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reesepbuttercup

Spacing for Sunny Knockout hedge?

I know Sunny Knockout isn't a fan favorite here, but I think it will work for my space and I actually like the simple, yellow to white blooms. Anyway, I'm trying to create a semicircular hedge. I have three sunny knockouts planted about 2.5 feet apart. Is this close enough so that in another year or two they will grow into a hedge? Or should I pick up two more and have them closer together? Here are some photos, excuse the junk everywhere... this landscaping project will never end

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