Adored by gardeners for centuries, the
stately spires of Delphinium blooms are breath taking. Delphiniums come in blue, lavender,
pink and white but it is the shades of blue that are the most admired. A real attention
grabber in the perennial border- it takes just three or four colorful spires to attract
the eyes of any passer by. While not the easiest perennial to grow, delphiniums are well
worth the extra effort they require. Plants require a sunny location and a soil that
is as deep and rich as possible. Amend the soil heavily with compost, manure, and peat
moss to a depth of at least 12 inches - even deeper if possible. Work in a good heaping of
bone meal while preparing the soil. Soil needs to stay moist during the growing season but
must also be well drained. Apply a minimum of 3 inches of an organic mulch such as pine
needles or bark around the plants to keep the roots cool and moist. As soon as
plants reach a height of 2 feet stake with bamboo canes. During the summer months keep an
eye on the moisture levels of the soil. When watering is called for make sure to water
deep to encourage the roots to travel down into the cooler layers of the soil.
Delphiniums are heavy feeders and require routine fertilizing. Fertilize with
a top dressing of composted manure in early spring just as new growth emerges followed by
a bi-monthly drink of fish emulsion. After Delphiniums have finished flowering cut
the plants all the way back to the ground to promote a second round of gorgeous
flowers. Once Delphiniums have established themselves in the garden they need to be
divided every three to four years.
:: Printable quick reference guide to growing delphiniums
Delphinium Info:
Zones 3 - 7
Propagation: Seed and Cuttings
Problems: Slugs can destroy young plants in the spring
Cutting: Excellent cut flower
Notes: Delphiniums are very top heavy, especially when in full bloom -
make sure you stake them properly.
