Answer: If you look carefully, there are never precise changes in habitat or vegetation in nature because different plants have different requirements in terms of growing conditions. What you are seeing is a naturally occurring buffer, often used by wildlife as cover, and part of nature's way of easing the transition at the edge of a wooded area. If you are determined to make an abrupt line, you will need to eradicate the seedling trees and shrubs. Repeated cutting at ground level will eventually work for most of them, but you may also find that carefully timed applications of an herbicide containing glyphosate are helpful. Be sure to use a concentration for brush and follow the label instructions carefully. Keep in mind too that this is a contact herbicide and will kill desirable plants if it contacts them by accident. Regular mowing of the lawn edge should them help to keep the encroachment at bay, although it tends to be an ongoing battle.
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