WHEN TO SET OUTSIDE
Plant out in springtime after all danger of frost has passed or in early autumn.
PLACEMENT & CULTIVATION
Plants that provide late season sustenance to pollinators, especially Monarchs, are valuable additions to wild areas and borders, as they are adaptable to all but dry, poor soils. Site in the mid-to-back border where other plants can hide their bare "shins." Pinch back a few times before July to encourage bushiness and control height (remember this will also delay flowering a bit). Cut back after flowering if self-sowing is unwanted or if the plant foliage is becoming unsightly. This aster is host to the caterpillars of the pearl crescent butterfly and provides pollen for specialist bees and bumblebees. The flower stalks are a suitable nesting site for native bees.
Watering Details:
Water regularly, about 1" a week, but do not overwater—they are also somewhat drought tolerant, but extremes will reduce blooms.
Soil pH:
This plant can grow in a variety pH levels, but prefers one which is slightly acidic.
Fertilizer:
Mix in 1" of compost in poor soils. Topdress with about a half inch of compost, repeating annually in early spring, or mix in an application of organic granular fertilizer.
Diseases & Pests:
Prevent powdery mildew by placing in full sun with plenty of airflow. Thin stems of established plantings to increase air circulation.
When to Cut for Bouquets:
Harvest when flowers are fully open.