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Approximately 600.00 seeds per gram
seed-counts are only a guide, not to be used for accurate calculations.
B and T World Seeds' reference number:
The average, annual, minimum temperature zone where Penstemon angustifolius is cold hardy
USDA Zone:3 -40° to -30°F (-40° to -34.5°C)
|Type of plant - perennial
Flower or inflorescence:
VIOLET-BLUE.June - Aug,
lin.-lance., to 7.5cm.
|Height, in meters: 0.3
Height, in feet: 0.99
|Penstemon angustifolius sales history
Synonyms (alternative names) for Penstemon angustifolius:
|Penstemon caeruleus (Nutt.),|
Common names for Penstemon angustifolius:
|Narrow Beardtongue, Narrow Leaved Beardtongue, Narrow-leaf Penstemon, Pagoda Penstemon, Robin's Egg Penstemon,|
is included in the following
B and T World Seeds flowering plant categories.
|9||: Alpine and Rock Garden Seed List (Hardy and Tender)|
|43||: Herbaceous Border Plant Seed List|
|62||: Mexican Native and Introduced Plants|
|85||: Natives of U.S.South West (Arizona Texas New Mexico)|
|87||: Natives of Central U.S.A.|
|94||: Natives of Rocky Mountain Area U.S.A.|
|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.|
|952||: Wholesale Selection|
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 angustifolius seeds will usually germinate in 18-21 days.
Penstemon angustifolius 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".