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Perennial Propagation

Though most perennials may take a couple of years to flower from seed, many are as easily started as annuals. The quickest way to have blooming plants, however, is by vegetative propagation, such as by dividing old plants or rooting stem cuttings. Plants produced vegetatively have all of the traits of the "mother" plant. Propagation by division may seem difficult at first, but most gardeners find that dividing crowns and roots and separating bulbs takes very little experience and can be mastered quickly. Try dividing monkey grass for experience; then move on to daylilies, and before long you will have the hang of it.

Perennial plants with shallow roots are easily pulled apart by hand. Long fibrous roots can be pulled apart with a hand fork. Thickly intertwined roots may need more forceful separation or cutting with digging forks. Replant only those segments with strong roots and a few intact leaves or crowns.

In general, it is best to divide perennials during their dormant or "off" season; divide spring bloomers in the fall and fall bloomers in spring. Some perennials may need dividing every 3 or 4 years, or they will slowly crowd themselves into clumps of nonflowering leaves and roots.

Many perennial plants may be propagated from stem cuttings, which does not disturb the plant's roots. Take stem cuttings during the spring or early summer, choosing stems that are mature and firm but not yet hardened and woody. Cut off 4- to 6-inch segments using a sharp knife or shears, and pinch off the succulent tip and any flower buds to force the cuttings to concentrate their energy on producing roots. Remove the lower leaves that will be below the surface of the rooting medium, but leave a few leaves to provide a source of energy for root initiation and growth.

Because of disease or weather conditions, cuttings often will not root directly in garden soils. They may be easily started in a pot containing a porous, well-drained rooting medium, such as a 1:1 mixture of perlite and peat moss. Coarse sand and vermiculite are also used as rooting soils. These mixtures will hold moisture and yet allow drainage for air circulation. Root-stimulating compounds, including those that contain fungicides, are available at most garden centers. Using a blunt stick, pencil, or finger, open a hole in the rooting medium and insert the treated cutting. Firm the medium around the cutting and water in well.

Many commercial growers use a mist bed to keep cuttings from wilting, but this is usually not feasible on a small scale. You may easily construct a humidity tent from plastic film loosely draped over a frame covering the cuttings. Place the tent in bright light, but prevent overheating by making sure the tent is not located in direct sunshine. Keep the plastic loose to allow air circulation. Avoid direct contact between the leaves and the plastic. The tent will serve as a tiny greenhouse and will maintain a good rooting environment with daily light watering. Rooting often occurs within 3 or 4 weeks. By the time new leaves begin to appear on cuttings, roots are usually formed. Remove the plastic tent and water regularly until plants are firmly established.

Transplant newly rooted plants into prepared beds or pots and place in a bright, protected area until you are ready to set them into your garden or share them with others.

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News

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Filed Under: Flower Gardens February 10, 2020

One of my favorite easy-care, flowering plants has to be lantana. This low-maintenance plant is highly tolerant of the hot, humid summers in our Mississippi gardens.

It’s no wonder that lantana has been selected as a Mississippi Medallion winner three times.

Small purple berries in clumps line branches with green leaves.
Filed Under: Flower Gardens February 3, 2020

Through February, I’m highlighting plants named 2020 Mississippi Medallion winners. Each of these winners is superbly adapted to our garden and landscape environment.

This week, I want to tell you about American beautyberry, a winner that is a native species found across the Southeast. It is known botanically as Callicarpa americana.

Maroon veins stand out on a sea of chartreuse leaves.
Filed Under: Flower Gardens January 27, 2020

A couple of weeks ago, I had the privilege of introducing the 2020 Mississippi Medallion Winners at the Gulf States Hort Expo in Mobile, Alabama. This is a special group of selections, as the Mississippi Medallion program is celebrating its 25th anniversary in 2020.

The plants selected for 2020 include Colorblaze coleus, beautyberry, Luscious Series lantana and Garden Gem tomato.

A person with yellow gloves on planting a shrub.
Filed Under: Lawn and Garden, Flower Gardens, Landscape Management, Vegetable Gardens January 27, 2020

It may be chilly outside, but don’t let that deter you from going outside and working in your garden and landscape. Grab a jacket and your gardening tools, there is plenty to be done during February! 

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Filed Under: Flower Gardens January 17, 2020

I don’t think you can go wrong with some dianthus in your landscape in 2020.

I love the flower colors that include pink, red, lavenders, white, and bicolors. The foliage of these plants ranges from being grass-like to broader strap-like linear leaves. Plus, the foliage provides contrast with colors ranging from bright green to steely blue-gray.

There are some great selections that will do a fantastic job in our Mississippi gardens and landscapes especially in the cooler months of the year.

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