Best for vivid blooms

‘Amethyst in Snow’

Bicoloured, 5cm (2in) diameter blossoms. From www.su ons.co.uk, tel: 0844 326 2200.

‘Gold Bullion’

Golden leaves show off the deep blue flowers. From www.macplants.co.uk, tel: 01875 341179.

‘Joyce’

Variety with fuller, proportioned pink petals. From www.hardysplants.co.uk, tel: 01256 896533.

‘Carnea’

Distinctive, elegant, pale pink flowers. From www.macplants.co.uk, tel: 01875 341179.

‘Jordy’

Plum-purple flowers feature on this recent variety. From www.crocus.co.uk, tel: 01344 578111.

‘Lady Flora Hastings’

Lovely white flowers with pale mauve centres. From www.plantpref.co.uk, tel: 07799 855559.