Dianthus Flower Hardiness. Most Dianthus are suitable for planting and growing in USDA zones 3 to 9 but the vast majority of species grow well in the home garden. Low-growing cheddar pinks can be used as a ground cover for a pop of color and added dimension in a landscape.
Plant Sweet William Dianthus barbatus for example which displays flowers in red pink white and bicolor reaches a height of 2 feet and a spread of 1 foot and thrives in USDA hardiness. May 20 2021 Dianthus flowers pinks garden pinks cheddar pinks sweet William clove pinks gillyflower. Annual dianthus has dark green flat leaves.
Annual dianthus has dark green flat leaves.
The final propagation method for dianthus is from division and this is best for the perennial varieties of the plant. Dianthus bloom best with at least six hours of full sun but can tolerate partial shade particularly in the warmest zones. Mat or grass-like tufts need a minimum of 6-10 inches or more spacing. Tall depending on variety.