# The spring flush

*A field note — May 2026*

Walk the same lane in early March and in late May and it is not the same lane.

In March the bank is bare. A single [lesser celandine](lesser-celandine.html) opens with the sun and closes again by four. The hedge is grey. The verge is brown. The first [queen bumble bee](queen-bumble-bee.html) is still underground, still asleep, still living off the body fat she laid down last August. By late May the same lane is a riot — hawthorn cream and dog rose pink in the hedge, cow parsley and red campion and the last of the [bluebells](bluebell.html) on the verge, the bramble opening at the edges, and the air loud with worker bumble bees who did not exist eight weeks ago.

This is the spring flush. Ten weeks. The entire reproductive year of much of British flora, compressed into a single window between the last frost and the canopy closing.

## Why now

Most of what flowers in spring is racing the leaves. The bluebell, the wood anemone, the wild garlic, the lesser celandine — every one of them is a woodland-floor species, and every one of them has to finish its work before the oak and the beech and the ash unfurl their canopies and put the woodland floor into shade for the next six months. The window is short. The light is borrowed. The deadline is fixed.

The hedgerow species — blackthorn, hawthorn, bramble — are racing a different clock. They have to flower in the gap between the last hard frost and the heat that dries the nectar in shallow flowers. They have to do it when the pollinators are out and warm enough to fly. They cannot wait for June; June is for fruit-set.

Everything you see in flower between March and late May has converged on the same window for the same reason. Compete or perish. Flower now, or wait a year.

## What it feeds

A queen bumble bee comes out of hibernation in March having burned through most of the body fat she laid down in August. She needs nectar within hours of emergence. The lesser celandine and the willow catkins are what she finds. Then the [dandelion](dandelion-evolution.html). Then the fruit blossom. Then the [dead-nettles](dead-nettle.html). Each one is a different species opening just as the previous one tails off, and the sequence is what carries her through to a nest site and a first clutch of eggs.

The [orange-tip butterfly](orange-tip.html) has its six-week flight against ten months of chrysalis, and the entire flight is inside the flush. The first solitary mining bees are on it — short-lived, narrow-spectrum, dependent on whichever single plant they evolved alongside. The brimstone that wintered as an adult under an ivy leaf is feeding up. The blue tit is timing her brood to the first hatch of caterpillars off the new oak leaves, and the oak leaves themselves are in the flush.

The whole British food chain at this end of the year is pinned to those ten weeks.

> Rough winds do shake the darling buds of May,  
> And summer's lease hath all too short a date.
>
> — William Shakespeare, *Sonnet 18*

## What threatens it

A late frost. A dry spring. An early heatwave that ends the flush a fortnight short of when the workers are out in numbers. The agricultural calendar that flowers the [oilseed rape](oilseed-rape.html) so tightly that two weeks of industrial-scale nectar flood, and then leaves the rest of the landscape to fend for itself. The roadside management that cuts the cow parsley before the seed has set. The garden tidiness that strips out the dead-nettle and the dandelion and replaces them with sterile cultivars that flower in colours the bees cannot see properly.

The flush is the most concentrated act of the British natural year. It is also one of the easiest to interrupt.

## What it asks of you

Go and look at a hedgerow you walked past in March. Stand in the same place. Count the species in flower within ten feet. The answer in March was zero or one. The answer today might be eight or nine.

In two weeks the bramble will be taking over from the hawthorn. The foxgloves will be coming. The bluebells will already be going to seed. The flush is closing.

By June it is the second act, a different cast — clovers, thistles, knapweeds, the lime trees if you have them. Productive in its own way, but slower, broader, less urgent.

The sprint runs through nature. The hare bolts. The fox lunges. The kestrel stoops. The flush belongs to the same family — a short, decisive act, with the leader changing by the day, certainly by the week.

Watch it now or wait until next March.