Scientific research has shown that the pruning sealer is not necessary. ... It is also wise to minimize pruning in landscape trees by training a tree when it is young. Cutting small branches when the tree is young precludes the necessity to cut larger branches later.

Do I need to seal after pruning?

In most cases, it is best to simply let wounds seal on their own. ... Instead, they compartmentalize wounds with layers of cells that prevent damage from spreading any further. A properly pruned tree or shrub will seal off wounds and prevent decay organisms from entering the trunk.

Should pruned trees be sealed?

Should you seal pruned limbs at all? The short answer to this is no! You should not use pruning paint to seal pruned limbs at all. They are better left to undergo natural healing through their own plant defense mechanisms.