When a boxwood starts turning brown, dropping leaves, or looking thin and stressed, it is easy to assume the worst. But not every struggling boxwood has the same problem.
Boxwood blight and root rot can both make boxwoods turn brown, thin out, or decline, but they are different problems that require different solutions. Root rot usually starts in wet, poorly drained soil and damages the roots, while boxwood blight starts on leaves and stems and is known for rapid leaf drop and black stem streaks. The more clearly you can read the symptoms, the easier it is to respond appropriately and protect the rest of your landscape.
If you are replacing older boxwoods or planning a new planting, start with a stronger foundation. Better Boxwood varieties are bred for strong resistance to boxwood blight while offering the evergreen structure, dense growth, and classic look gardeners love. Browse the Better Boxwood collection online and use our garden center locator to find a retailer near you.
Key Differences:
Important: Browning boxwoods can also be caused by winter injury, drought stress, salt damage, volutella blight, leafminer, mites, poor planting, or irrigation issues. Before removing a shrub, confirm the diagnosis through your local Extension office or a plant diagnostic lab.
What Is Boxwood Root Rot?
Boxwood root rot is a below-ground problem that affects the roots and sometimes the crown of the plant. Boxwood root rot is often associated with Phytophthora root and crown rot, a soilborne disease favored by wet, poorly drained conditions.
Because the damage begins underground, the first signs can be easy to miss. The plant may simply look stressed. Leaves may lose their rich green color, growth may slow, and individual branches may begin to thin or decline. As the root system becomes more damaged, the plant has a harder time taking up water and nutrients.
This is one reason root rot can be confusing. A boxwood with damaged roots may wilt even when the soil feels moist. In that situation, the plant is not asking for more water. The roots are struggling because they are damaged, oxygen-starved, or unable to function properly.
Signs of Boxwood Root Rot
Boxwood root rot often causes a gradual decline rather than one dramatic symptom. Look for a pattern of stress, especially when the soil stays wet. Common signs include:
- Wilting even when the soil feels moist
- Discolored leaves may remain attached to the plant rather than dropping quickly.
- Dull green, tan, or browning foliage
- Thinning branches
- Weak or reduced new growth
- Dieback on part or all of the plant
- Dark, soft, sparse, or mushy roots
What to Do If You Suspect Root Rot
If root rot seems likely, focus first on improving the growing conditions. Since root rot is closely tied to excess moisture and poor drainage, correcting the water issue is the most important step.
Start by reducing excess irrigation. Check whether sprinklers are hitting the area too often or whether the plant is receiving water from multiple sources, such as rainfall, lawn irrigation, and hand watering.
Next, look at drainage. If water collects around the plant or the soil stays soggy for long periods, the site may need improvement before the boxwood can recover. In some cases, that may mean improving the planting bed, redirecting water, raising the planting area slightly, or choosing a better-drained location for future planting.
Also, check the planting depth. A boxwood planted too deeply can be more vulnerable to crown and root problems. Mulch should help protect the root zone, but it should not be piled against the base of the plant.
What Is Boxwood Blight?
Boxwood blight is a serious fungal disease that affects the above-ground parts of boxwoods, especially leaves and stems. Unlike root rot, which is closely tied to soil and root health, boxwood blight is known for leaf spots, dark stem streaking, and rapid leaf drop. Once a plant is infected, fungicides will not cure it.
Boxwood blight can spread through infected plants, fallen leaves, plant debris, contaminated tools, water splash, shoes, clothing, and equipment. It is especially concerning in dense plantings, hedges, and humid or wet conditions where foliage stays damp for longer periods.
This is why choosing blight-resistant varieties is so important for new plantings and replacement plans. Better Boxwood varieties were bred for strong resistance to boxwood blight, making them a smart choice for homeowners, landscapers, and designers who want classic boxwood beauty with improved disease performance.
Signs of Boxwood Blight
Symptoms of boxwood blight often have a more sudden onset than those of root rot. A shrub may appear mostly healthy, then quickly begin dropping leaves and developing bare sections. Common boxwood blight symptoms include:
- Brown leaf spots
- Rapid leaf drop
- Bare stems
- Dark brown to black streaks on green stems
- Stem lesions or cankers
- Symptoms that appear to spread to nearby boxwoods
The most helpful warning sign is the combination of brown leaf spots, quick defoliation, and black streaking on stems. The black streaks are especially important because they help separate boxwood blight from many other boxwood problems.
Because several boxwood diseases and stress issues can look similar, a suspected case of boxwood blight should be confirmed before making major removal or replanting decisions. Your local Extension office or plant diagnostic lab can help identify the problem more confidently.
What to Do If You Suspect Boxwood Blight
If boxwood blight is suspected, avoid pruning, shearing, or working around the plant when it is wet. Wet foliage can make it easier for disease spores to move from plant to plant. Avoid moving through the affected area and then working around healthy boxwoods without cleaning your tools, gloves, shoes, and equipment first.
Remove fallen leaves and plant debris from around the plant, since infected debris can continue to harbor the disease. Do not compost suspicious or infected material. Bag it and dispose of it according to local guidance. Helpful steps include:
- Avoid handling or pruning wet plants
- Remove fallen leaves and plant debris
- Bag suspicious or confirmed infected leaves, stems, and plant debris before removing them from the site; do not compost infected boxwood material
- Clean tools, gloves, shoes, and equipment after contact
- Monitor nearby boxwoods closely for symptoms
- Contact your local Extension office or plant diagnostic lab for confirmation
In many cases, confirmed infected plants may need to be removed to reduce the risk of spreading boxwood blight through the landscape. After shrub removal, sanitize tools according to local Extension guidance. Common options include disinfecting wipes, rubbing alcohol, or a properly diluted bleach solution. Always clean soil and plant debris from tools before sanitizing.
How to Help Prevent Boxwood Problems
If you love the classic look of boxwood but want a smarter choice for today’s landscapes, Better Boxwood varieties are an excellent place to start. The Better Boxwood collection was bred for strong resistance to boxwood blight while still offering the evergreen structure, dense growth, and polished appearance gardeners expect from boxwood.
That resistance is especially valuable for homeowners, landscapers, and designers who want long-lasting structure without choosing varieties that are more vulnerable to serious disease issues. Better Boxwood varieties are not a cure for an infected planting site, and good sanitation and proper care still matter. But starting with a more resilient plant gives your landscape a stronger foundation.
Better Boxwood varieties can be used for many classic boxwood applications, including foundation plantings, low hedges, formal garden accents, walkway borders, containers, mixed shrub borders, and evergreen structure.
Heritage™ Better Boxwood
Reaching 3–4 feet tall and 2–3 feet wide with dense, deep green foliage and a naturally symmetrical habit, Heritage is ideal for low hedges, borders, foundation plantings, and containers. Bred for strong disease resistance, including strong resistance to boxwood blight, Heritage offers dependable evergreen structure with less maintenance.
Renaissance™ Better Boxwood
Renaissance is a compact boxwood reaching approximately 1–2 feet tall and wide. Its dense habit and year-round color make it ideal for low hedges, borders, parterres, mass plantings, and patio containers.
Babylon Beauty™ Better Boxwood
Reaching approximately 3 feet tall and 4–5 feet wide, Babylon Beauty has a naturally wider-than-tall habit, making it ideal for low hedges, mass plantings, foundation plantings, and patio containers.
Skylight™ Better Boxwood
Skylight is the tallest member of the Better Boxwood collection, reaching approximately 6–8 feet tall and 3–4 feet wide. With a naturally upright habit, fast growth, and mid-green evergreen foliage, it’s ideal for privacy plantings, taller hedges, boundaries, containers, and statement accents.
Ready to find your fit?
Explore Better Boxwood varieties or find a Better Boxwood retailer near you.