Answer: Cotoneaster apiculatus 'Tom Thumb' is a dwarf variety which grows 1-2' tall and 5' wide. The standard Cranberry Cotoneaster (Cotoneaster apiculatus) grows 3' tall and 6' wide. In either case, the nurseryman was correct. Spacing 3' apart will allow the plants to grow together into a single mound. Best wishes with your new cotoneasters!
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