Ground covers, Perennials
Botanically speaking, violas, pansies, and almost all violets are perennials belonging to the genus Viola. However, violas and pansies are usually treated as annuals, invaluable for winter and spring bloom in mild-winter areas, for spring-through-summer color in colder climates. Typically used for mass color in borders and edgings, as covers for spring-flowering bulbs, and in containers. Violets are more often used as woodland or rock garden plants.
Violas and pansies take sun or partial shade; violets grow in part or full shade (except as noted), but most are natives of deciduous forests and bloom best with at least some sun during the flowering season.
Almost all violets have two kinds of flowers: normal, conspicuous ones that rise above the foliage and may be pollinated and set seed, and short-stemmed, inconspicuous cleistogamous (Greek for “closed spouse”) flowers that set copious seed without pollination and produce offspring identical to the parent. Many violets also spread by aboveground runners. Some reproduce so freely they can crowd out other small plants.
Violas and pansies have such complex ancestries that many botanists are unwilling to assign them to species, preferring to list them by variety name. However, it will avoid confusion if we retain these plants under their former names, invalid though they now may be.
In cold-winter climates, set out nursery plants of pansies and violas in spring for summer bloom; in mild climates, plant in autumn for winter-to-spring (or longer) bloom. Or start from seed: in cold climates, sow in mid- to late summer and overwinter seedlings in cold frame until spring; or sow indoors in winter, plant in spring. In mild-winter areas, sow in mid- to late summer, plant out in fall. To prolong bloom, pick flowers (with some foliage) regularly and remove faded blooms before they set seed. In hot areas, plants get ragged by midsummer and should be removed.Viola hederacea
From Australia. Grows to 1–4 in. high; eventually covers several feet, spreading by runners at a slow to moderate rate. Kidney-shaped leaves to 1/2 in. long. Nearly spurless, 1/4–3/4-in. flowers—broader than high and rather flat—in summer. They come in violet, blue, or white; commonly seen form is white with heavy blue-violet veining in throat. ‘Baby Blue’ has sky blue flowers. Plants go dormant at about 30°F (–1°C). Use as a groundcover in light shade or (with abundant water) in sun.
From Australia. Grows to 1–4 in. high; eventually covers several feet, spreading by runners at a...
Native from southwestern Oregon to Southern California. Growing from fall-planted corms, the flower st...
Hybrids between M. lomariifolia and a Japanese species. Grows to 6–12 ft. high...