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You should prune ornamental trees once every other year after the fruit has matured and begun to drop. You should also prune out dead branches whenever you see them. Pruning too often can stimulate more growth, especially in faster growing varieties like Bradford pears.

Most trees can be successfully transplanted while they are young, but pines, walnuts, and some oak tree varieties are more difficult to move because their root systems grow deeper than most other trees. Also, trees adapted to sandy soil with wide root systems like beeches, willows, and aspens are harder to dig out because their roots spread much farther out from the trunk. In these cases, unless the trees are very young and small, it’s a good idea to consult a tree planting professional.

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.

You can use herbicides to prevent roots from growing without killing the tree itself, however they must be used with caution. Systemic herbicides are absorbed by the root and can kill off problematic roots. However, herbicides can sometimes negatively impact nearby plants, so the solution is best used sparingly.