🌱 Overview
Spring is the most important feeding season for UK lawns. After winter, grass needs nitrogen to kick‑start growth, strengthen roots, and outcompete moss and weeds. The best spring fertilisers balance fast green‑up, steady growth, and low scorch risk, especially in the UK’s unpredictable March–April weather.
🧪 What Makes a Good Spring Fertiliser
Spring fertilisers usually contain:
- High nitrogen (N) for green growth
- Moderate phosphorus (P) for root development
- Moderate potassium (K) for resilience
Look for an NPK ratio where nitrogen is the highest number (e.g., 12‑3‑4, 10‑2‑2, 15‑0‑5).
Slow‑release nitrogen is ideal in spring because it feeds steadily even when temperatures fluctuate.
⭐ Best Spring Lawn Fertilisers in the UK (Top Picks)
1. Slow‑Release Spring Lawn Feed (Best Overall)
Why it’s good:
- Feeds for 6–8 weeks
- Low scorch risk
- Works well in cool UK spring temperatures
- Ideal for beginners
Best for:
Most UK lawns, especially if you want consistent results without fuss.
2. Fast‑Acting Spring Feed (Best for Quick Green‑Up)
Why it’s good:
- Visible results in 3–5 days
- Great if your lawn looks pale after winter
- Helps boost early growth
Watch out for:
Higher scorch risk if applied during dry spells. Water in if no rain is due.
Best for:
Lawns that need an immediate colour boost.
3. Spring Weed & Feed (Best for Lawns with Weeds)
Why it’s good:
- Feeds the lawn
- Kills common weeds (dandelions, clover, plantain)
- Thickens grass to prevent future weeds
Best for:
Lawns with visible broadleaf weeds.
Avoid if:
You’ve recently seeded or plan to seed within 8 weeks.
4. Spring Moss Control + Feed (Best for Mossy Lawns)
Why it’s good:
- Contains iron sulphate to blacken moss
- Strengthens grass at the same time
- Works well in damp UK climates
Best for:
Lawns in shaded or wet areas where moss thrives.
Note:
Moss will turn black — rake it out after 7–10 days.
5. Organic Spring Lawn Feed (Best for Pet‑Safe & Eco‑Friendly)
Why it’s good:
- Gentle, natural nutrients
- Improves soil health
- Safe for pets and children once watered in
Best for:
Homes with pets, wildlife gardens, or those avoiding synthetic fertilisers.
🧭 How to Choose the Right Spring Fertiliser
Use this quick guide:
- Your lawn looks pale or tired: Fast‑acting feed
- You want steady, safe growth: Slow‑release feed
- You have weeds: Weed & Feed
- You have moss: Moss control + feed
- You prefer natural products: Organic feed
This helps you match the product to your lawn’s condition.
🌦️ When to Apply Spring Fertiliser
The best time is:
- Late March to mid‑April
- When soil is 7–8°C+
- After your first mow
- On a mild day with no frost and light rain forecast
Avoid applying during heavy rain, frost, or drought.
✂️ Mowing and Watering Tips
- Mow 2–3 days before feeding
- Don’t mow again for 5–7 days after feeding
- Water lightly if no rain is due within 24 hours
- Keep pets off the lawn until the feed is watered in
📅 How Often to Feed in Spring
Most spring fertilisers last 6–8 weeks.
A single application in early April is usually enough, but you can apply again in late May if needed.