English lavender spots on leaves: causes and what to do
8 results in the diagnosis tree begin with spots on the leaves, 5 of them marked likely when the answers fit. They are ordered here for English lavender (Lavandula angustifolia), using what its sources say about light, soil moisture, humidity and pests and diseases and 2 problems recorded for it.
Sources last read 14 September 2026.
Lavandula angustifolia, formerly L. officinalis, is a flowering plant in the family Lamiaceae, native to the Mediterranean basin. Wikipedia, CC BY-SA 4.0
Native range: NE. Spain to Italy (temperate). Also sold as common lavender, English Lavendar, Lavender, Narrow-Leaved Lavender and spike-oil plant.
What English lavender’s sources say that bears on this
- Light
- Full sunRHS · read 13 September 2026
- Soil moisture
- Well-drainedRHS · read 13 September 2026
- Humidity
- ASHRAE recommends indoor relative humidity between 30% and 60%Penn State Extension · read 13 September 2026
- Pests and diseases
- Can be troubled by cuckoo spit (froghoppers) and rosemary beetle. Diseases: a high-risk host of Xylella fastidiosa; grey moulds (Botrytis) and, rarely, honey fungus can occur.RHS · read 13 September 2026
How this shows up on an English lavender
Dry scorched spots after a move into a sunnier spot
On an English lavender the marks are patchy and one-sided. Leaves on the shaded side of the plant keep their colour entirely.
Glass concentrates what would be tolerable outdoors, because it holds the heat and removes the moving air that carried it away. Its source describes full sun.
Telling it apart: Whether it followed a move or a season. Scorch appears within days of a change in position.
RHS · read 13 September 2026Gray, furry patches on damaged or dying leaves
Damaged or dying tissue on the English lavender is covered in gray, fuzzy growth, and the rot spreads into healthy parts.
RHS lists gray mold among the diseases it may get. Crowding and damp air around the plant let spores settle and grow.
Telling it apart: The fur. Gray mold carries a gray, dusty coat; a plain leaf spot does not.
RHS · read 13 September 2026Possible causes, likeliest first for an English lavender
Most likely spider mites
Why: Spider mites feed on individual leaf cells, and each emptied cell shows as a pale speck.
What to try:
- Move the english lavender away from other plants.
- Wash the leaves, top and underside, with a strong spray of water in a shower or sink.
What would settle it: Hold a sheet of white paper under a leaf and tap the leaf. Tiny specks that move across the paper are mites.
Most likely powdery mildew
Why: A white coating that wipes off is the surface growth of a fungus.
What to try:
- Remove the worst-affected leaves.
- Improve air movement around the english lavender and space it away from others.
What would settle it: Wipe a patch. Powdery mildew comes away and leaves a yellowed patch beneath. White that does not wipe off is part of the leaf, or a mineral deposit from hard water.
Most likely thrips
Why: Thrips rasp the leaf surface and drink what leaks out, which leaves silvery, papery streaks.
What to try:
- Move the english lavender away from other plants.
- Wash the leaves thoroughly and remove badly damaged ones.
What would settle it: Tap a leaf over white paper. Thrips are slender, fast-moving and about the size of a comma; they are easy to see once they are on paper.
Less likely for an English lavender, still possible
Questions
- What usually causes spots on the leaves on an English lavender?
- For English lavender: spider mites, powdery mildew and thrips.
- How can I tell which one it is on my English lavender?
- What do the marks look like? Pale, dry, bleached patches on the side facing the window; Brown or black spots, many with a yellow ring around them; Tiny pale speckles all over, sometimes with fine webbing underneath; A white powdery coating that wipes off; Silvery streaks with tiny black dots; Dark, soft, water-soaked patches.
- What do English lavender's sources say about its light?
- RHS: Full sun.
- What does this look like on an English lavender?
- On an English lavender the marks are patchy and one-sided. Leaves on the shaded side of the plant keep their colour entirely. Telling it apart: Whether it followed a move or a season. Scorch appears within days of a change in position.
Other plants that show spots on the leaves
RosemaryDry scorched spots after a move into a sunnier spot
African violetFuzzy gray growth over spreading patches on leaves and stems
Barberton daisyDark spots with a yellow halo spreading across the leaves
Bearded irisFuzzy gray growth over spreading patches on leaves and stems
Bigleaf hydrangeaBrown or black spots on the leaves that grow and merge
Blue passion flowerBleached patches on the side facing the glass
Something else wrong with the English lavender?
What this does not cover
This page orders a decision tree's results using a plant's sourced care. It has not seen your plant, its pot or its window, and two problems at once are common: that is the usual reason a confident answer turns out wrong. The questions in the diagnosis tool narrow it further than a list can.