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Uneven watering

Plants cope with steady conditions, not with drought followed by a flood. A sudden drink after a dry spell swells fruit and roots faster than their skins can stretch, and interrupted water supply starves fruit of calcium.

Water & drainage
Oversized radishes with deep cracks beside small, whole ones
Oversized radishes with deep cracks beside small, whole ones

What it looks like

The damage appears days after the flood, on whatever was swelling at the time.

  • Tomatoes crack in rings round the stalk or in lines down the side.
    Split fruit Tomatoes crack in rings round the stalk or in lines down the side.
  • Carrots, beets and radishes split lengthways; cabbages burst open at the head.
    Cracked roots Carrots, beets and radishes split lengthways; cabbages burst open at the head.
  • A sunken black patch at the flower end of tomatoes and peppers: blossom end rot.
    Dark fruit tips A sunken black patch at the flower end of tomatoes and peppers: blossom end rot.
  • Radishes turn hot and pithy, cucumbers bitter, when growth stops and starts.
    Woody, bitter crops Radishes turn hot and pithy, cucumbers bitter, when growth stops and starts.

How to confirm it

It is the pattern over time that confirms it.

  1. Think back a week

    Was there a dry spell, then heavy rain or a big watering? Splits follow within days.

  2. Check pot size

    Small containers dry fast, so plants in them swing between extremes daily.

  3. Rule out disease

    Splits from water are clean-edged at first; rot and mould come in later as secondary damage.

What to do

Aim for soil that is moist, never soaked, never dry.

  1. Water on a rhythm

    Water deeply and regularly, every day or two for pots in summer, before plants flag.

  2. Mulch the soil

    A thick mulch evens out the swings between wet and dry.

  3. Harvest ahead of rain

    Pick near-ripe tomatoes and mature roots before a forecast downpour.

  4. Remove damaged fruit

    Pick split or rotting fruit so it does not attract mould and pests.

Prevent it next time

  • Use the largest container you can, or grow bags in pairs.
  • Set up drip lines or self-watering pots for holidays.
  • Sow root crops where you can water them evenly through summer.
  • Grow split-resistant varieties where storms are common.

What not to do

Do not make up for a missed day with a flood. A normal watering, then back to the rhythm, splits less.

In the growing guides

Where the guides mention it, with plant-specific advice.

Sources

  1. Tomatoes: fruit splitting and cracking, Royal Horticultural Society
  2. Blossom end rot, Royal Horticultural Society