Tip #1: Watch for the Signs of Heat Damage
If Blue spruce overheats, there may be warning signs before it begins to die off. First, the leaves may begin to brown, then branches could begin to fall off. This is because the branches themselves are dying as the tree pulls moisture back towards its center of mass. Make sure to keep temperatures lower, and water your Blue spruce more frequently if they are exposed to heat.
Tip #2: Don’t Let Blue spruce Get Too Cold
While Blue spruce does prefer cooler environments, letting the temperatures drop too fast can begin to cause freeze damage. If your growing area dips fast below 5℉(-15℃), the water in your Blue spruce can begin to freeze. This causes the cell walls to burst and the bark to crack. This could slow growth significantly, and if temperatures don’t increase, may begin to cause parts of Blue spruce to die.
Tip #3: Use Shade and Ventilation to Help Keep Temperatures at the Right Level
If you find that Blue spruce is starting to overheat, you can use a combination of shade and ventilation to help bring temperatures back down. If you don’t have access to an air conditioning unit or fans, shade and ventilation are a good cost effective way to bring temperatures back into the optimal range. Once temperatures are corrected, though, make sure to let your plants get sunlight. Blue spruce needs a lot of sun to grow properly, so while shade could work in the short term for temperature correction, Blue spruce should not be left in the shade for too long.