Tell us the symptom. We’ll find the cause.
Every guide opens with a quick-diagnosis table: match what you’re seeing, see how likely each cause is, and get the exact fix. No 300-word filler, no forum guesswork.
Aphids on Pepper Plants: Identification and UK ControlAny plant
Aphids on Plants: UK Identification, Control and FixesRose
Aphids on Roses: UK Identification, Treatment and ControlTomato
Aphids on Tomato Plants: UK Identification and ControlBamboo
Bamboo Plant Leaves Turning Yellow: Causes and FixesAny plant
Black Mould or Mildew on Plants: UK Diagnosis and FixesPear
Black Spots on Pear Tree Leaves: UK Diagnosis and FixesTomato
Blossom End Rot on Tomatoes: Causes and UK Fixes
Four ways a plant tells you something’s wrong
Not sure where to begin? Start with the kind of problem you’re seeing — each hub links down to every specific diagnosis beneath it.
Plant leaf problems
Leaves are where plants show distress first. Diagnose yellowing, curling, spots, holes and browning edges — find the cause and the exact fix.
ExplorePests and what they do to plants
Aphids, spider mites, slugs, sawfly, whitefly, vine weevil and more. Identify the pest from the damage it leaves, then treat it the right way.
ExplorePlant diseases
Blight, black spot, powdery mildew, rust, mosaic viruses and rots. Tell fungal, bacterial and viral diseases apart and control them before they spread.
ExploreWatering and nutrient problems
Over-watering, under-watering and nutrient deficiencies cause more plant deaths than pests and disease combined. Learn to read the signs and correct them.
ExploreHow a Leaf & Cause guide works
The same dependable structure on every page — the part that forum threads and thin AI farms never give you.
Match the symptom
A quick-diagnosis table lists every likely cause with a colour-coded likelihood and the single tell-tale sign that separates it from the others.
Confirm, then fix
Each cause has a short “how to confirm it” checklist and a numbered fix — specific actions, not vague advice.
Still stuck? Follow the path
A “still not sure?” decision path sends you to the right answer when two causes look alike.
Most answers to “why is my plant doing this?” are buried in forum threads. We lead with the diagnosis table — the cause, how likely it is, and the exact fix.
— The Leaf & Cause build standard
Browse by what you’re growing
Latest diagnosis guides
Aphids on Pepper Plants: Identification and UK Control
Identify and control aphids on UK pepper plants. Covers peach-potato aphid, whitefly, root aphids, and biological controls — no guesswork.
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Aphids on Plants: UK Identification, Control and Fixes
Spot aphids on your plants? This UK guide covers blackfly, greenfly, woolly aphid and root aphids — how to confirm them and clear them without chemicals.
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Aphids on Roses: UK Identification, Treatment and Control
Aphids on roses in the UK — how to identify rose aphids (greenfly), when to act and how to control them without harming natural predators.
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Aphids on Tomato Plants: UK Identification and Control
Sticky leaves, distorted shoot tips or clusters of insects on your tomatoes? Identify the aphid species and choose the right UK control — from ladybirds to biological controls.
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Bamboo Plant Leaves Turning Yellow: Causes and Fixes
Bamboo plant leaves turning yellow? Diagnose lucky bamboo and outdoor bamboo problems in the UK, from water quality and root rot to light, cold and feeding.
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Black Mould or Mildew on Plants: UK Diagnosis and Fixes
Black sooty mould, powdery mildew or grey mould on your plants? Use this UK diagnosis guide to tell them apart and treat the real cause.
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Black Spots on Pear Tree Leaves: UK Diagnosis and Fixes
Black spots on pear tree leaves are usually pear scab or pear rust. Use this UK diagnosis table to identify the cause and decide what to do.
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Blossom End Rot on Tomatoes: Causes and UK Fixes
Blossom end rot on tomatoes is caused by inconsistent watering, not calcium-poor soil. Diagnose and fix it with this UK guide.
Read the guideCan’t see your symptom? Start with a search.
Type what you’re seeing — yellowing, curling, spots, wilting — and we’ll take you straight to the diagnosis.