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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.

A dead tree should always be cut down, because it could fall and cause injuries or damage, and it can also attract insects like carpenter ants. A tree that’s diseased beyond repair should also be cut down, but it’s not always easy for a homeowner to tell. Signs of disease include dying branches, a hollow trunk, leaning, and discolored or missing leaves, but your best bet is to hire a local arborist who can evaluate the tree and tell you if it can be saved or should be cut down.

If you’re wondering whether you can plant a tree where the stump was removed, know that the soil conditions won’t be ideal, so you should avoid it. The soil beneath the previous tree will likely be depleted of nutrients, plus there may be roots left behind that will seriously hinder the growth of a new tree. Also, if you use salt or other chemical solutions to kill the stump, these can linger in the soil for months or even years and prevent healthy growth. It’s best to choose a different spot that’s at least three feet away for a new tree, or wait at least a year and thoroughly amend the soil before you plant.

Pruning trees during the summer can be a bad idea because the new growth will take place during the hottest months of the year, which can stress your tree out. Similarly, pruning during the early fall can be a bad idea, too, because you’d be stimulating new growth when most trees are aiming to go dormant. 

Pruning recommendations will vary by the type of tree, but generally, waiting until winter to prune your trees is a good idea.