I am in Michigan and my Moonbeam coreopsis is about 1/2 inch tall. It is in full sun. The plant dies back to the ground in winter so all above ground stems are sheared in early spring. If you are speaking about one of the larger coreopsis plants, they should be up by now up to zone 4. Look for seedlings as this plant, depending on the variety, self-sows freely. Coreopsis do not like the temperature dips of early spring so they wait until the weather has settled before emerging. If you care to repost with which coreopsis you grow and where you live, we'll try to be more specific.
Answered on May 8, 2018
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