B and T World Seeds' reference number:
The average, annual, minimum temperature zone where Delphinium grandiflorum Summer Skies sky blue is cold hardy
USDA Zone:3 -40° to -30°F (-40° to -34.5°C)
|Type of plant - perennial
Flower or inflorescence:
|Height, in meters: 1
Height, in feet: 3.30
|Delphinium grandiflorum Summer Skies sky blue sales history
| Parts of Delphinium grandiflorum Summer Skies sky blue are considered toxic.
Delphinium grandiflorum Summer Skies sky blue
is included in the following
B and T World Seeds flowering plant categories.
|31||: House and Container Plant Seed List|
|43||: Herbaceous Border Plant Seed List|
|44||: Cut flowers Commercial and other Recommended Varieties|
|53||: Bedding Plant Seed List|
|131||: Toxic Plants|
|Some of the deadliest known poisons are found in plants. Some major food plants, eaten by millions of people every day, have toxic parts.|
Some knowledge about growing from seed is necessary to germinate even the easiest seeds.
Most seeds require humidity to germinate, even desert plants like
require that their growing medium remains moist until germination.|
Most seeds require oxygen to germinate, if buried too deep in their growing medium, or if the medium is too wet,
the seeds may not get the oxygen they require.
Delphinium grandiflorum Summer Skies sky blue seeds will usually germinate in 14-21 days.
Delphinium grandiflorum Summer Skies sky blue seeds need to be "overwintered" before they will germinate.
Stratification; cold treatment or vernalization. Seeds of some species need just a couple of weeks, others 3 months. Seeds can be stratified in dampened peat or sand, in a plastic box or bag at 4°C or 5°C in a refrigerator. The seeds should not be frozen or in a wet medium. Very small seeds can be sown on the surface of their growing medium, in pots sealed in plastic bags, and kept in the 'fridge. Many vernalized seeds need light to germinate when they are sown in the "Spring".
Cold stratify 2 weeks High temperatures cause dormancy.