Johnny Jump-Up, Heartsease
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.
From Europe and Asia. Perennial grown as a cool-season annual. Spring bloomer to 6–12 in tall and broad; spreads widely by profuse self-sowing. Oval, deeply lobed leaves to 1 1/4 in. long. Pert, 1/2–3/4-in., velvety purple-and-yellow or blue-and-yellow flowers are the original wild pansies. Same planting and care as pansy. Crosses with closely related small-flowered species have produced forms with flowers in violet, blue, white, yellow, lavender, mauve, apricot, orange, red—with or without markings (“faces”).
From Central America. This annual has white, pink, lavender, or purple flower heads on 1–2-ft. s...
Valued for its spicy sweet perfume and cut flowers. Oblong leaves to 4 in. long. Flowers are sing...
Native to southwestern Asia and naturalized in the northern U.S. Dill grows to 3–4 ft. tall, wit...