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Mulch the planting area with a 2-inch-deep layer of finely ground pine or hemlock bark.
Growing in the bare sand areas favored by lupines are other unusual plants such as ground pine and pale grey-green patches of reindeer moss lichen, as well as the red-topped british soldier lichens.
Lucerne Media, 37 Ground Pine Road, Morris Plains, NJ 07950, (800) 341-2293.