If you want to speed things up, you can try this (it’s worked for us before): Along the ‘bare side’ of the stem, make several horizontal cuts with a pruner or sharp knife. Just enough to cut through the bark and into the cambium. If you can make these cuts at or near nodes, or early buds, on the stem, these cuts may promote sprouting along the stem. These sprouts can then be trained into branches.
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Welcome! I’m Margaret Roach, a leading garden writer for 25 years—at ‘Martha Stewart Living,’ ‘Newsday,’ and in three books. I host a public-radio podcast; I also lecture, plus hold tours at my 2.3-acre Hudson Valley (NY) Zone 5B garden, and always say no to chemicals and yes to great plants.