Repetition: The Quietest Trick in Garden Design

What repetition actually does

Variety thrills the eye. Repetition rests it.

Put a plant in one place and it is an incident. Put the same plant in five places along a border and it becomes a line, and that line does two things at once. It carries the eye down the garden, which makes a small space feel longer. And it gives everything else permission to be varied, because there is now a thread holding the whole thing together.

This is why a wildflower meadow does not look chaotic and a bed containing forty different perennials usually does. The meadow repeats a handful of species thousands of times. The bed repeats nothing.

The new gardener buys one of everything. The collector buys seven of fewer things. The difference in the finished garden is enormous, and it is not about money — seven of one plant costs no more than seven different ones.

Choosing the repeaters

The plants you repeat carry the garden, so they must be the reliable ones, not the interesting ones. Judge a candidate on three counts:

• Season length. Anything you repeat should be doing visible work for at least four months. A plant with three good weeks, repeated, gives you three good weeks and then a repeated absence.
• Reliability in your conditions. If it will thrive in the dry end of the border and sulk in the wet end, it cannot be your repeater.
• Form over flower. Repeat shapes and textures — a dome, an upright grass, a broad leaf. Colour changes through the season; form does not.

Keep the interesting, tender and collected plants for the 30 per cent, and put them where you will actually stand: beside the door, along the path, at the point where you turn.

Drifts, dots and the shape of a group

A single plant is a dot. Three of the same plant, touching, is a drift — the smallest unit the eye reads as intentional at a distance. As a rough guide, a group needs to be at least as wide as the plant is tall to register from ten metres away.

Rhythm can be regular or irregular. Regular — one clipped dome every four metres — reads as formal and calm, and is the right answer beside a path or a terrace. Irregular is better in a naturalistic border: repeat at four metres, then six, then three. A metronome is not a melody. Two practical points. Let drifts run diagonally into the border rather than sitting in tidy blocks parallel to the front edge; the planting then interlocks instead of stacking. And repeat across a gap — the same plant on both sides of a path or an opening will tie two areas into one space.

One grass everywhere

If you take only one tactic from this article, take this one. Choose a single grass and use it more often than feels sensible.

Grasses read as texture rather than colour, so they never clash with anything. They move, which gives a still garden life on a windy day, and we have no shortage of wind. Most of them stand through winter, so the repetition continues when the flowers have gone. Calamagrostis x acutiflora 'Karl Foerster' is the most upright and the most useful for structure; Molinia caerulea subsp. caerulea 'Edith Dudszus' is lighter and native in feel; Hakonechloa macra does the same job in shade; Deschampsia cespitosa is happy on damp Irish ground.

A worked repeating palette for an Irish garden

For a small to medium garden with a mix of sun and light shade, six repeated elements are plenty:

• Taxus baccata clipped into low domes, 600–800mm, one roughly every four to five metres — the full stops in the sentence. Ilex crenata does the same job on lighter soils.
• Calamagrostis x acutiflora 'Karl Foerster', in threes, four or five groups down the garden.
• Geranium 'Rozanne' along the front edge, repeated in fives — long-flowering, and it will not stop until the cold does.
• Verbena bonariensis scattered through, tall and see-through, and it repeats itself by seeding.
• Allium hollandicum 'Purple Sensation' threaded in fifteens for a May and June thread.
• Hydrangea paniculata 'Limelight', three plants evenly spaced, doing the shrub work from July into winter.

That is the 70 per cent. Everything else — the special rose, the tree peony, the thing you could not resist at the nursery — goes into the remaining space. If you are unsure whether a plant is worth repeating, come and ask us; it is usually the question worth asking before the plant is bought.