Tight clusters of deep blue flowers form mini-globes on long, strong straight stems of pure silver. The foliage is amazing and quite unique, giving off a silver sheen whatever the weather. Incredibly ornamental in or out of flower. An all round superb species with ideal height.

Sow from late winter to spring in a good seed compost just covering the seed with compost and gently firm down compost and seal inside a polythene bag after sowing. Germination usually takes 10-20 days at 20-25C (70-75F).

When seedlings are large enough to handle, transplant and grow on in cooler conditions. Gradually acclimatise to outdoor conditions for 10-15 days before planting out, after all risk of frost, 60cm (24in) apart in a sunny spot on light well drained soil.