To get the greatest value from your landscape plants, they should contribute to the beauty of the yard at least three seasons of the year. To increase the yard’s usage beyond daylight hours, you can add a ‘third’ season that extends use into the evening.
Of all of the attribute of plants, it is color that gets and holds our attention. In the early to middle 1900s, English gardener Vita Sackville-West promoted planting what she called ‘grey, white and green plants’. She included in her list whites that open pink or turned a light pink as they matured and plants with variegated foliage.
White or light blooms and light or variegated foliage reflect ambient light in the nighttime garden, extending the beauty and use of the garden without adding more plants.
A full moon on white, silvery or light blooms will shine as though spotlighted. The Cornus kousa (Korean dogwood) is in full bloom backed by dark green foliage. Even with moderate light it needs no spots to show off at night. Dwarf Spirea ‘Limelight’ foliage is light green, but it is enhanced by vivid purple iris, and its deep green foliage is a perfect foil for the spirea.
Sackville’s “White Garden” balanced white with a wide variety of green, from soft mossy grey to pure green. She believed in clumps of foliage to allow the eye to focus on the whites. Among her favorites were candytuft, moon flower, calla, Thalia daffodil, and fragrant snowdrop, all of which are easily obtainable and grow well here. Also, Echinacea purpurea ‘White Swan’, Clematis ‘Duchess of Edinburgh’(Springhill Nursery), Thymus ‘Silver Posie’, To achieve the same effect as her large border plants, add hydrangea and peonies.
A white garden does not add more work or plants, but rewards you with a spectacular evening garden, especially on a moonlit night.