Depending on the variety, Echinacea plug plants should be spaced 16-24" apart; this spacing will encourage airflow and help prevent Pythium, Botrytis, and Phytophthora. Echinacea are known to be rugged, problem-free plants, but Thrips, Aphids, whiteflies and slugs may be attracted to them. Do not pinch Echinacea, it is single-stemmed and will not bloom if pinched. Allow the plants to dry out slightly between irrigations; the best watering practice is to water in the morning to prevent sending plants into the night cycle with water on the foliage, which can lead to crown rot and leaf spot. Apply a balanced fertilizer (NPK ratio 10:10:10) during active growth periods. These newer cultivars will give you the biggest flowers and longest stems if they are well fed and watered!