Aster is a genus of flowering perennials that consists of about 180 different species. The name aster is taken the from the Latin word astrum, which means “star.” The plant was named such because of the star-like appearance of the aster flowers. Asters grow to between 2 and 3 feet in height, and bloom during late summer and early fall. The aster flowers can be white, purple, pink or red in coloration.
Planting
Plant aster seeds in a location that receives between six and eight hours of direct sunlight each day. Spread 1 to 2 inches of organic compost over the planting site, and use a garden tiller to incorporate it into the soil to increase drainage and raise fertility. Always plant early in the spring, just after the danger of frost has passed to ensure the aster plants are established before summer. Water immediately after planting to initiate growth.
Watering
Water your garden aster once a week, never allowing the soil to dry out completely. Increase watering to two to three times a week during weeks that receive no rain fall. Take care not to splash water onto the foliage of the growing asters, as moist leaves are susceptible to fungal diseases.
Fertilizing
Feed asters once a month using a balanced 10-10-10 NPK fertilizer. Do not allow any fertilizer to come into contact with the plant, as the excessive levels of nitrogen can burn foliage. Water thoroughly before and after fertilizing to release the nutrients into the soil. Follow the manufacturer's directions for proper application and dosage.
Mulching
Spread 1 to 2 inches of organic mulch around the stems of the aster flowers. Use shredded cedar mulch, which is effective at conserving moisture, suppressing weeds and repelling insects with its fragrance. Leave at least 2 inches between the stem of the asters and the mulch to allow plenty of room for growth.
Pruning
Deadhead any faded or dying aster flowers to conserve nutrients and encourage the plant to produce more blossoms and foliage. Deadheading is the process of pinching dead flowers off near the stem to prevent the plant from using excess nutrients to keep the flower alive. Cut growing asters back by about half of their size in mid-July to encourage the flowers to grow in a more compact manner. This is optional, and is only required if the size of aster flowers must be regulated. Cutting back asters delays blooming time by four to seven days.
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