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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.or a lot of indoor growers, that is all you need to worry about. If it feels too hot or too cold for you in your grow area, itâs probably too hot or too cold for your cannabis plants as well. Cannabis plants like about the same temperature as humans do!