The last couple of years by covering my garden with just a tarp or heavy plastic everything returns including guaranitica, many greggii and agastache. The only exception was david verity. It was an experiment and maybe I covered too late for that one but overall the method works. I would also think that any plants separate from the others would work with a bag of leaves for anyone in colder climates.
Heat zone 6
Sunset zone 35
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