University of Vermont Extension 
Department of Plant and Soil Science

Winter, Spring News Article
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WHAT’S NEW IN COLEUS

Dr. Leonard Perry, Extension Professor
University of Vermont

Many gardeners know coleus--that tender annual grown in gardens for its richly patterned and colored foliage.  Yet many may not realize that in recent years hundreds of cultivars (cultivated varieties) have been introduced, most growing well in the sun of northern climates. In fact, for many of these newer selections the colors get better colors in the sun.  Just keep them well watered when young.  If in a good heavy loam, plants even may survive drought quite well.
   
Coleus were discovered in 1853 in the mountains of Java by plant explorer Karl Blume, and until 2006 were named for him (Coleus blumei).  With all the variations, another scientific name recognized all these hybrids (Coleus x hybridus).  Then botanists decided to change the name to the one now used and unpronounceable by most (Solenostemon scutellarioides). 
   
When I was growing up and first starting to garden, I knew coleus as just a few cultivars, grown from seeds, and planted in the shade.  Many cultivars that you buy at general garden or mass market stores are still grown from seeds and are among the several traditional mixes of colors.  Or, you can buy seeds of these to start yourself. Examples of these series are Carefree (compact, leaves with lobes), Rainbow (bright color combinations), Sabre (elongated leaves), Giant Exhibition (all kinds of colors, a Victorian heirloom), or Wizard (compact, branches well).
   
Specialty and complete garden stores, and some mail order sources, now sell cultivars grown solely from cuttings.  Many of these started to be introduced in the mid 1980’s. Since coleus plants have so many color variations in their foliage, from solids to patterns, spots, and flecks (very tiny spots), and since they tend to make mutations or sports on their own, these sports then can be propagated “vegetatively” by cuttings for a new cultivar. Many of these prefer bright light to full sun for best colors.
   
You even can propagate your own coleus at home if you find such a variation, or just want to enjoy them over winter indoors as did many Victorians in that original era of coleus craziness. If you have space indoors with bright light, you can take cuttings in late summer. Simply cut a branch about four to six inches long, removing the lower two-thirds of the leaves.  Although many people root them just in a glass of water, I prefer a mix of equal parts vermiculite and perlite.  Keep cuttings moist with a plastic bag covering the pot until they begin to root in a couple weeks.
  
If keeping coleus indoors, check regularly for mealybug pests (cottony white masses).  Give plenty of light, or place under artificial gro-lights for 16 hours a day.  If plants get leggy, simply “pinch” the top third or so to get them to branch. Keep soil moist but not too wet.
   
The names alone of some of the new cultivars are fun and often quite descriptive.  Some are quite exotic, such as Religious Radish (dark red, pink margins, pointed tips), Alligator Tears (green with yellow centers), Fright Night (narrow leaves with green, white, purple), or Pistachio Nightmare (green and some purple surrounding pink centers).
  
Other names make your mouth water, such as Chocolate Covered Cherry (bright pink center, dark red and green surrounding), Mint Mocha (highly lobed, green speckled white and purple), Dipt in Wine (dark red, green centers), or Watermelon (scalloped edges, pink and green).  Named after places are Mt. Washington (NH,  chartreuse with dark red margins), Alabama Sunset (dusky red with new yellow growth),  Florida Sunshine (yellow with red flecks), or Sedona (AZ, reddish hues like the landscape there).
   
One of the popular solid colors is the dark purple, almost black leaves of cultivars such as Othello with its ruffled edges and Black Lace with highly cut leaves and bright green contrasts.  Dark Chocolate (available from seeds), Dark Star and Apocalypse are others.  Big Blonde has solid light yellow leaves, as does Wasabi (this one has lobed margins). 
   
Some have a solid color with different colored edge or margin.  Molton Orange is, of course, orange but has a green edge.  Garnet Robe is garnet red with yellow scalloped leaf margins.  Solar Flair is purple with a green margin.  Aurora is light pink with green margins.  Skyrocket and Big Red are red with yellow edges. Lord Voldemort is a striking dark purple with bright green margins. The Flume is highly cut, deep red, with green margins.
   
Then there are those solid colors with different vein colors.  Peter’s Wonder is bright pink with yellow veins and green between veins.  Rustic Orange is mainly dusky orange with some yellow on the margins.   Or the centers may be a different, often lighter, color as in some already mentioned.  Stained Glass is dark red with a lighter center.  Plum Frost is purple with a green center.
   
Some of my favorites have spots or flecks.  Ella Cinders is purple with olive spots, Coal Mine is green with purple flecks, and Freckles is yellow-green with red spots.  Peachy Keen is light orange with yellow flecks. 
   
There are cultivars with edges of leaves that appear cut by scissors in various patterns.  Penney (coppery) has ruffled edges, as does Black Night (purple) and Etna (dark red).  Flirtin Skirts has scalloped edges.  Tilt a Whirl, Killer Klown, and Twist and Twirl have quite unusual rounded and furled leaves in various colors.  A popular one with narrow purple and green leaves, deeply cut, is Kiwi Fern.
   
Some coleus have very small leaves, often low or even trailing, as in Inky Fingers (did you guess green with dark markings?).  Trailing Queen has bright pink centers, while Trailing Lava Rose has bright red centers, both then surrounded by dark red and then green margins.  Trailing Plum Brocade has dark red centers surrounded by brighter pink.
   
Large-leafed cultivars include Atlas (dark red, green centers) and the Kong series.  The latter came out a few years ago, and now includes a half dozen or so cultivars such as Lime Sprite, Salmon Pink, or Mosaic.  Unlike many of the newer coleus, the Kong series prefers part to full shade.
  
Another new series is called Under the Sea, and has such cultivars as Lion Fish (dark purple with some pink, highly cut leaves), Bone Fish (dark pink, cut leaves with yellow margins), and Electric Coral (highly cut leaves, dark red with green margins).
   
These are only a few examples to give you an idea of the many variations available.  The International Coleus Society (linked from www.cultivar.org) is a great resource if you want to learn more, and see samples of their 15 groups based on leaf shapes (such as sabre, linear, twirled, egg-shaped, rounded and so forth).
   
Then there are online catalogs, such as the coleus specialist Rosy Dawn Gardens (www.rosydawngardens.com) or Glasshouse Works (www.glasshouseworks.com).  Coleus:  Rainbow Foliage for Containers and Gardens, by New Jersey grower Ray Rogers and published by Timber Press is a great resource too.  The National Garden Bureau (ngb.org) has a fact sheet on coleus, as they named it a plant of the year for 2015.
   
Plan for some new coleus in this year’s garden, and in combination with flowers of similar colors, or in contrast to solid colored leaves.  Just keep in mind that colors may vary, even change in your garden, depending on the light intensity, fertility, and age of the plant.


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