Flowers have one military mission in life : to make seed . Some bloom are much better at this than others . These are form of bloom to plant in your garden if you trust them to reseed themselves year after year . On the other script , these are varieties of bloom to avoid if you do not desire your flowers to reseed themselves yr after year in your garden .

Johnny Jump-ups

A coolheaded - weather - loving bloom , johnny saltation - ups , also call viola ( Viola cornuta ) are one of the first bedding transplants set out in spring . They appear like tiny milksop and are in fact one of the parents used in the growth of pansies . Johnny jump - ups blush prolifically from other spring until the heat of summer and each spent flower get many seed . When the seeds ripen the seed pod explodes , station its germ in all directions . Thereafter , johnny jumping - ups will get up in the garden bed in which they were embed , as well as every other garden bed on your holding and quite possibly the lawn as well . Violas are fertile reseeders . Grow violas in partial shade to full sun , although they prefer fond shade as the atmospheric condition warms . Keep them well watered , peculiarly when hot weather arrives . When they begin producing fewer blossoms , cut them back by about half of their height and they may bloom again when cool atmospheric condition make it in fall .

Bachelor Buttons

A prairie flower , bachelor button ( Centaurea cyanus ) are also called " cornflowers . " They produce whorls of diminutive flowers that create the look of a orotund flower , with each tiny flower give rise a seed . Bachelor buttons are most often a blue - purple , but can also be pink , white or wine - colored . They grow about 12 inches high and will cover to produce heyday until obliterate by frost . Bachelor button will descend up as volunteers in your garden for many long time after you initially develop them . They can be pulled , left in situ , or easily transplant to a more desired location in your garden .

Cosmos

With delicately dissever , lacy foliage and daisy - like flowers , cosmos ( Cosmos bipinnatus ) are a highly desire yearly flower . Their large sizing — over 4 foot high under ideal uprise term — makes them an ideal improver to the back of the annual flower perimeter . They have a branching riding habit and produce more prime from the crotch between the branches and the main base . Cosmos produces long skinny black seeds that spread themselves all over the flower bed . Volunteer cosmos seedling go forth in mid spring and efflorescence by midsummer . They are easy transplanted to a more desire location and will grow on without missing a pulse after transplanting .

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