Answer: Oaks aren't usually considered shallow-rooted trees -- where conditions allow, they send their roots deep. There may be an underlying factor that's causing them to favor the soil surface, such as a shallow bedrock layer under the soil, high water table, soil compaction, and the like. If this is the case, any tree that you plant will grow shallow roots. I suggest that you have a landscaper or arborist take a look at your site and assess what kind of tree is likely to be compatible with the conditions in your yard before spending a lot of money and energy in tree removal and replacment -- it'll be worth the front-end investment!
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