Answer: There are several groundcovers you might try; their success and speed of growth will depend on how dry the soil is under the trees. English ivy (Hedera helix), creeping myrtle (Vinca minor), and Epimedium should all do fairly well. I would expect the soil to be too dry for ferns to thrive without supplemental watering. Whichever plants you try, to increase their coverage rate you should be sure to amend the soil with ample amounts of organic matter such as compost, rotted leaves, or aged stable manure and bedding and plan to water them regularly until they are well established.
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