Answer: I'd be really cautious of building anything beneath your oak tree. Changing the soil level can kill the roots, as can planting anything beneath it. I'm afraid the best solution is to rake up or vacuum up the acorns in the fall when most of them have dropped. You might be able to install weed barrier landscape fabric under the canopy of the tree to stop acorns from sprouting or at least from rooting in the soil. You can top the weed barrier with an inch or two of bark to disguise it. Weed barrier fabric has tiny holes that allow moisture to trickle through but blocks sunlight so seeds won't sprout. Hope it works for you!
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