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Symptom Library
What Do Brown Spots on Plant Leaves Mean?
Brown spots can come from very different processes. A useful diagnosis starts with the shape of the spot, whether veins limit it, what the center and margin look like, and whether the same pattern is repeating on other leaves.
What this symptom means
A spot is a location clue. The pattern around it — not the brown color alone — is what separates likely disease lesions from scorch, physical damage, pest injury, or tissue that has died after another stress.
What to notice first
- Round, angular, irregular, or edge-based lesions
- Dark margins, pale centers, halos, or tissue dropping out
- Whether the same pattern repeats across several leaves
- Surface growth, underside signs, or insect feeding near the spots
GardenSolved checkpoint
Do not do this yet
- Do not spray a fungicide from color alone.
- Do not diagnose one isolated old mark as an active disease.
- Do not remove most of the foliage before checking whether new spots are still appearing.
Choose the plant-specific owner
Start with the closest match.
Primary matches own this visible symptom. Related-clue matches mention it as part of a broader diagnostic pattern, so use them only when the page title and plant fit what you are seeing.
Vegetables · Broad Beans
What are the brown spots on my broad bean leaves?
Flat reddish-brown spots that expand during damp weather are consistent with chocolate spot. Small, raised, dusty brown pustules support rust. Check both sides of several leaves and inspect stems and pods. Colour alone cannot confirm either disease.
Open plant-specific answerVegetables · Cucumbers
Downy Mildew on Cucumbers
Use upper-surface lesion geometry, underside evidence, and progression to assess cucumber downy mildew.
Open plant-specific answerPests & Diseases · Pests & Diseases
What causes brown spots on plant leaves?
Identify the plant and compare internal spots with dry leaf margins.
Open plant-specific answerFlowers · Roses
Why do my rose leaves have black spots?
Confirm the black-spot pattern before treating dark lesions on rose leaves.
Open plant-specific answerAlso appears as a related clue
Vegetables · Garlic · related clue
Does my garlic have rust?
Garlic rust can begin as small pale flecks that later become raised orange pustules. Flecks alone are not diagnostic; the developing pustules are a stronger clue. Compare them with flat brown damage, inspect several leaves and record progression. Severe rust can reduce usable leaf area and bulb growth, but a photograph cannot establish every leaf disease or justify a fungicide choice.
Open plant-specific answerPlants · Houseplants · related clue
Why are my houseplant leaves turning brown?
Separate dry, crispy damage from wet-root stress, pests, or leaf spots.
Open plant-specific answerFlowers · Hydrangeas · related clue
Why are my hydrangea leaves turning brown?
Read where the browning starts before treating hydrangea leaves.
Open plant-specific answerPlants · Poinsettia · related clue
Why Are My Poinsettia Leaves Turning Black?
Darkened poinsettia leaves or bracts after cold transport may be cold-injured, but colour alone cannot confirm that. Check whether the dark area is damaged tissue or a surface coating, whether the stem base is firm, and whether the root ball stays wet. Stabilise the conditions while you investigate. Tissue that has died will not become green again.
Open plant-specific answerFlowers · Roses · related clue
Why are my rose leaves falling off?
Read the leaves and root zone before treating rose leaf drop.
Open plant-specific answerFruit · Strawberries · related clue
Why Are My Strawberry Leaves Turning Brown?
Separate weather and water stress from leaf disease, pests, and wilt when strawberry leaves turn brown.
Open plant-specific answerFruit · Strawberries · related clue
Why Are My Strawberry Leaves Turning Red?
Red strawberry leaves need pattern-based diagnosis, especially for scorch, mildew, cold injury, and aging.
Open plant-specific answerVegetables · Tomatoes · related clue
Why are my tomato leaves turning brown?
Read the brown-leaf pattern before choosing a disease or stress response.
Open plant-specific answerNot sure which answer fits?
Continue in the Diagnostic Finder.
Brown spots on leaves will already be selected. Choose what you are growing and the Finder will keep that problem when a matching diagnostic branch exists.