Knock Out roses and Russian sage combines and underplanting Whitespire birch. Pink roses planted with nepeta Walkers Low. Climbing rose interplanted with white clematis. Among plants I have seen successfully used as underplantings, borders, and interplantings are plants with a gray/green to gray/blue hue. They tend to be heavily scented, often members of the mint family. They should be broad-leaved versus grasses so you could use a herbicide for encroaching grasses, if you prefer. Weeding is…
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