very commonly recommended flower data points makes for a VPD of 1.40 which is ideal. But there are many ways to reach that number. Shoot for that or below. 1.2- 1.4 is great and safe.
Obviously in a heat wave thats out the windows, but raising the light and/or raising RH will both slow the plant down, allowing more water to stay in the plant longer, which will assist in cooling it.
Early in the plants day the plant will naturally raise it's own temps. First thing in the morning the plant will be warmer than ambient room temps normally, so they know what they are doing.
If you can help out with what they are trying to do they will appreciate it. Watch them at the 10 hour mark, thats when/where you make your adjustments.
Thats when they are working hardest and most likely to encounter peril. Prior to that point, don't panic unless you see obvious stress, but if they look fine and the numbers are scaring you, be patient and wait until the 10 hour mark.
Over revving the plant on a daily basis will look like a good thing at 1st, but long term you prematurely wear the leaves out and in the last 3 weeks when resins really bulk up, you won't be synthesizing optimally and your terpene profile will really suffer.
A few days of heat wave won't hurt, but you are better long term by backing them off.
In known times of stress, fish ferts and seaweed inputs really really really help reduce that stress. So if you have any liquid kelps or hydrolyzed fish ferts now is a great time to get them into the soil.