This video shows the process where you can take root cuttings from perennials that are not hardy to your zone and save them off for next year. Someone mentioned it was probably incorrect for me to call them annuals and I’d agree with that! These are cuttings from perennials that are annual only in that they’re not hardy to our zone.
Do you have questions about what your hardiness zone is? Here’s a good map that we often use for discussions:
https://planthardiness.ars.usda.gov/
Updated title and hope this description clarifies. This method would not be something you’d do with true annuals which would die off every year.
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Mmm… not sure if the problem is with your theory or your title. There are annuals and there are perennials (and also biennials)… and then there are perennials that are very frequently grown as annuals depending on the zone you live in.
A true annual completes it life cycle in a single growing season and no amount of light, heat or rooting hormone is going to extend that.
I think it’s important to note that, because even if someone had the necessary heated space and lighting setup to sustain plants thru the winter, if they tried this with something like squash, which is a true annual, it would just die and they would believe it was a failure on their part.