Campanula, Serbian Bellflower, Trailing Bellflower 'Blue Waterfall'

I have 2 of these plants under a redbud tree with salvia and creeping phlox in Kentucky. It looks like a slow spreader and definitely pre...Read Morefer sun. The patch that is in shade has not speead as wide but I am ok with that. It may be contained by the creeping phlox but I did notice that it sends out long plants that may set roots where it touches the ground. It's not spreading quite as fast as I would like.

This plant is surprisingly hardy in hot, dry inland San Diego County. It is doing all right with twice a week watering. It's good in su...Read Moren but seems to prefer a bit of shade. We have it in pots and in the ground. It forms pretty mounds of foliage and delicate purple flowers. The snails seem to like it, and they'll demolish and entire Bellflower plant in an evening, unfortunately. The plants have sprung up where I didn't plant them; I don't mind that, but others might.

Is this plant invasive for you? In its second year on a border in my Zone 6 garden it has doubled the area that it occupies. Duration o...Read Moref blooming good and long.