We have found 35 plants that meet your criteria.

Allium Purple Sensation ‘Allium hollandicum Purple Sensation’ Rich, deep purple globes £3.50 Buy
Crocus ‘Crocus vernus Pickwick’ Larger sized, stripey flowers £4.00 Buy
Snake's Head Fritillary ‘Fritillaria meleagris’ Nodding multi-coloured flowers £2.50 Buy
Fritillaria ‘Fritillaria michailovskyi’ A good option for an alpine bed £5.50 Buy
Fritillaria ‘Fritillaria uva-vulpis’ Perfect for an apine bed or rockery £5.00 Buy
Trillium ‘Trillium recurvatum’ Great for naturalising in woodland £3.00 Buy
Double Late Tulip ‘Tulipa Black Hero’ Almost black double flowers £5.00 Buy
Parrot Tulip ‘Tulipa Black Parrot’ Dramatic, blackish-purple, cup-shaped flowers £5.00 Buy
Fringed Tulip ‘Tulipa Blue Heron’ Long-lasting fringed flowers £4.00 Buy
Triumph Tulip ‘Tulipa Blue Ribbon’ Long lasting cut flowers £4.00 Buy
Fringed Tulip ‘Tulipa Curley Sue’ Delicately fringed flower petals £4.00 Buy
Double Late Tulip ‘Tulipa Lilac Perfection’ Flowers grow into generous lilac globes £5.00 Buy
Lily-flowered Tulip ‘Tulipa Maytime’ A tough tulip for bedding displays or pots £3.50 Buy
Triumph Tulip ‘Tulipa Negrita’ A sturdy tulip with rich colour £3.00 Buy
Single Late Tulip ‘Tulipa Queen of Night’ Velvety, dark maroon blooms £3.00 Buy
Triumph Tulip ‘Tulipa Shirley’ Tall white tulip with a mauve edge £4.00 Buy
Triumph Tulip ‘Tulipa Zurel’ Long-lasting cut flowers £6.00 Buy
Allium cristophii ‘Allium cristophii’ Huge globes of star-like, lilac flowers £5.00 Buy
Allium Globemaster ‘Allium Globemaster’ Enormous, deep violet globes £5.00 Buy
Allium Schubertii ‘Allium schubertii’ The flowers look like giant fireworks £7.50 Buy