Alpine Milkvetch

Alpine Asters should be watered deeply but sparingly during the active growing season, which is usually from May to September. Water the plants until the top 4 inches of the soil is moist and then allow it to dry out slightly before watering again. It is important to not water too frequently or the plant will become waterlogged and the roots will rot. In the winter, water very sparingly or not at all if possible.

Alpine Asters require full sun to partial shade with 5 or more hours of direct sunlight each day. These plants should be protected from the hottest part of the day in areas with intense direct sunlight. They prefer cooler conditions with the temperatures ranging from 32- 50 degrees Fahrenheit. When the temperatures reach beyond this range, Alpine Asters should be provided with shade or protection to ensure their best growth and production of blooms.

Alpine Aster should be pruned annually in late spring or early summer. This encourages the bushier growth which is characteristic of the species. Pruning should involve cutting back the flowering stems to roughly 1 third of their length. The remaining stems should be nicely shaped into an attractive, dense bush. Careful pruning will also help encourage more flowers in the upcoming season. Dead or laterally sprawling stems should be removed from the base. After pruning, the remaining stems should be surrounded with a layer of mulch to protect the plant from extreme temperatures.