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3. There are some weed killers that will work when the temperature is 45 to 50 degrees F. and above and for 4 to 5 hours after applying. This includes Bonide âSuper Brush Killerâ â a weed killer that, when applied according to label directions, will not hurt bluegrass or turf type tall fescue grass.ome weed killers including Trimec, 2-4-D, Glysophate (Round-up, Kleen-up, and Hi-Yield Killzall II Weed and Grass Killer) do not work to maximum if the air temperature is below 55 to 60 degrees F. when applied and for 4 to 5 hours after applying.
If your grow room feels warm or cold, humid or dry, that is a sign that you may want to look into changing the temperature and/or humidity of your grow area. Generally, cannabis plants prefer temperatures in the 70-85 Â°F (20-30 Â°C) range during the day when lights are on.When lights are off (or at night), cannabis plants are happy with slightly cooler temps.ptimal Temps For Growing Cannabis. Vegetative Stage: Young growing cannabis plants in the vegetative stage prefer temps a bit warmer than in the flowering stage, in the 70-85Â°F (20-30Â°C) range. More about temps in the vegetative stage.