Gro 'n Sell
Delphinium Pacific Giants
A standard and reliable series for many years, and still going strong.
Astolat is a dusty rose color seen in few delphiniums. A mix of all colors is also available. Plant in spring in cooler zones for first year flowering. In warmer climates fall plant for spring bloom.
**We do not guarantee any specific shades will appear in Mix products, as the Mix is created by the seed breeder. It is possible that Mix will be all one color, or significantly different from pictured colors. If you need specific shades, please order straight colors as opposed to Mix trays.**
Grown in a 128 cell tray, billed as 125
Order 9 or more weeks in advance of desired ship date.
Learn More: Delphinium Growing Guide
About Tray Sizes
210 and 125 cell trays are full-sized trays, and three of these will fit in a shipping box.
50 cell trays are half-sized trays (unless otherwise noted) and two of these are the equivelent of one full sized tray. Six of these will fit in a shipping box.
18 and 32 cell trays are full sized trays specifically for our vernalized perennials. These have their own set of shipping rules (find details HERE) and cannot be combined with items grown in 210, 125, or 50 cell trays.
Growing Guides
Click here to access all of our comprehensive growing guides.
| Common Name | Delphinium |
| Genus | Delphinium |
| Species |
|
| Family |
Ranunculaceae
|
| Life Cycle |
Perennial, often treated as biennial in warm climates.
|
| Format | Plugs |
| Plug Care |
Transplant within 2 weeks of arrival or bump up into a larger cell until you can transplant.
|
| Netting / Staking |
Varies by location. Delphinium will need staking if grown in high wind and/or heavy rain locations.
|
| Temperature Range |
-35 to 75F
|
| Spacing |
6-12". 18" in cool summer locations.
|
| Soil Preference |
Fertile, moisture retentive soil.
|
| Day Length |
Facultative long day.
|
| Pinching | No |
| When to Plant |
In hot summer locations, plant 2-4 weeks before first frost for bloom the following spring. Can also be planted in a cool greenhouse in winter for spring flower, as you would grow snapdragons. In cool summer locations, plant any time and establish as a true perennial.
|
| Harvesting |
Harvest when 1/3 of florets are open. Cut to the ground to encourage regrowth.
|
| Post Harvest Care |
Use a holding solution. Delphinium is highly sensitive to ethylene and treatment should be considered.
|
| Diseases / Insects |
Powdery mildew should be managed at first sign of infection. Belladonna types seem to be more susceptible to mildew. Broad mites and cylclamen mites can cause puckering of the foliage and distortion of the flowers. Manage with predatory mites.
|
| Bailey's Notes |
The only thing to know is that Delphinium hate heat. If you live in a hot summer location, you need to plant in the fall or late winter and grow them like a hardy annual. In locations with cool summers they become long lived perennials. Cut back to the ground when you harvest and they will often regrow and rebloom. When established as long-lived perennials, thin the new growth to 3-5 shoots per plant to produce better quality flowers.
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| Resources | National Garden Bureau Delphiniums, a perennial favorite |