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B and T World Seeds' reference number:
The average, annual, minimum temperature zone where Penstemon spectabilis is cold hardy
USDA Zone:7 0° to 10°F (-17.5° to -12.5°C)
|Type of plant - shrub
Flower or inflorescence:
LAVENDER-PURPLE - BLUE, WHITE inside, panicles 15-40cm. long, first year
...(vernalise or stratify)
ovate to 10x5cm., GREY-GREEN
|Height, in meters: 1.2
Height, in feet: 3.96
|Penstemon spectabilis sales history
Common names for Penstemon spectabilis:
|Royal Beard Tongue, Royal Penstemon, Showy Penstemon,|
is included in the following
B and T World Seeds flowering plant categories.
|43||: Herbaceous Border Plant Seed List|
|44||: Cut flowers Commercial and other Recommended Varieties|
|76||: Californian Native Plant Seed List|
|85||: Natives of U.S.South West (Arizona Texas New Mexico)|
|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.|
|698||: First Year Flowering Perennials|
|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 spectabilis seeds will usually germinate in 18-21 days.
Penstemon spectabilis 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".