Garden Problems UK | Pests, Diseases & Fixes
Garden Problems UK
Pests, diseases, and growing problems are part of every UK gardener's life. Find the issue, understand the cause, and fix it fast with our practical problem-solver guides.
Pest Guides
🐌 Slugs & Snails
The UK's most damaging garden pest. Attacks seedlings, lettuce, hostas, and almost everything else overnight.
Slugs & Snails Guide →🐛 Aphids
Greenfly, blackfly, and woolly aphids weaken plants and spread virus diseases. Act early for best results.
Aphids Guide →🦋 Carrot Fly
Invisible larvae tunnel through carrot roots, causing rusty scarring and rot. Prevention is the only reliable fix.
Carrot Fly Guide →🦋 Cabbage White Butterfly
Caterpillars strip brassica leaves to skeletons in days. Netting is the most effective defence.
Cabbage White Guide →Disease Guides
🍅 Blight (Tomatoes & Potatoes)
Late blight is the most destructive disease in the UK vegetable garden. Spreads rapidly in warm, wet weather.
Blight Guide →🪲 Club Root
A soil-borne disease that deforms brassica roots and persists in soil for 20+ years. Raise pH to manage it.
Club Root Guide →☁️ Powdery Mildew
White powdery coating on leaves, common on courgettes, cucumbers, and peas in dry spells.
Powdery Mildew Guide →Growing Problem Guides
🌱 Poor Germination
Seeds not sprouting? Soil temperature, moisture, depth, and seed age are the most common culprits.
Poor Germination Guide →💧 Overwatering Plants
More plants die from overwatering than underwatering. Learn the signs and how to recover affected plants.
Overwatering Guide →🪱 Soil Problems
Compacted, waterlogged, or nutrient-poor soil limits every crop. Diagnose and improve your soil structure.
Soil Problems Guide →Prevention First
Most UK garden problems are easier to prevent than cure. Key habits that reduce problems across the board:
- Rotate crops every year to break pest and disease cycles
- Use fine mesh netting to exclude flying pests
- Water at the base of plants, not the leaves
- Improve drainage and avoid compacting soil
- Remove diseased material promptly — don't compost it
- Choose resistant varieties where available
See our Companion Planting guide for natural pest deterrent strategies.
Plan Smarter, Grow Better
Our UK Vegetable Garden Planner includes crop rotation guides and spacing charts to help you avoid problems before they start.
Get the Planner — £19Frequently Asked Questions
What is the most common pest in UK vegetable gardens?
Slugs and snails are the most widespread and damaging pest in UK vegetable gardens. They are active year-round in mild, wet conditions and can destroy seedlings overnight. Barriers, traps, nematodes, and encouraging natural predators like hedgehogs and ground beetles are the most effective controls.
How do I stop blight on my tomatoes and potatoes?
Blight cannot be cured once established, so prevention is key. Choose blight-resistant varieties, ensure good airflow between plants, avoid overhead watering, and remove and bin (not compost) any affected material immediately. Copper-based fungicides can slow the spread if applied early.
Why are my seeds not germinating?
The most common causes of poor germination are soil that is too cold, too wet, or too dry; seeds sown too deeply; or old seed with low viability. Check the recommended soil temperature for each crop and use a propagator or windowsill for warmth-loving seeds like tomatoes and peppers.
How do I get rid of aphids organically?
Blast aphids off with a strong jet of water, squash colonies by hand, or introduce natural predators like ladybirds and lacewings. Planting nasturtiums nearby acts as a sacrificial trap crop. Insecticidal soap sprays are effective and low-impact if infestations are severe.
What causes white powder on my courgette leaves?
White powdery coating on leaves is powdery mildew, a fungal disease triggered by dry roots combined with humid air. Improve airflow around plants, water consistently at the base, and remove affected leaves promptly. Some courgette varieties have better mildew resistance than others.
