<https://orchardnotes.com/2021/06/03/check-grafted-trees-rootstock-regrowth/#schema-comment-305>
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"Hi Peter - \n\nI'm not as confident on cherries, especially blossom cherries, as I might be for apples or pears, but it does sound like a sucker from the base has taken over. If the tree isn't on a rootstock and is growing on its own roots, then the sucker should be the same variety as the old top-growth and may just take over in time, when the wood is mature enough to set blossom. Without knowing whether or not it's a grafted tree though, it's difficult to say for sure. Fingers crossed"
<https://orchardnotes.com/2021/06/03/check-grafted-trees-rootstock-regrowth/>