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"Garden Can't Compete with Tree's Roots and Shade" Q. We have recently built a series of raised beds for our vegetable and berry garden. They are in our prior in-ground garden area which is near an oak tree and one of the beds is partially under the drip line of the tree. Some friends who had a similar situation said they had a major problem with invading roots leaching the nutrients and clogging the beds. What can we do to prevent this from happening to ours (other than moving the beds)? We do have a small tractor with a 12-inch back hoe, so could do digging if that would help. Thank you. A. If you were to do a major digging you could hurt the tree. A tree's drip line is the area on the ground below the outermost edge of the branches and that is where the tree's feeder roots are concentrated because that is where the rain can reach the ground readily. Another concern is putting too much soil over the surface roots of the tree. To avoid hurting the tree, I recommend not putting more than one inch of soil over the area per year. If your raised bed is small, that may not pose a problem to the tree, but if the raised bed covers a large area that would not be good for the tree. You mentioned you want to grow vegetables and berries in the area under the tree. Most vegetables and berries grow best in full sun and in that area under the tree they will not be in full sun, and depending on how big the tree is now or in the future, the garden might be shaded so much that the vegetables and berries won't do well. Additionally, as I've already mentioned, there will be significant competition for sun and water and the tree's roots will grow into your garden's soil seeking fertile ground. Any watering and fertilizing you do in that area will also be used by the tree. It's a difficult situation no matter how you look at it. If you do not want to remove the tree or are unable to transplant it, you might want to consider locating that raised bed to an area away from the tree. If you are not able to relocate the raised bed you might need to trim branches off the tree over the garden. Also, over the years you will have to cut away tree roots that have grown into the soil of the raised bed. I have a similar situation in the raised beds of my vegetable garden and because I use a rototiller to cultivate the soil I need to regularly cut away tree roots that have grown into the raised beds.
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