Space multiple plants 5 to 25 feet apart, depending on the mature size. You will like the texture and year-round color or this holly in group plantings. Go over the topiary in Spring to clip out any Winter damage and, if necessary, tie-in any Winter-splayed branches. T HERE IS ONE punctuation mark I shy away from in writing that I should, however, use more in the garden. You should be 18 to 24 inches higher by the time you get to the other end. If you choose to prune them, do so in winter while the plants are dormant. Most experts recommend 1 male for every 5 female hollies. Sky Pencil Holly Care. If you need some instant definition or strategic screening in your yard, Sky Pencil Holly (Ilex crenata 'Sky Pencil') works beautifully all year long.It's sure to turn heads wherever you plant one. If there is any tip damage by the end of Winter, prune that off in early Spring. However, your boxwoods will also do well if you plant them around March or April. - The shrub has patches of dry leaves that looks like disease or insect. They are about 7-8' tall. Here's how to grow this easy and versatile holly: Narrow and columnar; full to the ground. This improved hybrid holly, 'RutHol 1', was developed by Dr. John M. Ruter, renowned plant breeder and researcher at the University of Georgia. Also train the shrub into a simple topiary; see "Quirks and special cases" below. Holly bushes prefer well-drained soil with a pH range between 5.0 and 6.0. Spring, but holly flowers are small and not showy. If you're planting 'Sky Pencil' as a hedge, planting every two feet is fine. It grows well in any well-drained soil. Pencil Japanese Holly (Ilex crenata 'Fastigiata'): Sometimes we might need a plant with a narrow form that is not a tall tree. The Japanese Holly will grow as tall as ten feet under suitable conditions. Large foliage is always a satisfying counterpart to small. This ornamental plant makes an unusual accent as a container plant or when planted as a small hedge. Sky pencil holly is a slow-growing, columnar shrub that can grow up to 10 feet tall, with a width just a small fraction of that. Unlike, say, boxwood, whose foliage crowds the outer extent of growth, creating a uniform "paving" of foliage and leaving a largely leafless and open-branched interior, Ilex crenata always maintains a deeper texture. At maturity it may put on a bit of weight around the middle, but so far has not exceeded 2 feet in diameter. Be patient. For a plant that grows 20 feet wide, you would space them 16 to 18 feet apart in a single row. Two feet feet across and eight feet tall feet tall. Because a narrow plant is more exciting the taller it gets—and a tall and narrow plant with a ball on top is more exciting still—you'll want to let your 'Sky Pencil' grow for a number of years before starting its training. May 27, 2018 - Explore ota ota's board "Landscape: Sky Pencil Holly" on Pinterest. Plant boxwood in the fall or spring. You could grow 'Sky Pencil' into a simple topiary: A ball atop a column. Even so, you may find that your 'Sky Pencil' hedge is prone to splaying open with heavy snow. Roots shouldn't be allowed to dry so apply water if you're taking a break before transplanting the shrub. Larger shrubs nearby—deciduous or evergreen—are a help, as is any nearby building or fence. Specimens grow slowly in a vertical, pencil-like column Great specimen for tight spaces and containers You may have to replace them every 3 to 4 years to keep them so short. This succulent shrub sprouts pencil-shaped branches and small leaves grow from the tips. Weave back and forth like this until you reach within a foot of the top; finish with a horizontal pass only inches from the top. Space 3 to 4 feet apart. Do not top them. 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