Hi Cali, I have had best success doing what Geneva has said. I always transplant now while the plant is dormant or waking up in the spring (Ontario, Canada). Careful where you plant it, I’ve found it will startle you with how it will start to take over. This takes years and year though.one year just a few plants and a few years later dozens and dozens and dozens. Side note, Yarrow really likes to be talked to when tending it 🙂 As Doc says say nice things 🙂
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