Lupinus Westcountry 'Rachel de Thame' is a magnificent lupin with bicoloured pink and white flowers.

Lupinus Westcountry 'Red Rum' is a subtle tricolour with red wings and rose banners with a flush of white.

Lupinus Westcountry 'Tequila Flame' is a magnificent lupin with bicoloured red and yellow flowers.

Iris sibirica 'Cherry Fling' has gorgeous flowers in shades of pink, violet, white and yellow.

Lysimachia 'Beaujolais' has cool silver-blue-green foliage with long-lasting, rippling spikes of wine purple.

Lysimachia congestiflora 'Waikiki Sunset' has yellow-green variegated leaves and cup-shaped yellow flowers all summer long.

Lysimachia lanceolata var. purpurea is an adaptable species with long, linear, purplish leaves and starry, lemon yellow flowers all summer long.

Magnolia ashei, known as dwarf bigleaf magnolia, has large and very fragrant white flowers and huge leaves.

Magnolia macrophylla, the bigleaf magnolia, has huge oblong leaves up to 30 inches long and extra large, fragrant flowers.

Magnolia virginiana 'Northern Belle' is a very hardy sweet bay magnolia with long-lasting, fragrant white flowers.

Magnolia 'Coppertallica' has cupped white flowers held against thick, green, evergreen leaves with copper undersides.

'Elizabeth' is a hybrid Magnolia with beautiful, large, cup-shaped, fragrant yellow flowers on a deciduous, upright, columnar form.

'Elizabeth' is a hybrid Magnolia with beautiful, large, cup-shaped, fragrant yellow flowers on a deciduous, upright, columnar form.

Magnolia 'Tinkerbelle' has fragrant, tulip-shaped flowers in shades of dark magenta and pale pink.

Mahonia nervosa has emerald green, windmill-like leaves and canary yellow spring flowers and waxy blue berries.

Mahonia repens is a very adaptable, native, woodland ground cover with bright, canary-yellow blooms.

Maianthemum dilatatum is a beautiful native ground cover of heart-shaped leaves and spikes of starry white flowers.

Meconopsis paniculata blooms on stems 4-5 feet tall covered in about 50 cupped, silky-textured, lemon yellow flowers.

The Himalayan blue poppy is a horticultural holy grail. Meconopsis 'Lingholm' is one of the best blue poppies for the garden.

Medinilla 'Gregori Hambali' is an intriguing tropical plant from southeast Asia with large pleated leaves with beautiful reddish pink undersides.

Monarda bradburiana 'Midnight Oil' is an uncommon bee balm with pink and cream tubular flowers on green to burgundy leaves.

Monarda Balmy Lilac is a small, compact selection of beebalm with purple-lilac flowers.

Monarda Balmy Pink is a small, compact selection of beebalm with shaggy pink flowers.