For winter protection, add a 4-inch layer of dry mulch after the first hard frost, and remove it in spring once new growth begins. Sweet Williams (Dianthus barbatus), grown as biennials for early summer flowers, are also part of the Dianthus … Hi all, I am just curious as to whether any of you know why my dianthus all died over winter, completely brown and lifeless. Dianthus dying over winter? April 2015 in Problem solving. Posts. How to Grow and Care for the Dianthus Flower in Containers. 0 « 1 2 » Go. Dianthus flowers come in many colors, either it be a solid white, red, purple, pink and sometimes yellow, or with two colors or marks in the petals. The carnation, favoured by florists, is a relative of the pink but does not offer the clove-like scent of a pink. John Hoyland’s recommendations for the best dianthus are also called “pinks.”They belong to a family of plants which includes carnations and are characterized by the spicy fragrance the blooms emit. Arctic Fire: This dianthus features the contrasting eye common in the biennial varieties, but it is hardy to zone 3. The carnation, dianthus likes sunny, wind-protected locations, which enable it to develop nicely. Carnations, dianthus don’t need much or intense care, but there are still some details that need to be kept in mind in order to ensure the best growth possible. Kay x . Dianthus plants may be found as a hardy annual, biennial or perennial and most often used in borders or potted displays. This applies to growth as well as colour intensity and odour development. Thank youuu. Care. Dianthus flowers (Dianthus spp.) Propagation. Firewitch: Although this hot pink variety has been in cultivation since 1957, its popularity exploded when it was named the 2006 Perennial Plant of the Year. Pinks are ideal for cutting and are a reliable and easy-to-care-for addition to the garden. One of them was a pinks too and that also died. I have yet to encounter a dianthus that was not hardy here in zone 3, in an area without reliable snow cover, and without winter protection, despite that some vendors will make claims of "zone 5" or worse. I didn't think these would die from cold weather??? Location. Mulching over them creates a risk of rotting the crowns, and is probably completely unnecessary anyway. Also, help answer other questions about General Gardening and Flower Gardening, and plants at GardeningKnowHow.com Any ideas?? Help answer a question about ice plant, dianthus winter care - Gardening Know How Questions & Answers. Most have an RHS hardiness rating of H6 (hardy to temperatures of -20 to -15ºC), and are suitable for gardens in USDA zones 3a to 9b. Varieties of Perennial Dianthus . Those grown in pots may need some winter protection. Dianthus can be propagated from seeds started indoors, directly sown into the garden, or grown from stem cuttings. 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