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A general rule is that trees need 10 gallons of water for each inch of the tree’s diameter. For large trees, that can amount to approximately 160 gallons of water or more. Watering big trees to this extent can take quite a bit of time using a hose. For this reason, you may consider installing a soaker hose or sprinkler system to make the job easier.  

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.

Pruning trees is important for several reasons. It improves tree health and strength by removing dead, diseased, or unwanted branches, which in turn encourages new growth and can help treat disease. For fruit trees, proper pruning can lead to a larger and better-quality harvest. Pruning also enhances safety by removing weak limbs that could break and fall, potentially causing injury or property damage, especially during storms. Beyond these functional benefits, pruning can also improve a tree's appearance. To ensure pruning is done correctly for the tree's long-term health, consider hiring a professional.

Since overwatering can harm mature trees just as much as a lack of water, it’s important to know the signs of an overwatered tree. If your tree’s leaves are yellowing, wilting, or dropping leaves, it’s likely that you’re overwatering. Other common signs include rotting, fungi, soggy soil, soft or peeling bark, falling leaves, and brittle roots. 

If you realize that you’ve been overwatering your mature tree, stop watering and give the soil time to dry out. Then moving forward, increase time between watering sessions.