Emerald Arborvitae Bronzing in Georgia: Environmental Stress

Nineteen 5–6 year old emerald arborvitae in NE Georgia show orange-bronze foliage from inside out after heavy rains. Planted on a slope with good drainage, they were green until a month ago. Diagnosis Not an infectious

Junipers and Boxwoods Declining in Michigan: Water and Soil Issues

In a Michigan landscape, boxwoods yellow away from the house and junipers brown despite daily irrigation. The site has afternoon sun, mulch, and clay soil—classic overwatering in poorly drained soil. Diagnosis Junipers

Cleveland Pear Decline: Overwatering Suspected

A newly planted Cleveland pear in Alabama shows drooping, blackening leaf edges and leaf drop after daily watering for two weeks. The tree is drought-tolerant once established—overwatering is the likely cause. Correct W

New Boxwoods Turning Whitish-Gray: Transplant Stress?

Three recently planted boxwoods show whitish-gray discoloration on lower leaves. This is not normal and likely indicates transplant stress—root disturbance, soil mismatch, watering issues, or environmental shock. Immedi

Mold on Potting Soil: Causes and Solutions

Mold on soil surface in medical marijuana and herb containers signals excessive moisture—poor drainage, low light, overwatering, or stagnant air. While plants may appear healthy, mold indicates conditions that could lead

Managing Black Knot on Cherry Trees

Black knot (Apiosporina morbosa) is a serious fungal disease on cherry and plum trees, forming rough black galls that girdle and kill branches. On a 7-acre Minnesota property with many infected trees, aggressive manageme

Green Growth on Maple Trunk: Lichens Again

Heavy green growth on a maple trunk and branches is lichens—the same harmless epiphytes described for mulberry. They indicate good air quality and a thin canopy. Lichen Refresher Symbiosis: fungus + algae/cyanobacteria

Brown Spots on Maple Leaves: Phyllosticta Leaf Spot

A 30-year-old maple near Philadelphia shows brown spots with purple-red borders and black fruiting bodies in rings—classic Phyllosticta leaf spot (Phyllosticta minima). It infects late in the season, causing minimal harm

White Rice-Like Spots on Gardenia: Likely Scale Insects

Bringing a gardenia indoors for winter often brings hitchhiking pests. White, rice-grain structures on all leaves strongly suggest scale insects (possibly cottony cushion scale or whitefly nymphs). Immediate Steps Conf

Black Blotches on Mulberry Trunk: Likely Lichens, Not Disease

Large black blotches on a mulberry trunk are almost certainly lichens—a symbiosis of fungi and algae. Theyre epiphytes (grow on bark, not in it) and dont parasitize the tree. Lichen Facts Three forms: crustose (flat),

Frothy Flux on Weeping Willow: Manage, Don't Panic

A weeping willow in Alameda, CA exudes clear, gelatinous froth—likely frothy flux (also called frothy canker). Its a yeast-driven fermentation in the cambium, often entering through wounds. Not a true pathogen, but a sec

Maple Leaf Spots and Tulip Tree Trunk Holes: Two Separate Issues

A homeowner notices white spots on maple leaves and perfectly spaced rows of holes on a tulip tree trunk. These are unrelated problems with different causes. Tulip Tree Holes: Sapsucker Damage The evenly spaced, linear

Diagnosing Apple Tree Fruit and Leaf Problems

A newly inherited apple tree bears small, poor-quality fruit and unhealthy leaves. The previous owner blamed excess rain. While weather plays a role, several common issues could be at play. Possible Causes Apple scab:

Black Growths on Lemon Tree Branches: Scale or Aphids?

Black, semi-circular growths on lemon branches with ants nearby suggest scale insects or aphids. Both excrete honeydew, which attracts ants and can lead to sooty mold (black coating on leaves). Identification Tips Aphi

Managing Borers in a Mature Japanese Maple

A 30-year-old Japanese maple in Victoria, Australia shows bark lifting and a dead limb—classic signs of borer infestation. Once borers tunnel inside, theyre nearly impossible to kill with contact sprays. Systemic Treatm

Reviving a Pot-Bound Yucca with Sticky Leaf Film

A yucca in a huge pot turns out to be severely pot-bound with dry, red-tinged roots—not mushy as expected for rot. Leaves yellow and drop, and a sticky, dusty film coats the foliage. The owner wonders if underwatering is

Troubleshooting Hydroponic Snow Peas in High Heat

Snow peas thriving in an auto-pot hydroponic system suddenly declined during a week of 30°C+ temperatures in Victoria, Australia. Heat stress is a prime suspect, but root issues and pests can mimic heat damage. Heat Imp

Saving a Flowering Plum in Waterlogged Soil

A 12-year-old Krauter Vesuvius flowering plum that blooms poorly and fails to leaf out after pruning likely suffers from chronic waterlogging. The tree sits in a bog-like area where neighbors drainage flows—conditions pl

Diagnosing and Treating a Declining Ligustrum Tree

A mature ligustrum (privet) showing light green, curled, dried leaves on one side—especially the south-facing side—signals stress. While root rot is possible, other factors like fungal infection, nutrient imbalance, or e

Mystery White Beads in Potting Soil: Identifying the Culprit

Finding tiny, hard white beads (0.5–0.75 mm) in your potted plants soil—especially clustered under a downy fuzz—can be puzzling. They resist crushing, turn tan when rubbed, and spread between pots over time without harmi