Prostrate Holly Info – Tips On Caring For Low Growing Holly Plants

Prostrate Holly Info – Tips On Caring For Low Growing Holly Plants

By: Mary Ellen Ellis

Holly is a great evergreen shrub that adds winter green, interesting texture, and beautiful red berries to the garden. But did you know that there is a low growing holly? You can grow prostrate holly to fill in spaces where a normal-sized shrub would be too big.

Prostrate Holly Info

Low growing holly is known as prostrate holly, Ilex rugosa, and tsuru holly. The plant is native to Japan and eastern Russia, and has adapted to growing in harsh winter conditions. In its native ecosystem, prostrate holly grows on mountain slopes. The higher up it is, the lower to the ground its growth will be.

The leaves of prostrate holly are narrower than other types of holly. They are oval and oblong in shape and are bright green in color. They have a very unique texture: wrinkled and yet glossy. As with other hollies, this one produces bright red berries after the small flowers bloom on the female plants. Prostrate holly was first cultivated in the 1890s but it is still rare in the U.S.

How to Grow Ilex Rugosa

Growing prostrate holly is not difficult; the challenge may come in finding one. While not very common outside of its native range, a search online should turn up a nursery that can send you this shrub. Be sure you get at least one male and one female plant.

Prostrate holly is hardy to zone 5, but avoid using it in warm climates. It may not tolerate too much heat or dry weather.

Prostrate holly care is mostly hands-off once established, and even this is easy. Give your holly bush a spot that offers some sun and some shade and well-drained soil. Once in the ground, water the bushes every few days, and throughout the summer if you planted in the spring. Use a balanced fertilizer one a year and water only during droughts.

You can prune your shrubs to give them a nice shape, but a lot of trimming is not necessary. Protection from cold winter weather shouldn’t be needed either, as this is a winter-hardy shrub used to tough conditions.

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Last Updated: March 24, 2020 References Approved

This article was co-authored by Katie Gohmann. Katherine Gohmann is a Professional Gardener in Texas. She has been a home gardener and professional gardener since 2008.

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Holly is a popular and decorative garden plant which ranges in size from 2 to 40 feet (.6 to 12.1 m). Though it's generally a low-maintenance shrub, you will need to prune your plant in order to keep its size under control and to promote the growth of lateral buds and shoots. [1] X Trustworthy Source University of Georgia Cooperative Extension Division of the University of Georgia focused on research and community education Go to source The way you perform this upkeep depends on the particular type of holly you have: while some holly requires only moderate pruning in the first few years of growth, other kinds need a more vigorous pruning regimen. [2] X Research source

American Holly (Ilex opaca)

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American holly is often used as a substitute for English holly (Ilex aquifolium) in Christmas decorations where the latter does not grow well. They are similar in appearance with spiny-toothed leaves and an abundance of red berries. This plant has a number of other common names, including hummock holly, dune holly, and scrub holly. In 1939, American holly was named as the state tree of Delaware.

If you only have room for one American holly tree, look for the 'Croonenburg' variety. It is able to pollinate itself because it has male and female flowers on the same plant. If you prefer yellow fruit, choose the 'Canary' variety. There is also a female version with yellow fruit, labeled I. opaca f. xanthocarpa.

  • Native Area: Southern and eastern United States
  • USDA Zones: 5 to 9
  • Height: 15 feet to 60 feet
  • Sun Exposure: Full sun to part shade

The mere mention of holly brings to mind conical trees with spiny leaves and red berries in winter. That image is valid, but I love evergreen hollies because they are, in fact, so much more diverse than that. They range in size from a 6-inch-tall spreading dwarf to a 70-foot-tall towering giant. Leaves may be small and spineless or large and armed. Berries can be red, orange, yellow, or black. Hollies are one of the few genera that can be grown in all 50 states.

For more on hollies, check out our plant guide.

Wondering how to prune your holly plant? Read more…

Evergreen hollies at a glance

Ilex spp. and cvs.

  • The Ilex genus contains more than 780 evergreen and 30 deciduous species of trees and shrubs native to North and South America, Europe, Asia, Africa, and Australia.
  • Hollies are dioecious male plants produce pollen, and female plants produce berries. A male plant must grow within 30 to 40 feet of a female for good fruit production.
  • There are hollies that will grow as far north as USDA Hardiness Zone 3 and as far south as Zone 11.
  • Most hollies prefer full sun and well-drained, slightly acidic soils. Some species will grow in shade but will produce less fruit.
  • Hollies are relatively pest-free, but some do suffer from winter die-back.
  • Propagate by seed, cuttings, layering, or grafting. Seeds can take several years to germinate. Take cuttings from deciduous species in early summer and evergreen species in late summer. Treat the cuttings with hormones and root under mist.

At the Scott Arboretum at Swarthmore College, where I am the curator, I take full advantage of the versatility of this genus. I use specimen hollies as focal points, as foundation plantings, and as privacy screens and hedges.

Specimens combine good foliage and great berries

Pyramidal trees function well as focal points. Here, a specimen ‘Nellie R. Stevens’ holly serves as a focal point in a mixed border located at a driveway entrance.
Photo/Illustration: Lee Anne White.

A specimen plant is one that is unusual enough to stand alone in a landscape. When placed alone, a specimen holly can be used as a focal point to draw interest to an area. When repeated several times throughout a landscape, specimen hollies can tie a garden together. Unusually attractive hollies can also be grouped to serve as a backdrop for a more intricate planting.

Several evergreen hollies that combine attractive foliage with abundant, colorful fruit make good specimen plants. A few English holly (Ilex aquifolium) cultivars offer great range in plant size, fruit color, foliage shape, and variegation. ‘Rubricaulis Aurea’ offers strikingly variegated forest-green and cream leaves. ‘Peter’s’ has brick-red fruits and suffers the least winter damage of all the English hollies in the Arboretum.

The Altaclere holly (Ilex × altaclerensis) is the quintessential tree holly. It has lustrous dark-green leaves like those of the English holly, but the Altaclere holly suffers much less from winter damage. Its relatively large, bright-red berries contrast nicely with the deep-green foliage. This pyramidal tree reaches from 20 to 30 feet tall at maturity. One excellent cultivar is ‘James G. Esson’.

Dotted through the gardens at the Scott Arboretum are many forms and hybrids of American holly (I. opaca) that are worthy of note. Perhaps, the finest fruiting selection of all the American hollies is ‘Old Heavy Berry’. It becomes heavily laden with brick-red, pea-size berries come winter. The yellow fruit of ‘Boyce Thompson Xanthocarpa’ makes it an excellent specimen holly, whereas ‘John Wister’ is noteworthy for its growth habit. This male cultivar flaunts black-green foliage on the tightly knit branches that make up its pyramidal shape.

The longstalk holly (I. pedunculosa) doesn’t look like a typical holly. The leaves are not spined, but instead have smooth, undulating edges that taper at the end. It is called the longstalk holly because the pedicel (the stem that holds the berry) is much longer than that of other species. The combination of the spineless foliage and the fruit displayed on long stems makes for an elegant plant. Though the growth habit of the longstalk holly is somewhat rangy, with branches that grow in random directions, this habit makes it a good plant to espalier on a wall or fence.

Hollies for specimen plants

Some hollies function well in foundation groupings

Tidy shrubs make good foundation plantings. A successful foundation planting should include a mix of plant types. Here the holly cultivar ‘China Girl’, under the windows, combines well with boxwood, birch, and spirea.
Photo/Illustration: Paul Moore

If you walk around your neighborhood, you’ll surely see the quintessential American interpretation of a foundation planting: a single row of the same species of plant, usually ill suited to the site. I hesitate to categorize hollies as foundation plants for fear that they will be subjected to the same fate. I’m not suggesting that houses don’t benefit from plants placed around the foundation, but a successful foundation grouping should have a complement of shrubs (both deciduous and evergreen), perennials, and some larger plants to anchor the house to the landscape. Some evergreen hollies are perfect choices for the type of foundation grouping I’m suggesting.

The blue holly (I. × meserveae
) combines the glossy leaves and red fruit of the English holly with the hardiness of the Tsura holly (I. rugosa). The resulting hybrid is a relatively hardy shrub with English holly attributes. Blue Angel®, Blue Maid® and Blue Princess® have red fruits, while Golden Girl® has yellow berries. Selectively prune these shrubs to keep them at the desired height for a foundation planting.

Excellent anchor plants for a foundation planting include the Red Holly™ hybrids. These hollies, which feature beautifully glossy, spined leaves, are just coming on the market. They include I. Cardinal™, I. Festive™, I. Little Red™, I. Oak Leaf™, and I. Robin™. Ranging in mature height from 10 to 15 feet tall, they make good corner plants because they don’t overpower the house.

Create privacy with a holly hedge

Tight growers are best used as hedges. The branching structure of I. crenata ‘Green Lustre’ responds well to pruning.
Photo/Illustration: Lee Anne White

Because of their evergreen nature, ease of pruning, and generally quick growth rate, hollies are the perfect plants for screening and hedging in the garden. If you are imagining a large hedge, consider I. × aquipernyi since it reaches between 20 and 25 feet at maturity. This fast-growing tree with spiny foliage quickly grows into an impenetrable mass. The leaves look like small triangles with a sharp spine on each point.

One of the best I.× aquipernyi cultivars for a medium-size hedge is Dragon Lady® because it reaches only 15 feet at maturity. Occasional pruning will keep these hedge hollies tidy without giving them an overly formal appearance.

A more informal treatment can be accomplished using the inkberry holly (I. glabra). It has narrow, glossy, unspined leaves and tiny black fruits. The narrow foliage produces a much finer texture than that of many other hollies. ‘Densa’ will reach 10 feet tall at maturity, while ‘Shamrock’ will stay under 5 feet.

For a shorter hedge, the best choice is the Japanese holly (I. crenata). While this species is by far the most ubiquitous of all the hollies (and arguably overused if not misused as a foundation planting), it does have great application for screening purposes. The leaves are tiny and dark green, it is rapid growing, and it is easily sheared into any shape. A relatively new, very upright selection is ‘Sky Pencil’. Also offering an upright habit but giving more width than ‘Sky Pencil’ is ‘Steeds’. For a more mounding habit, ‘Helleri’, ‘Convexa’, and ‘Green Lustre’ are excellent.

Plant a male and female for best berry set

The Scott Arboretum was designated an official Holly Arboretum by the Holly Society of America. Each year, we evaluate every specimen in our collection for aesthetics, winter damage, and pest and disease problems. After 15 years of evaluation, hollies appear to be relatively trouble free in Philadelphia’s USDA Hardiness Zone 6 climate.

Hollies are dioecious, which means that plants have either male or female flowers. For good pollination and fruit production you need a female (or berry-producing plant) and a male (or pollen-producing plant) within 30 to 40 feet of each other.

Most evergreen hollies thrive best in full sun. The Japanese, American, Koehne, and longstalk hollies will grow in shade, but produce significantly more fruit when grown in sun. Most hollies prefer a well-drained, slightly acidic soil that is high in organic matter. Inkberries will grow in slightly damp soils.

Pruning is necessary only if you want to restrict your holly to a certain shape or size, or if you are growing a hedge. Shaping can be accomplished by removing the tips of the current season’s growth during late summer, fall, or winter. To rejuvenate a holly, “hat rack” it in late winter by cutting back the branches by half to three-quarters of their length. The remaining plant will have few leaves and look like a hat rack, but in spring it will flush out with new foliage from all the pruning cuts. In two to three years, it will be fully covered in leaves. Hat racking will result in a plant much reduced in size, but still full of foliage.

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