MichiganDot
Answered on May 22, 2019
Spring or fall is ideal for dividing and planting perennials. It should have about 6 weeks to get new roots going before stress from summer heat or winter cold hits. It is possible to plant in summer but extra precaution needs to be taken. Protect new summer plants from harsh sunlight by rigging up some shade for 2-3 days. This could be a paper bag attached to a stick, a box placed over the plant with the top and bottom open or another method, depending on what you have on hand.
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