re: Grass/ground cover suggestion for yard with huge Oak trees...

quote:

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Do this if you want to kill the oak trees... oak roots need to breathe.

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That is only true for specific types of oaks generally found in the western areas of the country. The majority of oaks will be fine.

But it is a requirement (4" bare minimum) if the goal is to grow grass under the canopy. If not, then no grass which was the original question.