We have two prunus amanagowa which have spread (presumably by suckers?) and are appearing in the borders. Do we have to dig these out and how can we stop this happening again?
If the rootstock is damaged, they will send up suckers. Pull them off if you can. They will be a common cherry rootstock, not the Amanogowa, grafted on top.
You don't stop doing new things because you get old, you get old because you stop doing new things.
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Wisdom is not putting it in a fruit salad.