Your Guide to Holly Trees: Year-Round Beauty and Resilience Tree Varieties Submitted by Matt Giegerich Reviewed by Expert Patrick Parker, Director of Plant Health Care If you're looking for a tree or shrub that brings color, structure, and wildlife to your landscape throughout the year, a holly could be a great choice. Depending on their species, hollies can be evergreen or deciduous. Although their berries aren't safe for humans or pets, they can provide food for some wildlife (primarily birds), and their dense foliage is perfect for privacy and adding beauty to your property. How big do holly trees get? Holly tree varieties come in a wide range of sizes depending on the species. Some are small, compact shrubs that are used for hedges or foundation plantings. Others, like the American holly, can reach 20 to 30 feet in cultivation, though wild forest specimens may grow taller, up to 40 to 50 feet in ideal conditions. Because of their versatility and wide-ranging size, hollies can be a strong addition to large landscapes, small urban gardens, and everything in between. Most common holly tree conditions Hollies are low maintenance, but they have a few specific needs that must be met in order to truly thrive. Knowing these needs ahead of time helps prevent problems and keeps your holly thriving. The first and most important need for hollies is plenty of sunlight. Though these plants tolerate shade to some degree, they produce their most vibrant foliage (and most plentiful berries) when planted in full sun. If you choose a shady spot, your tree may grow, but it will likely be sparse and far less attractive than if planted in full sun. Hollies also need good drainage to avoid root rot, which can increase the likelihood of secondary infections. They struggle with compacted or poorly aerated soil, and they like soil that's slightly acidic, well-drained, and enriched with organic matter. With hollies, watch for scale insects, leaf miners, and spider mites. Scale insects, in particular, can be damaging because they produce honeydew secretions and black, sooty mold, which can seriously damage your tree over time. Healthy plants usually tolerate minor infestations, but severe cases may need professional insect management. Bonus Tip: Ask an ISA Certified Arborist to check your soil pH before planting a holly tree. If your soil is too alkaline, you can add sulfur or other acidifiers to help your plant grow well. What are the best holly tree varieties for your yard? Hollies come in many shapes, sizes, and colors. Some are famous for their berries. Others are well-known for their foliage or small, versatile size. If you're considering adding a holly to your property, start by considering the options below. American Holly (Ilex opaca): A classic evergreen tree with iconic red berries and spiny leaves. Great for large spaces. Japanese Holly (Ilex crenata): A small-leaved, evergreen shrub. Perfect for formal hedges. Winterberry (Ilex verticillata): A deciduous holly known for red winter berries that grow on bare branches. Nellie R. Stevens Holly: A hybrid holly with dense leaves and a pyramid shape. This option is ideal as a privacy screen or specimen tree. Arborist Fact: Hollies are dioecious, meaning each plant is either male or female, and only female plants produce berries. For good fruit set, plant at least one male for every three to five female hollies, and keep the male within about 200 feet so it can pollinate the flowers. Caring for your holly through the seasons Once established, hollies are relatively easy to take care of, but a few simple steps keep them thriving. Young hollies need regular watering, especially in their first few years, while mature plants typically only need deep watering more occasionally. A 2- to 3-inch layer of mulch is also recommended around all hollies. This mulch helps retain soil moisture and regulates temperature. But be careful to keep the mulch away from the trunk in order to prevent root rot. When pruning, focus your efforts during the dormant winter season or in early spring, before new growth begins. Then you can feel free to shape your plant as needed, as hollies respond well to most pruning methods. Consult with your arborist to pinpoint the ideal pruning window for your region, climate, and tree. In the northern regions where the ground freezes in wintertime, evergreen hollies can lose moisture via their leaves faster than their roots can replace it. The result is called winter burn, which shows up as browned or scorched foliage by spring. Antidesiccant treatments coat the leaves with a protective layer that helps them hold onto moisture through the coldest months. Winter is also when deer damage occurs, since other food sources are scarce. Many people think the spiny leaves deter deer, but that isn’t always true. Many hollies (especially hybrid shrub varieties) are prone to deer browsing. If deer are active on your property, winter deer-repellent treatments can help discourage them. Regional considerations Hollies are adaptable, but their tolerance for cold and heat depends on the variety. American and winterberry hollies handle northern climates well, while species like yaupon or Nellie R. Stevens thrive in warmer southern regions. An ISA Certified Arborist can recommend the right variety for your space and soil, plant it properly, and develop a customized maintenance plan to keep it healthy and vibrant. Signs your holly tree may be in decline Even with good care, hollies can sometimes experience stress or decline. Catching the signs early gives you the best chance to correct the problem and save your tree. Here are some red flags to watch for: Yellowing or dropping leaves: While some leaf drop is normal in the early season, widespread yellowing or premature drop may indicate water stress, insect infestations, or nutrient deficiency. Sparse foliage or bare branches: If your holly starts looking thin or patchy, it could be struggling due to poor sunlight, root issues, or insect damage. Cracked or peeling bark: This may signal canker diseases, physical injury, or a more serious underlying condition. Wilting, even when soil is moist: Often a sign of root rot, vascular tree diseases, or significant damage below ground. Sudden leaf drop or dieback: This can signal root disturbance or girdling, which can become a serious issue if left untreated. Excessive insect activity: Sticky residue on leaves, webbing, or visible insects can weaken the tree over time if left untreated. Arborist Tip: If you notice one or more of these symptoms, especially if they progress quickly, consult a professional. An ISA Certified Arborist can identify the underlying issue and recommend a treatment plan. Expert care for your holly tree If you're considering planting a holly tree or want to make sure the holly already on your property reaches its full potential, professional tree and shrub care is invaluable. Contact us today to schedule a consultation with an expert arborist.