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In most cases, you should not use a pruning seal on trees after trimming. Applying a sealant can interfere with the tree's natural healing process, and it does not guarantee protection from pathogens. Instead of sealing the cut, the best practice is to support the tree's natural recovery by providing it with plenty of water and a dormant-style fertilizer. However, there are exceptions. Pruning seals may be recommended for very vulnerable species, like elm trees, in areas where dangerous diseases such as Dutch elm disease are prevalent. In these specific situations, the protection offered by a sealant can outweigh its downsides. For advice tailored to your situation, especially after cutting large branches, it is best to consult a local tree trimming professional.

The ideal depth of a tree notch depends on the tree, but it should usually be between 20% and 25% of the tree’s depth. However, if the tree is leaning towards the direction of the notch, it can be cut more shallowly—at as little as 10% of the depth. When the tree is leaning away from the direction it needs to be felled, you can cut deeper, closer to 30%.

The best time to prune Japanese flowering cherry trees depends on where you live and the type of flowering cherry tree. Some trees benefit from being pruned toward the end of winter or early spring, after the last freeze. Meanwhile, other trees do well after blooming, in late spring or early summer. Avoid pruning your flowering cherry tree in the early winter, as this encourages open wounds that can lead to infections or infestations. 

If an arborist is certified by the International Society of Arboriculture (ISA), the highest level of certification available is ISA Board Certified Master Arborist. According to the ISA, this credential is reserved for arborists “who have reached the pinnacle of their profession.” Check your arborist’s credentials before hiring to confirm their level of training and expertise.