When to Stop Feeding Tomatoes (UK Guide)

Feeding tomatoes is essential during summer, but many gardeners continue feeding for too long. Late in the season, continued fertilising actually delays ripening and reduces fruit quality.

This guide explains when to stop feeding tomatoes in the UK and why stopping at the right time helps your harvest finish properly.

For full growing advice, see TOMATOES: HOW TO GROW, BEST VARIETIES, PROBLEMS & EXPERT TIPS (UK GUIDE).

Why You Don’t Feed Tomatoes All Season

Early and mid-season feeding helps plants:

• Flower heavily
• Set fruit
• Grow strong trusses

But late in the season your goal changes.

You no longer want the plant to:

• Grow new leaves
• Produce new flowers
• Get taller

You want it to ripen the fruit already on the plant.

Continued feeding encourages growth instead of ripening.

When to Stop Feeding (UK Timing)

In most UK gardens:

• Greenhouse tomatoes → late August to early September
• Outdoor tomatoes → mid to late August

The exact timing depends on weather and how many trusses have formed.

The Key Sign: Trusses Formed

A good rule:

Once the plant has produced 5–7 fruit trusses (cordon varieties), feeding should gradually stop.

After this point, new flowers will not have time to ripen before autumn temperatures fall.

What Happens If You Keep Feeding?

If feeding continues too late:

• New leaves grow
• New flowers form
• Fruit stays green
• Ripening slows dramatically

Many gardeners unknowingly delay harvest simply by feeding too long.

What To Do Instead

Late season care should shift to ripening:

1. Stop feeding
2. Reduce watering slightly (do not let plants dry out)
3. Remove new flowers
4. Pinch out the growing tip
5. Improve sunlight exposure

This tells the plant to finish the fruit it already has.

Pinching Out the Growing Tip

At the same time you stop feeding:

• Remove the top growing point of the plant

This prevents further vertical growth and directs energy into ripening fruit.

Outdoor Tomatoes

Outdoor tomatoes need feeding stopped earlier because:

• Nights cool sooner
• Sunlight drops faster
• Ripening slows quickly

Stopping feeding in August is often ideal.

Bush (Determinate) Varieties

Bush tomatoes often stop naturally, so:

• Little adjustment needed
• Simply stop feeding once fruits are swelling and season declines

Final Thoughts

Tomato feeding is essential early in the season — but stopping at the right time is just as important. By ending feeding late summer, you encourage the plant to ripen fruit instead of wasting energy on new growth.

Return to TOMATOES: HOW TO GROW, BEST VARIETIES, PROBLEMS & EXPERT TIPS (UK GUIDE) for complete tomato guidance.