Thursday, March 12, 2015

2015 the Year of the Coleus!

(part 1)
Planning Your Garden 
Carol Ullerich, Master Gardener
Do you dream of coming home to an impressive swath of color like this?

(Photo provided by National Garden Bureau)
Perhaps you’d like to flank the entrance to your home with matching urns of these neon beauties?
(Photo provided by National Garden Bureau)
                                      
If I've struck a chord with you—or perhaps given you a theme for plantings along your driveway or sidewalk, you are in luck!  The National Garden Bureau has declared 2015 the Year of the Coleus!  While blossoms certainly catch the eye in any landscape, it’s foliage that creates the backdrop and allows those showy blooms to shine.  This year, make coleus your “go to” annual for colorful foliage, durability and a wide variety of leaf textures and plant shapes. 
Thought to have originated in Southeast Asia, Dutch botanist, Karl Ludwig Blume, is credited with naming and introducing coleus to England in the mid-19th century.  Its square stems and opposite leaves confirm its place in the mint family and explain why this herbaceous perennial grows so consistently and reliably.
(Photo provided by National Garden Bureau)

Also known as flame nettle or painted nettle, over time coleus has fallen in and out of favor with gardeners.  Its heyday may have come during the Victorian era when coleus was used to create vivid, intricate bedding designs known as “carpet gardening” and even launched a frenzy among gardeners known as “coleus fever.” 
Since the 1980s, new coleus varieties have been introduced annually.  Hybridizers continue bringing new leaf shapes and color combos to market, but they are keenly aware of our desire for more sun tolerant varieties.  No longer reserved for shade-only gardens, in sunny areas, plant any of these coleus series:  Stained Glassworks; Wizard; Versa and Marquee; or any variety with the word “sun” in its name.  Coleus planted in direct sun will probably require more water, so be prepared to supplement with moisture.  As a rule, darker cultivars are more sun tolerant, while lighter-colored varieties appreciate morning sun and dappled afternoon shade.  Too much sun can result in leaf scorching; too little light results in weak stems, reduced vigor and less than desirable color.
                                        
(Photo provided by National Garden Bureau)

Most gardeners consider the dainty flowers produced by coleus to be insignificant and routinely pinch them out to promote bushier plants.  The most common colors found in coleus are green, pink, yellow, orange, red, dark maroon (almost black), brown, cream and white—with many shades of each.  Color patterns feature splashes, blotches, streaks, flecks, margins and veins.
There are three basic forms of coleus—upright, rounded or trailing.  Snip, pinch or trim plants every few weeks to prevent flower formation and promote bushier plants.  Pinch just above a set of leaves or branching junction for the best appearance (avoid leaving a stub).  Consider planting a trailing form as a groundcover or “living mulch” to add interest to beds, shade soil to retain moisture and suppress weeds.
In part shade/part sun areas, try these series:  ColorBlaze, Fairway, Superfine Rainbow, Main Street and Kong.  Coleus generally thrive so long as air temperature remains between 55 and 95 degrees F.  Plant once danger of frost passes, soil temperature is warm, and evening temperatures are above 60 degrees.  Strive for consistently moist soil, avoiding ground that is too wet or too dry.  Fertilize lightly every two weeks.
Part 2 next week.