Do water oak trees kill grass when they foliate?
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All oak trees create a lot of shade. Unless you have shade tolerant grass, yes, it will kill the grass when it leafs out.
Any tree will kill grass due to loss of light to the grass when in leaf.
Grass and Trees are not a good combo -- try a shade loving ground cover --- no mowing! and most stay 'green' all winter .. depending on your 'zone' https://www.gardeningknowhow.com/ornamental/groundcover/gcgen/ground-covers-under-trees.htm