We have found 23 plants that meet your criteria.

Hyssop ‘Agastache Black Adder’ Distinctive violet, bottlebrush flowers £5.99 Buy
Price Pruned
Mexican Giant Hyssop ‘Agastache Blue Fortune’ Spires of lilac flowers and aromatic leaves NOW £5.49 Buy
Price Pruned
Allium ‘Allium cristophii’ Huge globes of star-like, lilac flowers NOW £5.99 Buy
Allium ‘Allium hollandicum Purple Sensation’ Rich, deep purple globes £5.99 Buy
Chives ‘Allium schoenoprasum’ Edible leaves and purple, button flowers £3.99 Buy
Valerie Finnis Artemisia ‘Artemisia ludoviciana Valerie Finnis’ Very drought tolerant £5.49 Buy
Wormwood ‘Artemisia Powis Castle’ Silvery, aromatic foliage £5.49 Buy
Bronze Fennel ‘Foeniculum vulgare Giant Bronze’ Tall perennial with feathery, bronze leaves £4.99 Buy
Price Pruned
Balkan Crane's Bill ‘Geranium macrorrhizum’ Bright pink flowers. Perfect for dry shade NOW £5.49 Buy
Rock Cranesbill ‘Geranium macrorrhizum Album’ White flowers. Perfect for suppressing weeds £5.99 Buy
Price Pruned
Bergamot ‘Monarda Beauty of Cobham’ Long flowering and great with grasses NOW £5.49 Buy
Price Pruned
Bergamot ‘Monarda Cambridge Scarlet’ A popular old variety with bright red flowers NOW £5.49 Buy
Bergamot ‘Monarda Croftway Pink’ Delicate pale pink flower whorls £5.99 Buy
Price Pruned
Bergamot ‘Monarda Ou Charm’ Pretty, pink flowers and purple bracts NOW £5.49 Buy
Bergamot ‘Monarda Schneewittchen (syn. Snow Maiden)’ Whorls of wonderful, white flowers £5.99 Buy
Price Pruned
Bergamot ‘Monarda Squaw’ Brilliant red flowers. Mildew-resistant NOW £5.49 Buy
Giant Catmint ‘Nepeta grandiflora Wild Cat’ A giant catmint with deep purple-blue flowers £5.99 Buy
Price Pruned
Catmint ‘Nepeta Six Hills Giant’ A hardy catmint with lavender flowers NOW £4.99 Buy
Catmint ‘Nepeta subsessilis Cool Cat’ Lavender-blue flowers. Great for a herb garden £5.99 Buy
Catmint ‘Nepeta subsessilis Washfield’ Pretty catmint with bright blue flowers £5.99 Buy