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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.

If you want to take your tree-planting hobby beyond your outdoor space, here are a few great ways to do it:

• Encourage your neighbors to participate in the Arbor Day Foundation’s Tree City USA program, which has a four-step framework that helps communities grow and maintain their own tree cover.

• Support businesses that plant trees. 

• Lobby your local government to plant more trees around your community.

• Donate to a tree-planting charity.

For safety reasons, leaning trees are best removed by a professional, as they may often tear away from the hinge, causing you to lose control over where the tree falls. If you choose to cut down a tree leaning slightly, avoid cutting off root protrusions before you start. Make your hinge a little longer than usual by cutting it deeper (up to 30% of the diameter) and applying a wedge into the felling cut on the side the tree is leaning. Stand away from the direction the tree leans while making your felling cut.

If you don’t cut down a dead, dying, or diseased tree, it can become a nesting place for pests like mosquitos, bees, beetles, wasps, fly larvae, and more. Some pests will live in the tree, while others will feed off the decaying wood. Unhealthy trees are also more likely to fall over, potentially injuring people and causing damage to your property.