• Eventual height: 1m
  • Eventual spread: 0.3m

Lobelia siphilitica f. albiflora

white cardinal flower

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This perennial dies back to below ground level each year in autumn, then fresh new growth appears again in spring.

  • Position: full sun
  • Depth of water: 0-5cm (0-2")
  • Rate of growth: average
  • Flowering period: July to September
  • Hardiness: fully hardy


Presenting an upright and clump-forming nature, this deciduous herbaceous perennial showcases finely toothed, lance-shaped leaves in a crisp light green hue. As summer gracefully shifts to autumn, the white-flowering variant of Lobelia siphilitica steals the spotlight. Delicate spikes of pure white tubular flowers adorn sturdy, upright stems, crafting an illuminating display in consistently moist or boggy garden environments.


  • Garden care:
    Plant out in reliably moist or boggy soil, or pot up into a pond basket and place at the margins of a pond in shallow water no deeper than 5cm (2"). A low maintenance plant, cut back foliage to ground/water level at the end of the year. Divide congested clumps in early spring every few years. Protect the crown of the plant during winter with a thick, dry mulch.
    • Humans/Pets: Harmful if eaten; skin irritant
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