Use these plants

Gunnera manicata

Dramatic architectural plant with flamboyant rhubarb-like leaves held on prickly stems. Needs full sun or part shade and deep, permanently moist soil. H2.5m (8ft) S4m (13ft)

Myrica gale

Deciduous shrub known as bog myrtle. Bears aromatic foliage and clusters of yellow-brown catkins in spring. Needs sun or part shade and poorlydrained soil. H and S1.5m (5ft)

Primula florindae

Perennial producing clusters of scented, sulphur-yellow flowers June-July on tall slender stems. Sun or part shade in reliably moist soil. H1m (3ft 3in) S90cm (3ft)

Iris pseudacorus

Yellow flowers Jul-Aug produced among upright grey-green leaves. Plant in sun or part shade in reliably moist or boggy soil. H1m (3ft 3in)

S2m (6½ft)

Geum rivale ‘Leonard’s Variety’

Perennial with daintylooking bell-shaped coppery-pink flowers Jul-Aug on reddishbrown stems. Sun and moist soil. H45cm (18in) S50cm (20in)

Matteuccia struthiopteris

Deciduous ostrich fern with large, pale green, lacy fronds that unfurl in spring. Likes dappled shade and reliably moist soil. H1.5m (5ft) S45cm (18in)

Rodgersia pinnata ‘Superba’

Large perennial bearing clusters of bright-pink, starry flowers on dark-red stems JulyAug. Leaves mature to purplish-bronze. H1.2m (4ft) S1m (3ft 3in)

Astilbe ‘Brautschleier’

Perennial carrying feathery plumes of white flowers in May above bright green leaves. Prefers sun or part shade and moist humus-rich soil. H70cm (28in) S60cm (2ft)

Camassia leichtlinii ‘Alba’

Spires of starshaped white flowers emerge in May, above strappy leaves. Also comes in pink and blue cultivars. Sun or part shade. H1.2m (4ft) S10cm (4in)