MichiganDot
Answered on July 5, 2018
It is likely that you have alyssum seeds in your soil and they will continue to pop up when conditions are right for several years. Make sure you don't allow this year's plants set seed! I suppose a pre-emergent herbicide would suppress germination of those seeds but that seems excessive given how easy it is to pull/hoe the plants when they appear. It's up to you.
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