Large Blue Cardinal Flower - Lobelia siphilitica - 3L Pot

Code: PL1132
Large Blue Cardinal Flower - Lobelia siphilitica - 3L Pot
Blue Cardinal Flower - Lobelia siphilitica - 3L Pot

The Blue Cardinal Flower is a clump-forming perennial with upright leafy stems. It bears dense spikes of light to bright blue tubular, two-lipped flowers from summer through until autumn. It enjoys moist conditions so it is a great plant for a bog or waterside location.


  • Foliage Colour: light green in spring, summer and autumn
  • Flower Colour: blue in summer and autumn
  • Approx. Growth Height: 70cm
  • Max. Spread: 40cm
  • Flowering Time: summer and autumn
  • Planting Time: spring
  • Uses: in ponds, bog gardens, wildflower gardens
  • Exposure: sheltered
  • Growing Habit: clump forming, erect
  • Hardiness: hardy
  • Rate of Growth: max height in 2-5 years
Size Options
Supplied AsTitle Price Link
9cm Pot
£17.99 View Here
1L Pot
RRP £13.99
RRP £13.99View Here
3L Pot
£20.99 This Product


  • Light Requirements: partial shade, full sun
  • Moisture: poorly-drained or moist but well drained
  • Soil requirements: acidic, neutral, alkaline, chalky, loamy, sandy, clay


Plant in deep, fertile, permanently moist soil in a full sun or partial shade location. The Blue Cardinal Flower prefers partial shade but in cooler, northern climates it should be in a full sun location.

Caring and Maintenance

This is a very low maintenance, hardy plant. Water adequately during dry and hot periods.

Below is a comparison of pot sizes. From left to right: 9cm Pot, 1L Pot, 3L Pot


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