B and T World Seeds' reference number:
The average, annual, minimum temperature zone where Penstemon lyallii is cold hardy
USDA Zone:4 -30° to -20°F (-34.5° to -29°C)
|Type of plant - perennial
Flower or inflorescence:
LAVENDER-PINK tubular, clusters
narrow, to 10cm. long -
|Height, in meters: 0.8
Height, in feet: 2.64
|Penstemon lyallii sales history
is included in the following
B and T World Seeds flowering plant categories.
|1||: Stock list|
|Our stock changes almost every day, with seeds arriving and being shipped all over the world.|
We only stock long lived seeds, except for a few species that are always in demand.
Seeds that are not in stock are acquired fresh when ordered.
|9||: Alpine and Rock Garden Seed List (Hardy and Tender)|
|43||: Herbaceous Border Plant Seed List|
|87||: Natives of Central U.S.A.|
|94||: Natives of Rocky Mountain Area U.S.A.|
|97||: Canadian Natives Western and British Colombia|
|185||: Plant Species whose germination is improved by Smoke|
|"Smoke" contains a butenolide compound produced by certain plants when heated, it speeds up or starts the germination of seeds from many different genera.|
|700||: Humming Bird Nectar Plants|
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.
Penstemon lyallii seeds will usually germinate in 18-21 days.
Penstemon lyallii 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".