Almond

Prunus dulcisRosaceaeTree

The plant behind the largest managed pollination event on earth. California's almond orchards require roughly two million honey bee colonies every February — a substantial fraction of all managed hives in the United States, trucked across a continent for a three-week window. Almond is entirely dependent on insect pollination and largely self-incompatible, which is what makes the requirement so extreme.

Value to bees

Nectar
Very high
Pollen
Very high
As a honey crop
Minor honey crop — a surplus only locally or occasionally
Which bees, and why
The most concentrated managed pollination event in world agriculture. The scale creates real problems — colonies from across a continent mixing in one valley is an efficient way to move disease, and the almond bloom is followed each year by measurable losses. Blue orchard bees are increasingly deployed alongside honey bees because they fly in the cool damp weather almond flowering often brings.

Open cup-shaped flowers with fully exposed nectar and pollen, usable by every bee.

Worth knowing
Top-rated for both, at the single most valuable moment of the year for a colony coming out of winter. That is precisely why the pollination market exists.

As a crop

Dependence on animal pollinators
Not classified in the sources read
In the United States
Honey bees: pollen highly attractive, nectar attractive in some conditions. Bumble bees: attractive in some conditions. Solitary bees: Osmia. Needs bee pollination: yes; managed pollinators used: yes.
Worth knowing
Cross-pollination is essential for most cultivars (IPBES), and self-fertile cultivars now exist. The IPBES assessment cites about 1.7 million hives moved into California for a six-week bloom — the largest managed pollination event in the world.

Sources: Attractiveness of Agricultural Crops to Pollinating Bees for the Collection of Nectar and/or Pollen. Every crop compared.

Flowering

Typically in flower
February to March (northern hemisphere)

Very early — the first substantial tree flow of the northern year, and vulnerable to frost and rain in a way that makes it a commercial emergency rather than an inconvenience.

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

When nectar flows
Copious nectar and abundant pollen, at a point in the year when almost nothing else is open. Cold or wet weather during the bloom prevents bees flying and can cost a grower the crop outright.
Year-to-year variation
Reliable in flower and rarely a honey surplus — the flow arrives when colonies are at their weakest after winter transport, and is generally left on the hives as build-up feed.

What it does to the honey

Almond nectar produces a distinctly bitter amber honey with a marzipan aroma — one of very few honeys where bitterness arrives before sweetness.

Growing it

Conditions
Full sun, free-draining soil, and a warm dry summer. It flowers so early that frost is the limiting factor in most temperate climates.
Size
4-10 m.
Native range
Central and southwest Asia, cultivated around the Mediterranean for millennia and now grown at vast scale in California.
Suits
Small gardens, Large gardens, Orchard
  • Plant it for the blossom rather than the nuts in most of northern Europe — it flowers reliably and sets fruit rarely.
  • Two varieties are needed for a crop; almond is largely self-incompatible.
  • Susceptible to peach leaf curl in wet springs, which is the usual reason a garden almond looks miserable by June.

What it looks like

A small spreading tree flowering on bare wood in late winter, in a mass of pale pink or white five-petalled blossom, followed by narrow leaves and the grey velvety fruit that splits to release the nut.

Sources

  • Assessment Report on Pollinators, Pollination and Food Production — Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services (IPBES) (2016) · Systematic review Link
  • HoneyHQ editorial synthesis — HEKNO Ltd · HoneyHQ synthesis

How sources are selected and weighted is set out in the sources and evidence policy.

Guides covering this plant

Tools for planning planting

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