Once they have 2 or 3 leaves, thin to 8" to 12" inches apart. Remove the lower leaves and push the cuttings into a pot of pre-watered cutting compost. Plant dianthus in full sun for best blooms from nursery transplants, divisions or cuttings. Dianthus can be propagated from seed, division or grown from stem cuttings. If you do take cuttings while the plant is flowering it will reduce the success rate. 2020-06-22 10 Plant Cuttings You Can Root & Grow in Water. To plant your Dianthus from seed, start the germination process indoors at least 2 to 3-weeks before the last frosts falling in your area. 2020-06-22 eHow.com. Most dianthus flowers are easy to grow and can thrive in a range of conditions. How to Grow Perennial Dianthus Flowers . The plants prefer slightly rich, reasonably moist soil that is well-draining and alkaline. For direct sowing outdoors, plant seeds 1/8 inch deep once all danger of frost has passed. The plants prefer slightly rich, reasonably moist soil that is well-draining and alkaline. eHow.com. It is best to propagate from cuttings in early spring, however it can be done throughout the growing season. Propagating Dianthus From Cuttings. Deadheading and some cutting back after the first bloom help to ensure a second bloom later in summer or early in the fall. Cuttings. Cuttings can be taken any time from March to September. Once you take the slips off your Dianthus, remove all the leaves from about 1/2″ to 1″ of the bottom of the cutting, dip the cuttings in a rooting compound like Dip n Grow. PREV 1 of 11 START Filling your home with lush, green plants is an effective way to make it more beautiful and give it a peaceful, relaxing feeling. The poetry of the name fits the pleasant aroma and bright range of possible colors. Dianthus plants are easy to propagate from stem cuttings, and this is an inexpensive way to replace older plants that are coming to the end of their lifespan. But all rooting compounds are good, it makes no difference whether you use a powder, a liquid or a gel. Take several cuttings from healthy fresh stems that have not yet flowered. Choose non-flowering shoots and cut them off just above a node at about 6cm long. How to Grow Dianthus barbatus Plants in your Garden Gardener's HQ Guide to Growing Sweet William. The dianthus plant is commonly called Sweet William. Cover with a plastic bag and leave them on a sunny windowsill. Growing Dianthus from cuttings is also an option. Dianthus barbatus is a biennial member of the Dianthus genus and usually goes by the name of Sweet William. Propagation works best in spring or summer when plant cells are dividing quickly, so rooting happens more easily. Be sure to remove any of the flowers from the cuttings to help increase your chances. Propagating dianthus from either cuttings or divisions is a sure way to create clones of your favorite plants. Full-grown plants reach 12 inches (30 cm) or more in height, depending on variety. However, make sure that the parent plant you’ll use is healthy so that it won’t get stressed after you take cuttings. Check your local listings for the frost dates. You can ensure that the young plants will be right to your parent plant’s characteristics, unlike seeds. They bloom best when given plenty of sun, but they don't like the high heat of mid-summer. Sweet William is easy to grow and maintain, but may need to be replanted after one or two years, since they rarely survive longer. Demonstrating how to use layering, piping and basal cutting techniques, Carol Klein shows us how to propagate dianthus/pinks so they fill can our garden with colour. It can take between four and six weeks for cuttings to root. 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