Answer: Bee balm can spread tremendously by sending out roots so you need to allow it plenty of space and be prepared to divide it (or shovel prune it) regularly. This can be done spring or fall as can transplanting of it. The yarrow may also be a spreader depending on what kind you have -- some forms are consistent clumpers. This plant can also be divided spring or fall. The Shasta daisy is better moved or divided in early spring just as it begins to grow for the year. Enjoy your hummers!
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