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How close to plant Raydon's favorite aster, Sheffield Pink mum

I'm planning to put in some Radyon's favorite asters and Sheffield Pink mums next year. I'm not sure how far apart they should be. Online sources say they get 2-3 feet wide. Should I cluster them together so the appearance is more packed and unified (maybe 2' apart) or should I give them the full 3' recommended? I would like an appearance where you can't distinguish each individual plant, but I don't know if they do well closer together.


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