Endless Summer® blooms on old and new wood. It's a heavy bloomer with blue, purple, or pink flowers, depending on acidity of soil. Best in afternoon shade, growing 3-5' tall and wide. To ensure early blooms from old wood, try dumping a bag of mulch in the middle of the plant in November, before really cold weather to protect some of the lower buds. Wait until late April to pull back the mulch and trim the stems back to a few buds. Hardy to Zone 4.