The answer to 'tree trimming has weeds' is that improper tree trimming can lead to the growth of weeds around the tree. When trees are trimmed incorrectly or too aggressively, it can damage the tree and create openings in the canopy that allow more sunlight to reach the ground. This increased sunlight then promotes the growth of weeds and other unwanted plants around the base of the tree.
To prevent this issue, it's important to have your trees trimmed by a professional arborist or landscaper who can properly prune the tree without damaging it. They will know how to selectively remove branches to maintain the tree's health and shape without creating large openings in the canopy. Proper tree trimming should be done every 2-3 years, depending on the tree's growth rate and needs.