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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.

In nature, there are many things that can cause a tree to die, including diseases, insects, and natural disasters such as fires or droughts. Non-natural methods of killing a tree include herbicides or manual intervention, such as cutting it down. Consult a tree removal professional about your options for naturally killing a tree.

Whether tree roots will continue to grow after a tree has been cut down depends on the species. Some tree roots will eventually die because they can no longer get nutrients through photosynthesis. However, other species that reproduce through root sprouts can continue to grow and produce new sprouts for seven years or more. For example, the roots of elms, ficus, and willows tend to regrow aggressively, while the roots of pines, oaks, and maples will typically die. To determine if a root system is still active, look for new sprouts on the old trunk, stump, or any exposed roots.

Pruning can impact cold hardiness—but it’s less about the exact temperature and more about temperature variation. Generally, you don’t want to prune trees when there’s a risk of temperatures suddenly dropping from 50 to 60 degrees Fahrenheit to 0 degrees Fahrenheit or below. A tree is most sensitive until 48 hours after it’s pruned.