Pruning a branch with shears.
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Why Pruning Your Garden
In The Summer Heat Is A
Big Mistake
Pruning or thinning plants in high heat exposes the remaining healthy parts to the sun, making them more vulnerable to injury, losing leaves and flowers.
As tempting as it is to remove dead leaves, they're protecting the healthier portions of the plant. Dying leaves still go through photosynthesis and can be useful.
Pruning stimulates new growth, and new growth is soft and vulnerable to heat. Cutting away in the heat increases the probability
of heat damage for the growing parts of the plant.
Pruning simply opens up wounds, allowing precious water to evaporate faster. They also make the foliage more likely to be harmed by diseases or pests.