Spring (Mar-Apr)

Agapanthus africanus, blue flowers (zones 2 and 3) to late summer… not hardy though

Aquilegia, various colours (zones 2, 3, 6)

Aubrieta, silver variegated, purple flowers (zone 3) to June

Brunnera, silver foliage, blue flowers (zone 3)

Camellia Williamsii ‘Jury’s Yellow’, cream flowers (zone 6)

Corylus Contorta, twisted hazel (zone 4) catkins in spring

Cytisus Luna, yellow broom (zone 7) to May

Cytisus ‘Red Favourite’, red broom (zone 6) to May

Dicentra, pink and white (zones 1 and 2) April into summer

Doronicum ‘Little Leo’, yellow flowers (zone 2)

Erodium variabile ‘Flore Pleno’, little pink flowers (zone 1) until September

Euphorbia Amygdaloides Robbiae, green (zone 4) to May

Euphorbia, dark red and light green flowers (zone 3) to May

Helleborus orientalis hybrid ‘Yellow Lady’, yellow-green flowers (zone 3) April-July

Leucojum, white flowers (zone 4)

Lithodora, ‘Heavenly Blue’, bright blue flowers (zones 3 and 8) until early summer

Muscari, blue flowers (zone 3)

Olive tree (zone 4)

Primula elatior, yellow flowers (zones 4 and 9)

Pulmonaria, bright blue flowers (zone 9)

Snake’s Head Fritillary, white and burgundy flowers (zone 4) April to May

Spanish bluebells, blue flowers (zones 1, 3, 8, 9)

Salix integra ‘Hakuro-Nishiki’ (zone 4) shrub can get catkins