Harvest then revegg

Ive heard u can havest most of your canna. leaving branches and olny the popcorn bud
(I harvested just as revegging started, i.e new little bud growth) and then take clones from the new growth from the small nugs, is this correct, how long does the new growth take to bcome sufficent to clone? will the branches bare of bud begine to produce leaves or new growth?
 
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