There are more than 150 varieties of viburnum , a flowering shrug that include semi - evergreen , evergreen and deciduous cultivars . Many cultivars comport ornamental fruits , but viburnums are good have sex for their spectacular blossoms that can set out from emollient and livid to part or wholly pink . Their power to withstand insensate varies with the mintage , but most can stand U.S. Department of Agriculture hardiness zone 4 through 8 .
Wrong Variety
Experts at the Lady Bird Johnson Wildflower Center at the University of Texas , Austin , say that although many varieties of genus Viburnum are aboriginal to the United States , others come from Asia and South America . Viburnums are known for being dependable bloomers . If your genus Viburnum does n’t flower , it could be because the species you have planted is n’t appropriate for your growing zone . If that ’s the eccentric , it might not ever flower .
Wrong Fertilizer
Too much fertilizer that is N - rich can deter your viburnum from blooming . plant want to blossom so they can regurgitate . If they ’re getting too much atomic number 7 , a florescence flora can get " lazy " and not bother to blossom . If you fertilize , do n’t use lawn fertilizer , which ordinarily contains a large amount of nitrogen .
The first number on the label of a software system of commercial fertilizer , N , support for the portion by weight of N . The second number , P , stands for amount of phosphoric . The third number , K , stands for potassium . Lawn fertilizer will have a tumid proportion of N. You do n’t want that for your viburnum .
Plant Maturity
Some plants need to reach a sure level of maturity for produce prime . If your plant life is too young , it might not be ready to bloom .
Pruning
Those who grow genus Viburnum say one of their charms is that you really do n’t have to prune them . If you do prune , do n’t do it early on in the year so that you wo n’t eliminate bud that will wrench into blossoms . Do n’t dress until after the viburnum blooms . When you snip , eliminate branches that had blossoms . That will encourage the plant to bring on more .
Sun and Soil
Viburnum like lots of Dominicus and are more likely to bloom if they get full sun . They also wish moist , acidulous grease that is well run out .
Bad Timing
Many varieties of viburnum only flush for a duo of weeks . It ’s sluttish to go on holiday and lose the whole show .
