Penstemon cardwellii 'Roseus'
|Penstemon cardwellii 'Roseus' ; photo by Todd Boland|
- Description and general information
- This penstemon belongs to the Dasystemon group, most which form evergreen subshrubs. The wild species of P. cardwellii, which has purplish-blue flowers, hails from Washington and Oregon. The cultivar 'Roseus' appears more commonly in cultivation.
- This cultivar forms a mat 10-30 cm (4-12") tall. The foliage is a lovely grey-green to blue-green colour.
- This penstemon, like most, prefers well-drained soil and a sunny site. Like the Dasystemon group in general, this species can tolerate considerable winter-wet so is more suitable in wetter climates than most penstemons. It is known to be hardy in zone 4. If snow cover is not reliable, position them in a sheltered site as cold winds can dessicate the plants. They do not appear to be fussy about soil pH.
- Bloom period
- Late spring to early summer.
- Seed, cuttings
- Surface sow seeds in the fall and leave outside in a cold frame or if sown inside, provide them with 8 weeks stratification.
- Essentially division will result in the plant falling apart into separate 'cuttings' which can be stuck and rooted.
- Cuttings root easily anytime after flowering; they will root within a matter of weeks; keep them lightly shaded during this period.
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Created by Todd Boland.
Last Modification: Saturday 20 of February, 2010 17:18:51 CST by Todd Boland.
The original document is available at http://nargs.org/nargswiki/tiki-index.php?page=Plant+of+the+Month+March+2010