If you’ve ever stared at a tomato plant dripping with green fruit that just won’t ripen, you’re not alone. There’s one habit serious gardeners use every week — and once you steal it, you’ll wonder how you ever grew tomatoes without it.
Estimated reading time: 6 minutes.
The trick: prune the suckers
Suckers are the small shoots that pop out at the join between the main stem and a branch. Left alone, they turn into leafy mini-trees that hog energy from your fruit. Pinching them off redirects sugar straight into the tomatoes you actually want to eat.
How to find a sucker
- Look at the V where a branch meets the main stem.
- The sucker grows from the inside of that V.
- If it’s smaller than your pinky, pinch it with your fingers.
- If it’s bigger, snip with clean pruners.
Which tomatoes to prune
- Indeterminate (vining types like Big Boy, Cherokee Purple, San Marzano) — yes, prune weekly.
- Determinate (bush types like Roma, Celebrity) — leave alone or prune very lightly.
Why this doubles your harvest
Pruned plants put energy into existing fruit instead of making more leaves. You’ll get larger, sweeter tomatoes, faster ripening, and far fewer fungal problems thanks to better airflow.
Pair the trick with these basics
Deep, even watering
- Water at the base, twice a week, deep enough to soak 6 inches down.
- Mulch with straw to keep moisture steady — this prevents cracking and blossom end rot.
Side-dress when fruit appears
- Sprinkle a handful of compost around each plant.
- Avoid high-nitrogen feed at this stage — it grows leaves, not tomatoes.
Stake or cage early
- Set supports at planting, not after. Late staking damages roots.
- Tie loosely with strips of soft cloth — string can girdle stems.
Practical tips
- Prune in the morning so cuts heal in the day’s warmth.
- Pinch the very top of indeterminates 30 days before your first frost so existing fruit ripens instead of starting new ones.
- Drop suckers in water — they root in a week and become free new plants.
Conclusion
The best gardening secrets are unfair: tiny weekly habits that compound into massive results. Start pruning suckers this week and watch your plants change. New to tomatoes? Pair this with our raised-bed tomato guide.
