Actually, depending on the species or hybrid parents of the plant, the roots can start growing at different times. Some grow as the plant grows. Some grow roots when the plant is half grown. And some even growq roots after the plant has flowered. They're all different. For plants with no roots, you can get good results from hanging the plant in a jar with water in the bottom just below where the roots would be. Laid on a bed of sphagnum moss dampened. Placed in an open ziplock bag with some damp moss. Lots of ways. I take the plant and dip it in water every day to help give the leaves some moisture. But usually if the plant grew roots and then lost them, chances are it won't grow more roots.
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