what kind of ground covering can be planted under pine trees (acid soil) that the deer will not eat and will not attract bees?
That's a pretty big order, but Mr. SP will see what he can come up with! You can see a Fact Sheet on Deer Feeding Habits from the Maryland Cooperative Extension, Deer Resistant Perennials OH 64 from University of Vermont Extension System and also a list of Deer Tolerant/Resistant Native Plants from Bowman's Hill Wildflower Preserve in New Hope, Pennsylvania. Ferns are on all the lists among the plants mentioned that deer avoid. Since ferns aren't flowering plants (they reproduce from spores) they aren't going to attract bees. Ferns generally like acidic soil and many of them are evergreen. There are several choices for ferns that grow in Pennsylvania. Here are some recommended fern species that are evergreen and grow in acidic soils:
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