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Indian Hawthorne and Hamlin Fountain Grass are not hardy in Zone 6. Nandina is doubtful.
At some point, nearly every shrub needs some maintenance. If you have large open areas, some junipers and hollies could work along with the Manhattan Euonymus. If they can let things naturalize, and not shear the shrubs, the maintenance will be less. That said, many deciduous, flowering shrubs could fill areas and provide color interest.
This is a case for using the right shrub in the right place to reduce the need for constant maintenance.
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