We have found 485 plants that meet your criteria.

Yarrow ‘Achillea filipendulina Cloth of Gold’ Flat, plate-like yellow flowers on tall stems £5.99 Buy
New
Yarrow ‘Achillea millefolium Lansdorferglut’ Subtle shades for prairie style planting £6.99 Buy
Price Pruned
Yarrow ‘Achillea millefolium Lilac Beauty’ An unusual lilac, yarrow NOW £5.49 Buy
Yarrow ‘Achillea millefolium Red Velvet’ Deep red, flat heads of flowers and feathery foliage £5.49 Buy
Yarrow ‘Achillea Moonshine’ Lovely, large sulphur-yellow flowers £5.99 Buy
African Lily ‘Agapanthus africanus’ Globes of blue flowers in late summer £5.99 Buy
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
Allium Purple Sensation ‘Allium hollandicum Purple Sensation’ Rich, deep purple globes £3.50 Buy
Allium cristophii ‘Allium cristophii’ Huge globes of star-like, lilac flowers £5.00 Buy
Price Pruned
Allium ‘Allium cristophii’ Huge globes of star-like, lilac flowers NOW £5.99 Buy
Allium Globemaster ‘Allium Globemaster’ Enormous, deep violet globes £5.00 Buy
Allium ‘Allium hollandicum Purple Sensation’ Rich, deep purple globes £5.99 Buy
Allium Schubertii ‘Allium schubertii’ The flowers look like giant fireworks £7.50 Buy
Round-headed Leek ‘Allium Sphaerocephalon’ Small, wine-coloured flowers on tall stems £4.00 Buy
Allium unifolium ‘Allium unifolium’ A longer flowering period that most Alliums £3.75 Buy
Japanese Anemone ‘Anemone x hybrida Honorine Jobert’ Lights up the garden in late summer £5.99 Buy
Wild Angelica ‘Angelica sylvestris Vicar's Mead’ Great for a wildflower garden £6.99 Buy
Cow Parsley ‘Anthriscus sylvestris Ravenswing’ Lacy purple foliage with a sprinkling of white flowers £6.99 Buy
Rock Bells ‘Aquilegia canadensis’ Delicate, nodding flowers. Ideal in a meadow £4.99 Buy