Carex oshimensis 'Everillo': A Golden Light in the Garden
Monday, June 30, 2014 at 1:40PM This is my first year with Carex oshimensis 'Everillo', and I have only good things to say about it. It is in in a purple pot beside the stone steps leading down to my woodland garden, where it arches gracefully amidst other woodland plants. 
The foliage is striking, starting out chartreuse and then shading to golden yellow through the summer. This gorgeous ornamental grass does have flowers, but they are insignificant. It will grow in full sun to part shade. Morning sun will bring out the golden lights in the foliage, while the plant will maintain its chartreuse color in shadier spots.
Everillo looks great with other woodland plants such as ferns, hostas and heucheras. Its brilliant gold foliage also contrasts beautifully with many flowering plants. My own Everillo cascades over orange Impatiens. Next year I plan to add the dramatically colored Persian Shield to the summer color scheme. When the summer annuals are gone, evergreen Everillo continues to brighten the landscape and will provide a welcome warm glow in the depth of winter.
Everillo is a type of sedge. Pat Fitzgerald, of Fitzgerald Nurseries, Ltd. in Ireland, discovered this mutation of C. 'Evergold' in 2006. It is easy to grow and is low maintenance. It is not bothered by insects or disease and is deer proof. It will grow in U.S. hardiness zones 5-11. It grows well in containers, and it also may be used as a ground cover or an edging plant.
A well-behaved plant, Everillo has a slow to moderate growth rate, growing in clumps up to about 2 feet wide. It will grow in clay, but it likes well-drained garden soil best. It has average water needs, though it can survive both wet and dry conditions. I water my potted specimen regularly. For those who live near the sea, Everillo is moderately salt tolerant.
If necessary, cut back Everillo by up to half from April to July. Do not cut back in autumn or winter. The clumps can be divided in early spring. Also, neaten clumps in spring by raking or combing out any damaged or dead leaves. Fertilize in spring and mulch around the plant.
Now that I have discovered Everillo, I am exploring other types of sedges and a whole new part of the gardening world... just when I thought my garden was almost complete. I should have known better!