Plant Base Online (beta)

botanical name:
Polemonium caeruleum
Polemonium caeruleum © Deeproot Plant Base
common name:  Jacob's ladder, Greek valerian
family:  Polemoniaceae
characteristics: perennial
height: 0.90m
width: 0.60m
growth rate: medium
growth habit: clump
leaf colour: green
flower colour: light blue
main season: Summer
aspect: full sun, part shade
conditions: moist soil
preferred soil pH: acid
minimum temp: -15°C
USDA zone: 4 to 9
Clump-forming, large bipinnate leaves of to 27 lance-shaped leaflets. Lax cymes of open bell-shaped, lavender-blue flowers with yellow centres, on erect, branching stems in early summer..

Best in a humus-rich, acid soil and part shade.

From seed or by division of established clumps.

Attractive to bees.

Deeproot tree logo

You can also install Plant Base on your computer:

  • self contained application
  • more features
  • update and add records
  • larger and higher quality pictures
  • fast and efficient
  • always available, no connection needed
  • Windows, Mac and Android

details ...