Fieldcraft before pencilwork

The best wildflower sketches begin with clean boots. If you are heading to a limestone pavement, a chalk down, a dune slack or a fen, the plant you have come to draw may be the only specimen for miles. A careless kneel can crush a seedling that took a decade to appear, and compressed moss or soil can take years to recover. So the first discipline of botanical sketching is not line or colour — it is where you put your weight.

Stay on established paths and boardwalks where they exist. Work from the edge of the colony rather than its heart, and remember which flowers are fragile for different reasons: orchids have delicate underground tubers, alpines and dune plants have brittle roots in shallow, unstable ground, and anything in a bog or flush sits on ground that bruises indelibly under a boot.

Let the hand lens do the walking

A good x10 hand lens is the single most useful piece of kit you can carry, because it lets you record detail without ever moving closer than the path edge. Fold it out, hold it close to your eye, then bring the plant towards it rather than the other way round — the flower will snap into focus and you will be looking at hairs on a stem, the shape of a sepal tip, or the way an anther opens.

Sketch those details as small, separate studies around the main drawing: a leaf margin, a seed pod, the underside of an umbel. Ask permission from the plant, in effect, by never lifting a stem into a position it would not naturally hold, never bending a flowering head back on itself, and never pinning anything with a cane or marker. A lens, a steady hand and a kneeling mat placed on bare ground beside the path will give you more information than a whole afternoon wandering among the flowers.

If you need to see beneath a leaf, use a small pocket mirror on a stick and slide it under gently, or lie on your side at the edge of the colony with your weight on the path.

Photographs as your sketchbook's memory

Photographs should supplement your drawing, not replace your looking. Take a clear overall shot for habit and habitat, a mid-range shot for flower structure and leaf arrangement, and a close shot for the diagnostic detail. A hand lens held over a phone camera lens is a surprisingly effective macro trick when you are working at arm's length.

• Photograph the whole plant in its setting, then a leaf, then a flower from the side as well as the front.
• Include a scale reference — a coin, a rule or your fingertip — and keep notes of colour and scent, which no camera captures honestly.
• Photograph habitat and associates: the plants growing alongside are often as diagnostic as the plant itself.
• Keep location data out of anything you post publicly. Rare plants are vulnerable to collectors, so a picture with a recognisable landmark can do real harm.

Drawing from memory and from the kitchen table

Memory sketching is not a compromise; it is a skill, and it sharpens your observation faster than any other practice. Before you leave a plant, sit back on the path and draw it from where you stand, working quickly — two or three minutes of gesture, capturing the angle of the stem, the balance of the flower spike, the direction the leaves turn. Add a few words beside the drawing: "petals pale lilac, veined darker, spur curved down." Those notes will bring the plant back to you weeks later, and the mental image will hold far more detail than you expect.

At home, work up finished studies from your photographs, notes and memory. Compare the result with a field guide or a flora, and where you are unsure, mark the uncertainty rather than inventing a tidy answer. A sketchbook full of honest question marks is more valuable than one full of confident errors.

When the site is sensitive

Many of our richest botanical sites are Sites of Special Scientific Interest, National Nature Reserves or land under a conservation covenant. On these, consent is needed for operations likely to damage the special features, so if you plan to linger, to bring a group, or to work in a wet flush or on bare limestone, ask the site manager or the county recorder first. They will often tell you exactly where to stand, which is genuinely useful information as well as a courtesy.

Never collect. Under the Wildlife and Countryside Act 1981 it is an offence to uproot any wild plant without the landowner's permission, and a small number of our rarest species are protected from picking, uprooting and even intentional damage. Sketching leaves the plant exactly where it belongs, which is one of the quiet pleasures of the practice.

A kit that keeps you light on the ground

• A x10 hand lens on a cord, and a spare if you can manage it.
• A hardbacked A5 sketchbook and a couple of pencils, plus a waterbrush and a small tin of watercolour pans.
• A kneeling mat or square of foam — you will kneel far less, and damage less, if kneeling is comfortable.
• A phone or compact camera, and a notebook for colour, scent and weather notes.
• Stout boots with a good tread, and a walking pole if the ground is uneven.

Draw slowly, tread lightly, and leave the site exactly as you found it — the flowers will be there for your next visit, and for the sketchers who come after you.