Sensational summer plant combos

Seasonal partners (late summer)
‘Paprika' yarrow (Achillea millefolium ‘Paprika'), 60 x 60 cm, full sun, Zone 3

Violet Queen Italian aster (Aster amellus ‘Veilchenkönigin' [Violet Queen]), 45 x 30 cm, full sun, Zone 5

‘Pink Cloud' heath aster (A. ericoides ‘Pink Cloud'), 75 x 45 cm, full sun, Zone 4

‘Flora's Delight' aster (A. x frikartii ‘Flora's Delight'), 45 x 45 cm, full sun, Zone 6

‘Bluebird' smooth aster (A. laevis ‘Bluebird'), 90 x 45 cm, full sun, Zone 5

‘Kim's Knee High' purple coneflower (Echinacea purpurea ‘Kim's Knee High'), 60 x 30 cm, full sun to part shade, Zone 4

‘Gateway' Joe Pye weed (Eupatorium ssp. maculatum ‘Gateway'), 150 x 60 cm, part shade to full sun, Zone 4

Willow gentian (Gentiana asclepiadea), 45 x 30 cm, part to full shade, Zone 6

‘Frances Williams' hosta (Hosta ‘Frances Williams'), 1 x 1.3 m, part to full shade, Zone 3

‘Morning Light' eulalia grass (Miscanthus sinensis ‘Morning Light'), 1.5 m x 90 cm, full sun to part shade, Zone 6

Variegated purple Moor grass (Molinia caerulea ssp. caerulea ‘Variegata'), 60 x 60 cm, part shade to full sun, Zone 4

Russian sage (Perovskia atriplicifolia) 120 x 90 cm, full sun, Zone 5

Ornamental Chinese rhubarb (Rheum palmatum var. tanguticum), 120 x 90 cm, part shade to full sun, Zone 4

‘Albomarginata' Japanese toadlily (Tricyrtis hirta ‘Albomarginata'), 60 x 45 cm, part to full shade, Zone 5

Where to get them—key
Achillea millefolium ‘Paprika': 1, Alchemilla mollis: 2, Aster amellus ‘Violet Queen': 3, A. ericoides ‘Pink Cloud': 4, A. x frikartii ‘Flora's Delight': 5, A. laevis ‘Bluebird': 6, Clematis x durandii: 7, Coreopsis verticillata ‘Moonbeam': 8, Digitalis purpurea ssp. albiflora: 9, Echinacea purpurea ‘Kim's Knee High': 10, Eupatorium maculatum ‘Gateway': 11, Gentiana asclepiadea: 12, Geranium ‘Ann Folkard': 13, G. pratense ‘Midnight Reiter': 14, G. psilostemon ‘Rozanne': 15, Hosta ‘Frances Williams': 16, Liatris spicata ‘Kobold': 17, Lilium ‘Connecticut King': 18, Linaria purpurea ‘Canon J. Went': 19, Miscanthus sinensis ‘Morning Light': 20, Molinia caerulea ‘Variegata': 21, Perovskia atriplicifolia: 22, Polemonium caeruleum ‘Snow and Sapphires': 23, Rheum palmatum var. tanguticum: 24, Thalictrum delavayi ‘Hewitt's Double': 25, Tricyrtis hirta ‘Albomarginata': 26.

Sources
Brookside Perennials: 1-3, 5, 10, 11, 14, 16, 22, 23.

Centre du Jardin Deux-Montagnes Inc.: 1, 2, 8, 11, 16, 17, 20, 22.

Don & Anna's Greenhouses and Garden Centre: 16, 17.

Down to Earth Gardens: 2.

El Summit Perennials Nursery: 1, 8, 12, 19.

Fraser’s Thimble Farms: 2, 12, 17, 22, 24, 25.

Hole’s Greenhouses & Gardens Ltd.: 1-3, 7-9, 11, 17, 18, 22-25.

Pleasant Valley Nurseries Ltd.: 2, 8, 10.

Richbar Nursery Ltd.: 8, 17, 22.

Richmond Nursery Ltd.: 1-6, 8-11, 13-17, 19-26.

Wild Things Plant Farm: 2, 8, 12, 16, 17, 20, 22.

Read more in Plants and Perennials