How to Grow Delphinium in Florida

Delphinium (Delphinium spp.) grow as perennials in U.S. Department of Agriculture plant hardiness zones 2 through 8, depending on species, but most aren't well suited to the hot summers of USDA zones 8 and above as they prefer cooler, moister summers. Unfortunately for Floridians, Florida's hardiness zones are 8 through 11. While they won't survive Florida's hot summers, delphiniums are ideal as cool-season annuals; their long, flowered stalks give color to the drabber winter landscape. For the most striking effect, plant delphiniums in small or large masses. Planting in mid- to late autumn or very early winter is ideal for spring blooms.

Organic compost
Narrow shovel or gardening trowel
Watering can or garden hose
Plant stakes

Instructions

- 1
  Choose a location in full sun or partial shade. The location also needs protection from strong winds, which may be a little more difficult to come by.
- 2
  Apply 2 to 4 inches of organic compost over the planting area if you're preparing a whole bed. Mix the compost with the soil from the planting hole if you're only planting a few plants.
- 3
  Dig the planting hole as deep as the delphinium's container and twice as wide.
- 4
  Break up the root ball of the delphinium with your fingers and firmly wiggle your fingers to remove as much soil from the roots as possible.
- 5
  Place the root ball in the hole, ensuring that the top of the root ball is flush with the soil, and back-fill the hole with the soil-compost mixture.
- 6
  Water thoroughly after planting.
- 7
  Stake the delphiniums using tall, sturdy plant stakes. Some varieties grow to 6 feet tall; stakes give them support and keep them from drooping or snapping.
- 8
  Remove spent blooms as they fade to promote new flowers throughout their short growing season.

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