Penstemon cobaea is a clump-forming, Missouri native perennial which occurs on prairies, limestone glades and rocky bluffs. Typically grows 1-2.5' tall. Typically grows 1-2.5' tall. Features loose, terminal panicles of white to violet to deep purple, 2" long, tubular flowers atop erect, rigid, downy stems.
Penstemon Cobaea Care
Penstemon Cobaea
Other names: Prairie Beardtongue
What is the plant
humidity
Normal
lighting
Full Sun
temperature
-3°C - 7°C
hardiness zone
5 - 8
difficulty
Medium
hibernation
Cold Period
How to Care for the Plant
Water
Water freshly planted penstemons for the first summer to help them establish on a dry soil. Water as needed.
Pruning
In autumn cut back the faded foliage by just a third to prevent windrock and then cut the remaining foliage back hard in spring after the last frost.
Fertilizer
In spring apply a general purpose fertiliser to your mixed borders. Water freshly planted penstemons for the first summer to help them establish on a dry soil.
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Sunlight
Full sun, partial shade.
Soil
Perform well in most types of soil.
Temperature
Ideal temperatures should be approximately 65-75ºF + (18-24ºC +), closer to 70ºF is best.
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