A potager is the French answer to the kitchen garden: vegetables, herbs and cut flowers arranged with the same care you would give a rose border. It is orderly rather than rustic, edible rather than ornamental, and it works beautifully on a narrow British plot because it depends on geometry rather than on space. Where a cottage garden needs room to sprawl, a potager needs only a clear axis, a few rectangles and a firm hand with the shears.

The measurements below assume a plot roughly 3–4 metres wide and 8–10 metres long, though the principles scale down happily to a 2-metre-wide strip behind a terrace.

Start With the Bones: Beds and Paths

Everything in a potager begins with the path. Run a single straight path down the length of the plot, roughly 60–75cm wide, and set your beds either side of it. That width lets you walk comfortably and push a wheelbarrow; anything narrower than 45cm becomes a nuisance by July.

• Bed width: keep beds to 90cm–1.2m so you can reach the middle from both sides without treading on the soil. Compacted soil is the quiet killer of vegetable yields.
• Cross paths: on a plot over 7 metres long, add one or two perpendicular paths to divide the space into four or six beds. This is what creates the French rhythm — small, repeated rectangles rather than one long strip.
• Orientation: run beds north to south where you can, so both sides get sun through the day. Fruiting crops need six hours of direct light; salads, parsley and mint will manage on four.
• Marking out: use a string line and a bag of sand before you dig a thing. Check the diagonals of each bed are equal — that is the only reliable way to get true right angles.
• Soil preparation: spread 5–8cm of well-rotted manure or garden compost over the bed areas and let the worms work it in. If your plot sits on clay, consider raising beds by 20–25cm with timber or brick edging.

Give It Structure With Low Box Hedging

The clipped hedge is what separates a potager from an allotment. Traditionally this is dwarf box, Buxus sempervirens 'Suffruticosa', kept to 20–25cm high and 20cm wide. Plant it in spring or early autumn, 20–25cm apart, and water it well through the first summer.

Be realistic, though: box blight and box tree moth have made life difficult for British gardeners. If you would rather not gamble, Japanese holly (Ilex crenata 'Dark Green') clips into an almost identical low line, as does Lonicera nitida 'Maigrun'. Wall germander and dwarf lavender give a looser, more fragrant edge and suit a gravel garden particularly well.

Two rules keep a low hedge looking sharp. First, trim it twice a year — late May and late August — with sharp shears rather than a powered trimmer, which shreds the leaves and browns the edges. Second, cut the sides very slightly sloping inwards towards the top, so that light reaches the lower foliage. A hedge that is wider at the top will thin out at the base within three years.

On a narrow plot, resist the urge to hedge every bed. Line the main path only, and let the cross paths do their work unadorned.

Gravel Paths That Earn Their Keep

Gravel is the potager's natural floor: pale, quiet, and forgiving of a watering can. For a path you will use daily, build it properly rather than tipping a bag onto bare soil.

• Excavate to about 10cm and compact a 5cm layer of Type 1 sub-base.
• Add a 3cm grit layer, then finish with 3–4cm of 10mm pea gravel or 8–12mm shingle.
• Edge the path with steel strip or clay pavers set on edge. Without an edge, gravel migrates into the beds and soil migrates into the gravel within a season.
• Rake the surface twice a year, top it up every two to three years, and hoe out weed seedlings in dry weather — far easier than lifting a membrane later.

If you want something firmer underfoot for a seating area, self-binding gravel or a resin-bound surface will take a bistro table and chairs without sinking.

Planting the Beds: A French Palette for Small Spaces

French kitchen gardens pair the productive with the pretty, and never leave a bed bare. Sow in blocks and rows rather than broadcast, and interplant quick crops with slow ones — radishes between carrot rows, lettuces between brassicas.

• Vegetables: cut-and-come-again salad, 'Cocarde' and 'Rouge Grenobloise' lettuces, beetroot, French beans, courgettes, tomatoes, garlic and shallots.
• Flowers: French marigolds, nasturtiums, calendula, cornflowers and sweet peas. These draw in pollinators, confuse pests and give you something to cut.
• Herbs: thyme, sage, rosemary, chives and parsley at bed corners. Keep mint in a sunken pot or it will take the plot.
• Vertical space: on a narrow plot the boundaries are your best ground. Espalier an apple or pear along a south-facing fence, and train climbing beans up hazel wigwams or obelisks at the path junctions.

Sow salad every two to three weeks from March to August for a continuous supply rather than one glut.

Watering, Feeding and the Winter Silhouette

Mulch beds with 5cm of compost in late spring to hold moisture, and water in the morning at the base of the plant rather than over the leaves. A soaker hose laid along the beds and covered with gravel or mulch is the least conspicuous way to keep everything alive through a dry July.

Feed hungry crops fortnightly with a diluted comfrey or tomato feed once flowering begins, and top-dress beds each autumn with compost and a light dusting of blood, fish and bone.

In winter the potager should still look deliberate. The clipped hedges hold their line, gravel reads bright against bare soil, and evergreen herbs keep their shape. Plant a pair of standard bay or rosemary in pots at the end of the main path, and set a small table and two chairs on a square of paving there. That final flourish, a place to sit at the end of the axis, is what turns a working plot into an outdoor room — and it is the most French gesture of all.