Sometimes a plant jumps over the line after I put it in the ground, but I don't think of plants I'm cultivating as weeds. If it's pretty &/or I see bees, butterflies, or hummers visiting it, I usually leave it alone, at least until the blooms are finished.
Some plants are "weedy" but don't bother me if they're easy to dig out of the way, like spiderwort and violets. These natives are welcome between bought and propagated plants unless/until I want their spot, then I pop 'em out and pop the other plant in its' place.
