Plants which flower in May in the UK. The list below may contain both hardy and tender plants. The exact flowering times are subject to local weather and climatic conditions and may vary from year to year.

Acanthus spinosus Bear's Breeches

Acanthus spinosus

Species with deeply-cut spiny leaves and tall spikes of white flowers with purple bracts in early summer. Good cut flower. Drought tolerant. Any soil in sun/ part shade. 1.5 metres (5 feet). AGM

Ajuga reptans 'Black Scallop'

Ajuga reptans 'Black Scallop'

Stunning ground cover plant with very dark, scalloped glossy leaves and dense spikes of dark blue flowers from April-June. Grow in fertile, well drained soil in part/ full shade. 20 cms (7").

Ajuga reptans 'Valfredda' Bugle

Ajuga reptans 'Valfredda'

(Syn. Ajuga 'Chocolate Chip'.) Attractive cultivar with small, narrow purple leaves to 1 inch long and spikes of blue flowers from April-June. Use as ground cover in shade/ part shade in any soil ...... more

Akebia quinnata Chocolate Vine

Akebia quinnata

A pretty climber with delicate leaves and fragrant red-purple flowers in spring sometimes followed by purple fruits. Quick growing and vigouous. Any well drained soil in sun or part shade. Pruning: ...... more

Allium cristophii- Pack of 10 Bulbs Star of Persia

Allium cristophii- Pack of 10 Bulbs

Bulbous plant with very large spherical, silvery-mauve, flower heads to 40cm (16in) across from May - July. Looks best growing up through low-growing plants. Well drained & full sun. Drought ...... more

Allium hollandicum 'Purple Sensation' Pack of 10 Bulbs Ornamental Onion

Allium hollandicum 'Purple Sensation' Pack of 10 Bulbs

Lovely cultivar with spherical, deep purple flower heads to 8cms (3in) across from May-June. Well drained and full sun. Best grown behind or through other plants which hide the leaves which wither ...... more

Anthriscus sylvestris 'Ravenswing'

Anthriscus sylvestris 'Ravenswing'

Perfect for a meadow or wild garden this elegant perennial has dark purple, finely cut leaves and flat heads of white flowers from April-July. It is a cultivated form of Cow Parsley. Well drained ...... more

Aquilegia 'Kristall' Columbine

Aquilegia 'Kristall'

A beautifull perennial with large, pure white flowers with long spurs from May-June. Strong growing. Good for cut flowers and attracting Bees. Grow in moist, well drained soil in sun/ part shade. ...... more

Armeria girardii 'Joystick Red' Thrift

Armeria girardii 'Joystick Red'

Cushions of red-pink flowers to 1 inch across on long stalks from May-August. Grow in well drained soil in full sun. Tolerant of poor soil and salt winds. Ideal for pots, rockery or front of border. ...... more

Bergenia 'Bressingham White'

Bergenia 'Bressingham White'

Valuable for ground cover, this evergreen perennial has large leathery deep green leaves and short stems of delicately, scented tubular white flowers April-May. Grow in humus-rich, moist, well ...... more

Bougainvillea x buttiana 'Raspberry Ice' Paper Flower

Bougainvillea x buttiana 'Raspberry Ice'

Variegated cultivar with bright pink bracts throughout summer. Cut back side shoots to 2-3 buds in spring. Feed and water generously in summer. Pot on every year (loam based compost + grit) ...... more

Brunfelsia pauciflora Yesterday-Today-and-Tomorrow

Brunfelsia pauciflora

Tender shrub with beautifully scented flowers opening mauve fading through lavender to white, appearing spring - autumn. Needs good light but shade from hot midday sun under glass. Hardy in sheltered ...... more

Brunnera macrophylla 'Jack Frost'

Brunnera macrophylla 'Jack Frost'

A must-have perennial for a shady garden where foliage interest is so important. Striking, silvery leaves and forget-me-not-like blue flowers from April-May. Grow in humus-rich, moist, well drained ...... more

Buxus sempervirens Box

Buxus sempervirens

Very slow growing, evergreen shrub commonly used for dwarf hedges. Trim to shape during spring-summer, when needed. For fertile, well drained soil in sun/shade. For hedging, plant 4-6 inches apart. ...... more

Campanula persicifolia 'Chettle Charm' Bellflower

Campanula persicifolia 'Chettle Charm'

Very elegant perennial with large cup-shaped white flowers with the faintest blue tinge on the edge from May-June. For moist, well drained, neutral-alkaline soil in sun/ part shade. Attracts Bees. ...... more

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