Can delphiniums be successfully grown in Iowa?
The blue or purple flower spikes of delphiniums are a spectacular sight in the garden. Unfortunately, growing delphiniums can be challenging. They don’t like hot, dry weather. In Iowa, delphiniums tend to be short-lived perennials. Plants often die within three to five years. Delphiniums perform best in partial to full sun. The planting site should receive at least 6 hours of direct sun each day. Delphiniums also need a moist, well-drained soil. Crown and root rots can be problems in wet, poorly drained sites. Delphiniums like a consistent supply of moisture throughout the growing season. To help conserve soil moisture, apply a mulch of dry grass clippings, shredded leaves, or other material around plants. During dry weather, thoroughly water plants every 7 to 10 days. When watering, soak the soil to a depth of 10 to 12 inches. How often should I fertilize plants growing in containers? Plants growing in containers require regular fertilization. Levels of essential nutrients in potting
