Why a spring journal is worth the effort

Phenology is the study of timing — when things happen in the natural year — and it is the cheapest, most rewarding science you can do on foot. Spring does not arrive in one go. It unfolds in a series of small events: the first hazel catkins, the first mistle thrush in song, the first blackthorn flower, the sudden arrival of a chiffchaff's two-note call. Individually these mean little. Written down, year after year, they become a record of how your own corner of Britain is responding to the seasons — and, more immediately, a reason to look harder.

Choose one patch and keep the routine small

The commonest reason journals fail is ambition. Don't commit to the whole county; commit to a patch you can walk in twenty minutes. A back garden, an allotment hedgerow, a churchyard, a stretch of canal towpath, or the edge of a housing estate where a brook runs under a road. Walk the same route in the same direction, at a similar time of day — early morning is best for birdsong, midday for bees and butterflies. Two or three visits a week from February to the end of May is plenty. Name the landmarks: the broken gate, the leaning willow, the south-facing wall. Those fixed points are what make your records comparable from week to week.

Buds, blossom and leaves: the green timetable

Start with trees and shrubs, because they hold still and let you look properly. Learn a handful of species well rather than many badly — hazel, blackthorn, hawthorn, horse chestnut, oak, ash and elder will carry you through most of lowland Britain. Record the stage, not just the date: buds swelling, buds breaking, first leaf unfurled, first flower open, full blossom. Then note what you see:

• Hazel catkins lengthening from tight green lambs' tails to loose, dusty yellow ones.
• Blackthorn flowering before its leaves — a froth of white on bare black twigs — usually a fortnight or so ahead of hawthorn.
• Hawthorn's first green haze, then the May blossom itself.
• Horse chestnut buds splitting to show the varnish-shiny leaf, then the upright "candle" flower spikes.
• Oak and ash breaking, and the old country saying about which leafs first — worth testing on your own patch rather than trusting.

Birds and insects: the moving signs

Birds give your journal its sound. Note the first day you hear a song thrush singing properly, the first drumming woodpecker, the first blackcap or willow warbler. Summer visitors arrive in a rough order: chiffchaff and sand martin early, then swallow, then house martin, then swift. Listen, then look — "first chiffchaff, 14 March, singing from the tall ash by the bridge" is worth far more than a tick on a list.

Insects reward warm, still days. Look for the first queen bumblebees quartering the lawn in March, the first brimstone or peacock butterfly, orange-tips on cuckooflower, the first ladybirds and hoverflies. Kneel down and check nettle patches and dead-wood piles; if frogs spawn in your pond, date that too.

Setting out the page and sketching outdoors

Keep it simple enough to actually use. A plain A5 notebook with a weatherproof cover beats a beautiful leather one you're afraid to get muddy. Give each visit a few lines: date, time, temperature, wind, cloud, a short list of firsts, and a small box for a sketch. Record abundance roughly — one, a few, many — because a first date plus numbers tells a far better story than a bare date.

Sketching is where the journal stops being a list and becomes a habit of attention. You need not be good at drawing. Work in pencil, keep it small, and give yourself five minutes: a single twig of blackthorn, the shape of a catkin, the angle of a bumblebee on a flower. Draw the thing in front of you, not the idea of it. A cheap kit is best — a 2B pencil, a small eraser, a fine-liner, and a water brush with a tiny tin of colour if you fancy adding a wash later at the kitchen table. Wear gloves with the fingertips cut off, sit on a folded bin bag, and keep the lines loose. If your fingers go numb, stop and finish the notes at home.

Reading your records at the end of spring

Come June, read the whole thing through with a cup of tea. Underline the first dates and put them in a simple table at the back: species, first date, notes. Next year you'll have something to compare, and the comparisons are where the interest lies — did the hawthorn open a fortnight later? Did the swifts arrive in the same week? Your patch will have its own personality: a sheltered south-facing wall may run a week ahead of the open field, and a town centre can be a fortnight ahead of the surrounding countryside. Thousands of small notebooks, kept honestly, add up to something far larger than any one of us can see from a single garden gate.