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Polemonium caeruleum subsp. villosum 'Blue master'

 
Polemonium caeruleum subsp. villosum 'Blue master'
Common name Jacob's ladder
Family polemoniaceae
Life cycle perennial
Flowers blue
Size to 12"
Light full sun-part shade
Cultural notes ordinary garden soil, not too dry
From seed germinates at room temperature
detailed seed-starting info below
Seed ripensearly July

This strong-growing Jacob's ladder has been much sturdier and more reliable in our garden than the common Jacob's ladder. It has similar delicate compound foliage, and blue flowers. For years I had this mis-identified as P. pulcherrimum, but I was recently set straight by a UK expert. The yellow anthers, and taller growth, put this squarely into the caeruleum camp. Relative to the plain species, subsp. villosum has fewer leaves along the flowering stems.

Jacob's ladder
Polemonium caeruleum subsp. villosum 'Blue master'
Amazingly popping-green foliage in early April

In our garden, this plant grows in the following area: side garden

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Seed-starting details for this plant

  1. Seed from '02 trade. Baggy with light. 70F (68%G, 4-12d)
  2. Same seed as above. Baggy with light. 70F (84%G, 6-9d)
  3. Seed from '05 garden. Baggy 70F with light (58+%G, 4-10d)
  4. Seed from '06 garden. Baggy 70F with light (50%G, 6-11d)
  5. Seed from '06 garden. Baggy 70F (4%G, 19d) - 70F with light (no further G).
    Also seed from '07 garden. Baggy 70F (50%G, 7-12d) - 70F with light (no further G).
  6. Seed from '10 garden. Baggy 70F (55+%G, 3-8d)

Light may not be necessary. Seed has limited viability, apparently approximately 2 years.


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Last modified: April 17, 2011
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