Q.I followed your instructions for propagating a butterfly bush, but how do I know when it is getting roots since the cuttings are in?
I do not have additional details and I do not have pictures
Downtoearthdigs
Answered on July 31, 2019
It typically takes about six weeks for a butterfly bush cutting to form roots.
https://www.gardeningknowhow.com/ornamental/shrubs/butterfly-bush/propagating-butterfly-bush.htm
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