Our pick of the best

‘Blue Cascade’ Mauve flowers smother mounds of foliage. Good for growing over walls. H: 10cm (4in), S: 30cm (12in). From www.thompson-morgan. com, tel: 0844 573 1818. ‘Red Cascade’ From the Cascade Series, flowers hit the red end of the spectrum in bright cerise. H: 10cm (4in), S: 45cm (18in). From www.jparkers.co.uk; tel: 0161 848 1100. ‘Doctor Mules Variegata’ Mauve flowers top green foliage with variegation. H: 10cm (4in), S: 50cm (20in). From www.thompson-morgan. com, tel: 0844 573 1818. ‘Axcent Deep Purple’ Large, neon purple blooms are the highlight. It’s particularly loved by bees. H: 10cm (4in), S: 50cm (20in). From www.thompson-morgan. com, tel: 0844 573 1818. ‘Double Pink’ A pink variety with ruffled double flowers, resembling a tiny geum in form. H: 10cm (4in), S: 40cm (16in). From www.su ons.co.uk; tel: 0844 326 2200. ‘Kitte White’ A new variety of compact form with tufted foliage and single, large white flowers. H: 10cm (4in), S: 40cm (16in). From www.dobbies.com; tel: 0131 561 6406.