A healthy pachysandra bed should stay dark green and dense year-round, so pachysandra problems - pale or yellowed leaves, bare patches, sticky residue, or dying stems are always a sign something specific is wrong. Most cases fall into one of three buckets: environmental stress (too much sun, poor drainage), a pest infestation, or a fungal disease like Volutella blight. This guide walks through each symptom so you can match what you're seeing to the exact cause and the fix that actually works.
In short:
• Pale or bleached leaves usually mean too much sun or wet, poorly drained soil — not a disease
• Yellowing plus browning stem tips and curling foliage is Volutella blight, a fungal disease that spreads fastest in dense, unpruned beds with poor air circulation
• Small bumps on stems (scale), silk-bound leaves (leaftiers), or stippled yellow/red foliage (spider mites) each need a different pest treatment
• Pachysandra itself is not toxic to dogs, but dense beds can shelter roaches and other pests looking for cover
Pale Leaves Signal an Environmental Problem
Stress from various environmental problems such as too much sun, wet soil, or iron deficiency causes pachysandra leaves to lose their rich green color. Too much sun bleaches pachysandra foliage to a pale, washed-out appearance. Leaves will be light green to yellow, and growth is generally poor. The only solution is to move it into shade, and replace it with a groundcover adapted to sun, such as cotoneaster or creeping euonymus.
If your plants are already growing in shade, check their soil for a drainage problem. Plant roots may be sitting in wet soil, which will eventually kill them. Provide a ditch or other method to drain the water away, or try raising the soil level of the area and replanting.
If the pale, yellowed leaves retain green color along the veins their soil is not acid enough. Plants cannot access the iron in it and develop a condition called iron chlorosis. If a pH meter indicates that the soil needs to be more acid, sprinkle powdered sulfur or used coffee grounds on it or use a product containing iron sulfate or “chelated” iron according to package directions.
Small Bumps on Leaves and Stems Means Scale
The first sign of a scale attack is yellowing of the leaves, followed by leaf drop, reduced growth, and stunting. Heavy infestations kill plants. Some species of scale excrete honeydew, which attracts ants and encourages the growth of sooty molds. If you notice any of these symptoms, look for bumps--rounded waxy shells--which shelter the scale insects as they suck plant sap from stems and leaves. They may be colored white, yellow, or brown to black, and are about 1/10 to 2/5 inch in diameter.
If your pachysandra planting is too extensive to scrape the pests off infested plants with your fingernail, spray the affected foliage with light horticultural oil to smother them in their shells.
For more information see file on Dealing with Scale.
Leaves Bound with Silk Strands Indicates Leaftiers
Leaftiers are the larvae of small moths. They are 3/4-inch-long olive green caterpillars with two prominent black spots near their heads. They protect themselves while feeding by rolling leaves into tubes and binding them with strands of silk. As they feed, the foliage becomes ragged, turns brown and dies.
If there are not too many caterpillars, handpick the larvae in their leafy tubes, crush and discard them. Control larger infestations in late spring by spraying affected foliage with Bacillus thuringiensis (Bt) as soon as you see eggs or the larvae before they take refuge inside their little leaf tubes. The hatching caterpillars will eat the bacterium, stop eating and die in a day or two. Mix the Bt according to package directions just before you're ready to use it. Because Bt is biodegradable and rapidly inactivated by sunlight and rain, spray every 3 to 5 days until the pests disappear.
For more information see file on Dealing with Caterpillars.
Leaves Stippled Yellow or Red Means Spider Mites
Spider mites are tiny spider-like pests about the size of a grain of black pepper. They may be red, black, brown, or yellowish-white. They feed by sucking plant juices, removing chlorophyll and causing small white dots to appear on the foliage. The toxins they simultaneously inject into leaves discolor and distort them. Foliage of mite-infested plants becomes stippled, yellow, and dry, and sometime fine webbing is visible.
Pachysandra under stress from strong sun or drought is vulnerable to mites. To control mite infestations, spray plants with a forceful spray of water every other day for 3 days, to knock the mites from the leaves. If they are still present, spray them with a product containing insecticidal soap as directed on its label.
For more information see file on Dealing with Mites
Yellowed Leaves, Reduced Plant Vigor Means Root Knot Nematodes
Nematodes are whitish, translucent, wormlike creatures barely visible to the naked eye, about 1/50 to 1/10 inch long. Pachysandra plants whose roots are infected by them look sickly, wilted, or stunted. They develop yellowed or bronzed foliage, and then they decline slowly and die. Upon inspection roots are poorly developed, show knots or galls, and may be partially decayed. Nematode activity is most obvious in hot weather, when plants recover poorly from the heat. Northern root knot nematodes attack pachysandra.
Control these pests by adding lots of compost (especially leaf mold) to the soil around the plants to encourage beneficial fungi that attack nematodes. Add liquid fish emulsion to the soil as a drench. It is toxic or repellent to nematodes.
Shriveled Leaves, Dark Spots on Stems? It's Volutella Blight
A fungus (Volutella pachysandrae) that attacks only pachysandra causes brown to black blotches to appear on its leaves, eventually killing them. Similar dark spots (cankers) develop on the stems. Masses of pink spores sometimes appear on the stem cankers. This disease may attack plants that are injured or overcrowded.
Remove and destroy infected leaves and stems as soon as you notice them, cutting the pachysandra back to several inches below the infected area. Improve air circulation by thin overcrowded plants. Disinfect pruning tools in a solution of household bleach and water after using them to avoid spreading this disease. Because the fungus does not live in the soil you can replant with more pachysandra if desired.
For more information see file on Dealing with Fungal Disease
Fungicides can help protect this season's new growth if the disease has hit before, but they only work as prevention - they won't cure leaves and stems that are already infected. Apply in early spring as new foliage emerges, before symptoms show up, and repeat on a two-week schedule per the product label. Chlorothalonil, thiophanate-methyl, and mancozeb are commonly labeled for Volutella blight, but always confirm on the label for your area. If the bed is already showing heavy damage, cutting back and cleaning up is what matters spraying it at that point is wasted effort.
Foliage Browned and Burned By Dog Urine.
Dog urine is mildly toxic to most ornamental plants. It may discolor pachysandra foliage and even kill branches. Spray the vulnerable foliage at corners and edges of beds with an anti-transpirant spray product to provide some protection. Also try screening the plants at the edge of the groundcover patch with low fencing or spraying foliage with an aerosol repellent spray. Prune out damaged areas.
Cockroaches and Other Pests Hiding in Your Pachysandra
If you're seeing roaches in a pachysandra bed, the plant itself isn't the draw — it's the shelter. Dense groundcover planted right up against a foundation stays dark and moist at the soil line, and that's exactly the cover cockroaches, sowbugs, and similar pests look for, whether the bed is pachysandra, ivy, or plain mulch. Beds with a layer of leaf litter or old plant debris underneath are even more attractive, since that decaying material gives pests both moisture and something to feed on.
The fix is the same one that helps with Volutella blight: thin the bed out, clear away leaf litter regularly, and keep at least six inches of open space between the edge of the planting and your foundation so pests have less cover right at the point where they'd enter the house. A dense, overgrown pachysandra bed pushed right up against the siding is the setup that invites them in a well-maintained one, with light and air reaching the soil, is far less hospitable.
Is Pachysandra Poisonous to Dogs?
Pachysandra doesn't appear on the ASPCA's toxic plant list for dogs or cats, and it isn't listed among the toxic species in UC's Safe and Poisonous Garden Plants database either - the two most commonly cited references for pet plant safety. That puts it in a different category from well-known problem plants like lilies, azaleas, or sago palm, which are named specifically because they cause serious reactions. As with any plant material, a dog that eats a large amount of foliage can still get mild stomach upset - vomiting or loose stool simply from the fiber and volume, not from any toxic compound in the leaves.
The pachysandra-and-dog problem homeowners actually run into is the reverse: dog urine burning and browning the foliage, not the plant harming the dog. If your dog is a regular visitor to the bed, expect scattered dead or bleached patches where it relieves itself rather than any sign the plant is affecting your dog's health.
Pachysandra Problems: Frequently Asked Questions
Why is my pachysandra turning yellow?
Pachysandra turns yellow most often from too much direct sun, which bleaches the leaves to a pale yellow-green, or from soil that stays too wet, which suffocates the roots. Check the light first - pachysandra is a shade plant and will yellow within a season if it gets more than dappled sun. If it's in full shade and still yellowing, dig down a few inches after rain; soil that stays soggy for more than a day points to a drainage problem rather than sun. Yellowing paired with brown, curling leaf tips instead of solid pale color usually means Volutella blight rather than an environmental cause.
>Is pachysandra poisonous to dogs?
No, pachysandra is not toxic to dogs. It contains no compounds recognized as poisonous by the ASPCA or university extension services, and it's commonly planted in yards specifically because it's pet-safe. The reverse problem is more common: dog urine burns and browns pachysandra foliage, which is a plant health issue, not a pet safety one. If a dog eats a large amount and shows vomiting or diarrhea, it's still worth a vet call, but the plant itself isn't the cause of concern most owners assume it is.
What is Volutella blight and how do I treat it?
Volutella blight is a fungal disease that causes pachysandra leaves to yellow, then develop brown, curling tips before the stems darken and die. It spreads fastest in dense, overgrown beds with poor air circulation and accumulated leaf litter, especially after a stressful season like drought. Treatment starts with cutting the bed back hard, raking out all fallen leaves, and thinning the planting to improve airflow — fungicide only protects healthy new growth and won't reverse damage already done to infected leaves.
Why is my pachysandra dying?
Dying pachysandra is almost always one of three things: Volutella blight killing off stems in patches, root rot from soil that never drains, or a heavy, untreated scale infestation that's been draining the plant for more than a season. Look at the pattern first — blight kills in spreading patches with brown stem tips, root rot shows uniform decline in the wettest part of the bed, and scale leaves behind visible bumps on the stems before leaves drop. Identifying which of the three is happening determines whether you fix drainage, cut back and remove litter, or treat for pests.
What eats pachysandra?
The main pests that feed on pachysandra are euonymus scale, spider mites, leaftier caterpillars, and root knot nematodes, in roughly that order of frequency. Scale insects show up as small brown or white bumps on stems and undersides of leaves; spider mites cause fine yellow or red stippling; leaftiers bind leaves together with visible silk strands; and nematodes work underground, showing up as yellowed, stunted growth rather than a visible insect. Deer and rabbits largely leave pachysandra alone, which is part of why it's a popular groundcover choice.
Getting Your Pachysandra Bed Back on Track
Most pachysandra problems trace back to one of three root causes: too much sun or poor drainage, an untreated pest, or Volutella blight taking hold in a dense, unpruned bed. Matching the specific symptom to its cause — rather than guessing — is what determines whether the fix is a location change, a pest treatment, or a fall cleanup. Once you've identified the cause, recheck the bed in 2–3 weeks; environmental and pest fixes typically show new, healthy growth within that window, while blight recovery is slower and depends on how much of the planting was cut back.
