We have found 15 plants that meet your criteria.

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
Allium Globemaster ‘Allium Globemaster’ Enormous, deep violet globes £5.00 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
Foxtail Lily ‘Eremurus stenophyllus’ Towering flower spikes £4.00 Buy
Single Snowdrop ‘Galanthus nivalis ’ A favourite for late winter £2.00 Buy
Double Snowdrop ‘Galanthus nivalis f. pleniflorus Flore Pleno’ A double form of snowdrop £5.00 Buy
Trillium ‘Trillium erectum ’ Red flowers and plain green leaves £3.00 Buy
Trillium ‘Trillium cuneatum’ Big maroon petals £3.00 Buy
Wake Robin ‘Trillium grandiflorum’ An award winning pure white form £3.00 Buy
Trillium ‘Trillium recurvatum’ Great for naturalising in woodland £3.00 Buy
Snowdrop ‘Galanthus nivalis Viridapice’ An unusual snowdrop with a hooded flower £12.00 Buy
Snowdrop ‘Galanthus woronowii’ A shorter variety with chunky foliage £4.00 Buy