Sweet chestnut

Value to bees

Nectar

High

Pollen

Very high

As a honey crop

Major honey crop — yields a surplus in good years

Which bees, and why

The catkins are worked heavily by honey bees and by a wide range of flies and beetles. The strong, faintly unpleasant scent of chestnut in flower is a genuine insect-attraction strategy rather than an accident, and it is noticeable from some distance.

Nectar and pollen are fully exposed on the catkin, so access is universal — no corolla tube to exclude short-tongued insects.

Worth knowing

An exceptional pollen source — the catkins shed enormous quantities — and a good nectar source in the right weather. The pollen arrives at a useful moment for colonies building towards late summer.

Flowering

Typically in flower

June to July (northern hemisphere)

Two to three weeks at a given site, later at altitude. It arrives in the gap after the spring flows and before the late summer ones, which is part of its value to beekeepers.

A typical window for the species, HoneyHQ synthesis — it moves with latitude, altitude and the year.

When nectar flows

Nectar secretion needs warmth and humidity together. A hot dry spell during flowering suppresses the flow badly, which is why chestnut honey yields swing so hard between years.

Year-to-year variation

Substantial in a good year across the chestnut regions of Italy, France, Spain and the Balkans, and close to nothing in a dry one. Chestnut blight and ink disease have also reduced the standing resource significantly over the last century.

Sourced periods for this plant

Read from a source for the place named, and kept apart from the typical windows elsewhere on HoneyHQ, which are synthesis. Flowering, nectar flow and harvest are different periods.

• Nectar flow: Sweet chestnut — June–August

  Corsica (the PDO area), France · northern hemisphere · Season words; months derived · Protected-name specification

  Among the island's seasonal nectar staples, "chestnut at the start of summer" (HoneyHQ's translation from the French of the Corsica specification).

  The specification says the start of summer; the whole season is drawn, because it does not say which month it means. The quantity varies with the year's weather.

  Source: Cahier des charges de l’appellation d’origine « Miel de Corse – Mele di Corsica ». Checked 2026-10-31.

• Nectar flow: Sweet chestnut — June

  Corsica (the PDO area), France · northern hemisphere · Months as stated · Beekeeping authority

  Some of the colonies made early in the season "can go into production on the chestnut flow (mid-June)" (HoneyHQ's translation from the French of the beekeeping institute's case study).

  The study places the flow in mid-June and gives no end month, so only June is drawn. Since the chestnut gall wasp arrived in 2010 the chestnut flow has become less reliable, the study notes.

  Source: Cas-type apiculture — Corse : miel en AOP et vente en demi-gros. Checked 2026-10-31.

Every sourced period, on the honey atlas

What it does to the honey

Chestnut nectar carries the tannins and phenolic compounds that make chestnut honey bitter, dark and long-finishing. It is the clearest European case of a honey that is prized precisely for a quality — bitterness — that a general audience would call a fault, and the bitterness is the tree's chemistry arriving essentially intact.

Growing it

Conditions

Deep, well-drained, acid to neutral soil and a warm summer. It dislikes chalk and shallow soils, and needs more heat than northern Britain reliably provides to set good nuts.

Size

20-35 m; individual trees can live over five hundred years.

Native range

Southeastern Europe and Asia Minor, spread across western Europe in antiquity — largely by the Romans — and now naturalised well beyond its original range.

Suits

Large gardens, Orchard

• Far too large for a small garden — this is a parkland and woodland tree, and a mature specimen will shade out everything under it.
• Coppiced sweet chestnut, still widely managed in southern England for fencing, flowers very little: the cut cycle removes the mature wood that would otherwise bear catkins.

What it looks like

A broad, deeply furrowed-barked tree with long glossy toothed leaves, and conspicuous pale yellow-green catkins up to 25 cm long in midsummer. Old trees develop a characteristic spiral twist in the bark.