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Flowers without fruit: check boron, also check drought and salt

Empty flowers are not always a boron bottle.

Nutrient shortage
Speed
  1. Drought also drops flowers; boron shortage often splits stems and stops the growing point.
  2. Salt injury scorches margins with white crust; boron shortage is flowers that set nothing.
  3. Don’t double boron; don’t broadcast borax as base without a test.
  4. Foliar boron: Labelled lower rate, twice. A small patch first
  5. Name what you see before you feed.
  6. If leaves, roots and the surface disagree, stop.
  7. Boron runs flowering.
  8. Deficiency and toxicity are thin.

What you see in the field

Bloom without fruit — also ask drought and salt at flowering, not only boron.First the leaf position: new or old, even yellow or between the veins. If that does not match, do not fertilise yet. Pull one plant and read whether the roots are white, brown or foul.

A sketch. Do not fertilise from the picture alone.

Tap to enlarge. The caption says what to photograph. Missing field photos are marked as to-be-added.

Why it looks like this

The field looks like this because the root cannot take water or nutrients the usual way. Fix the soil condition first — drainage, salt, acidity, compaction or a salt of fertiliser — then a thin feed. Rates live in the range on this page; confirm with a local station and the label.

Easy to mix up

  • Looks like “Drought flower drop”

    Drought also drops flowers; boron shortage often splits stems and stops the growing point.

  • Looks like “Salt injury”

    Salt injury scorches margins with white crust; boron shortage is flowers that set nothing.

Do this / don’t do that

  1. 1Compare the worst plants with a neighbour ridge. Photograph whole plant, close-up and soil surface before you add fertiliser.
  2. 2Match roots, leaves and the soil surface to this guide. If they do not line up, do not copy a bag count.
  3. 3Use the rate range on this page only as a range. Confirm with a local station and the product label.

Don’t do this first

  • Don’t double boron; don’t broadcast borax as base without a test.

Rate range

Foliar boron

Labelled lower rate, twice

A small patch first.

Soil boron

0.5–1 kg per mu, follow a soil test

Shortage and toxicity are one sheet of paper apart.

These are ranges. Confirm with your local extension station and the product label.

Available boron

Short, or already enough

The window is narrow.

When you see Bloom without fruit — also ask drought and salt at flowering, test. If the leaf and the soil disagree, test before you pour.

Lesson video

2026-03-03 · Li Zeyu · For learning. Serious damage: local agronomist or a soil test.

For learning only. Fertiliser and pesticide decisions need a local agronomist and a soil test.

Not sure? Photograph the field to identify the problem