Go over the topiary in Spring to clip out any Winter damage and, if necessary, tie-in any Winter-splayed branches. Mature size can range from barely a foot in any direction to fifteen feet tall and twenty feet wide. To determine whether the plant you have is a 'Blue Prince' holly or an unfertilized 'Blue Princess,' examine the flowers, located between the leaf and branch joint. Most experts recommend 1 male for every 5 female hollies. If any of these branches that are taller than you'd like the top of the ball to be, tip them. Both bushes appear similarly dense at a glance, but the density of box is comparatively superficial. The roots need to be at least 10" deep according to one source, but we had good results at depths of 12" to 18". Ilex aquifolium, or English holly, generally grows larger (30'-50' at maturity). They produce small, greenish flowers and female plants produce tiny, black berries, but neither is particularly ornamental. With a more trunk-forming species, you'd form this top ball exclusively from growth from the trunk's tip. Hi all, I would like to plant several 'sky pencil' (Ilex crenata) holly at the corners of my house, to add some height. Read on to find out how to plant a Sky Pencil holly and how easy it is to care for this interesting plant. The first thing you’ll notice is its narrow, columnar shape. Japanese holly roots tend to travel about 10 to 12 inches deep into the soil bed. Even so, the berries are a secondary consideration; mature size, hardiness, and habit will always be primary. Growing Zones: 5-9 Up to 8% off. Planting in the Fall Brings Healthier, Better-Developed Roots that Deliver Explosive Growth for Your Landscape Next Spring! When my own shrub reached 6 feet tall, its width was only 12 inches at the widest point. There are forums on how to do that. Japanese holly is one of the most important broadleaved evergreens for gardens in Zones 5, 6, and 7. These Norway Spruce were planted too far apart from each other 25 or 30 years ago and they never formed a privacy screen. Depending on the results, you might have to incorporate limestone into the top 7 inches of soil to raise the pH or add sulfur to lower it. With the exception of a few variegates and gold-leaved cultivars, the foliage is a dignified dark green—much darker than Ilex crenata's counterpart in all of these diversities, boxwood, whose leaves are noticeably lighter green. Pruned stems branch out in response, making the surface of the hedge more and more finely filled-in. Space multiple plants 5 to 25 feet apart, depending on the mature size. You want to be able to appreciate the great structure of these specimen plants. Roots shouldn't be allowed to dry so apply water if you're taking a break before transplanting the shrub. I want to make a hedge of them for privacy in my front yard (see picture below). Plant a sky pencil holly ever 2-3 feet for a nice privacy screen. Do not top them. You could grow 'Sky Pencil' into a simple topiary: A ball atop a column. It would be difficult to have a garden without at least one cultivar of Japanese holly, and even modest gardens might have several. Sky Pencil hollies are narrow, columnar shrubs that grow up to 8 feet (2.4 m.) tall and 2 feet (.6 m.) wide. Come back every week for our latest tips on what to do in your yard. Little Gem Magnolia Tree. That, clearly, isn't sufficient! In warmer Zone 6 and into Zone 7, you can prune in late Fall or in Spring. This form of Japanese Holly only grows to about a metre and a half tall. Q. Root System For Sky Pencil Hollies - How far does the root system extend for sky pencil hollies? Apply 2 to 4 inches (5-10 cm.) For best growth, provide 10'-15' between your hollies. - The shrub has patches of dry leaves that looks like disease or insect. ("Call 811 before you dig!") We include planting instruction along with a care tag to ensure planting your Holly Sky Pencil is everything you … After the topiary is more mature (and therefore a bit hardier), you can also do light pruning in late Fall, after there's no chance of encouraging new growth that would have no time to harden off before Winter. Shop Fall Color! When a holly grows too large, however, you may need to move it. You're pruning the plants into a hedge, remember, so the larger the plants are at planting, the sooner you'll probably have to start your pruning. Do you know the rate of growth for the Pencil… Q. Sky Pencil Hollies - I live in zone 5. In colder Zone 6 and into Zone 5, prune only in early Spring, before growth begins; you'll cut off any Winter kill, as well as give the shrubs the most time to produce new growth and harden it off before the next Winter. As tall and very narrow hedge; like all hollies, 'Sky Pencil' is comfortable with pruning, whether it's regular or occasional, mild or drastic. Holly usually recovers strongly from Winter damage; it doesn't, It would be difficult to have a garden without at least one cultivar of Japanese holly, and even modest gardens might have several. Sky Pencil Holly is a relatively slow-growing, columnar shrub that reaches 4-10 feet in height, with width only about 1/3 of that. It serves well as a low-cropped foundation planting, as a privacy screen, as a hedge or as a specimen tree for a focal point in the garden. In the ground, you can use Sky Pencil holly shrubs as a hedge plant. Unless you're gardening in Zone 7, plant 'Sky Pencil' only in the Spring. USES: Use to accent narrow entrances or in container for formal entrances. They are grown primarily for their interesting shape and make perfect container gardens. 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