How long does alyssum last for and is it perennial or annual plant?
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Sarinasala1
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It is an annual that will keep flowering. Here's a link with the details:
https://www.thespruce.com/how-to-grow-sweet-alyssum-1402862
In our area, the Midwest of USA it is an annual... it last until frost.
Depending on where you live it is an annual and usually requires planting every year. It spreads and blooms all summer.
Annual but will self sow/reseed so it will continue to regrow