Why Tomatoes Split and Crack

A ripe tomato with concentric cracking around the stem

Splitting is almost always a watering story. Here is what is happening and how to stop losing fruit to it.

You walk out to pick a perfect tomato and find it has burst open overnight. Splitting and cracking is one of the most frustrating tomato problems because it tends to hit just as the fruit ripens. The good news is that it is almost entirely preventable once you understand the single cause behind nearly every split.

What causes tomatoes to split

A tomato splits when the inside grows faster than the skin can stretch. The flesh swells with water, the skin reaches its limit, and it tears. Almost every trigger comes back to a sudden change in water supply:

Heavy rain or a big watering after a dry spell. The classic cause. The roots suddenly take up a flood of water, the fruit swells fast, and ripe or nearly-ripe tomatoes split. This is why splits often appear after a summer storm.
Uneven watering. Letting plants dry right out and then soaking them swings the fruit between shrinking and swelling.
A heatwave breaking. Cooler, wetter weather after extreme heat speeds uptake just as fruit ripens.

There are two patterns. Concentric cracks form rings around the stem and are usually from the swelling described above. Radial cracks run down from the stem and tend to show up on fruit exposed to a lot of sun and heat. Some varieties, especially large beefsteak and heirloom types, crack far more readily than small cherry and paste types.

How to stop tomatoes splitting

Water deeply and consistently

This is the whole game. Aim to keep soil moisture steady rather than swinging from dry to drenched. Water deeply two or three times a week rather than a light splash daily, and try to keep the same rhythm so the plant never gets a sudden surplus.

Mulch thickly

A thick straw or lucerne mulch is the best single tool for an Australian summer. It buffers the soil against drying out between waterings and softens the impact of heavy rain, keeping moisture even at the roots.

Pick early when rain is coming

If a storm is forecast and you have fruit that is close to ripe, pick it. Tomatoes ripen beautifully on the bench, and fruit off the vine cannot split from the rain you are about to get.

The quick fix: mulch heavily, water on a steady schedule, and harvest near-ripe fruit ahead of forecast rain. Those three habits stop the vast majority of splits.

Choose crack-resistant varieties

If you garden somewhere with unpredictable summer storms, lean on smaller-fruited and paste types, which crack much less than big beefsteaks. Many modern varieties are bred specifically for crack resistance.

Can you eat a split tomato?

Yes, if you catch it early. A fresh split is just a tear in the skin, so cut around it and use the fruit straight away. The risk is that an open split is an entry point for mould, fruit fly and rot, so do not leave split fruit on the vine. Check daily in splitting weather, pick anything cracked, and use or cook it that day. Discard any fruit that is already weeping, mouldy or sour-smelling.

Catch problems before they cost you a crop

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Frequently Asked Questions

Why do my tomatoes split when they are nearly ripe?

Ripe and nearly-ripe fruit has the least room to stretch, so when a surge of water arrives from rain or a heavy watering, the flesh swells and the taut skin tears. Steady watering and harvesting near-ripe fruit before forecast rain prevents most of it.

Are split tomatoes safe to eat?

A fresh, clean split is fine. Cut away the cracked area and use the fruit the same day. Do not eat fruit where the split has started to weep, grow mould, or smell sour, and never leave split fruit on the vine where pests and rot can get in.

Does too much water cause tomatoes to crack?

It is sudden water rather than too much overall. A flood of water after a dry spell makes the fruit swell faster than the skin can grow. Consistent deep watering and heavy mulch keep moisture even and stop the swing.

Why do only some of my tomatoes split?

Variety and ripeness matter. Large beefsteak and heirloom types crack far more easily than cherry and paste tomatoes, and ripe fruit splits more readily than green fruit. Exposed fruit in full sun also cracks more.

Will splitting affect the rest of the plant?

No, the plant itself is unharmed and will keep producing. The only knock-on risk is that rotting split fruit left on the vine attracts fruit fly and disease, so remove cracked fruit promptly.