Why Evergreens Earn Their Keep

By December most of the garden has packed up and gone home. The herbaceous border is a flattened mess, the roses are sticks, and the lawn looks like it has been left out in the rain since October. What holds everything together at this point is evergreen structure — the quiet, dependable framework of foliage that stays put while everything else collapses around it. A winter garden is not really about flowers, although a few help. It is about shape, silhouette and texture, and evergreens are the only plants that will give you these reliably through to March.

The trick is not to plant a wall of dark green and hope for the best. Aim for a deliberate mix of forms and heights so that the eye has something to travel along in the low winter light.

Start with the Bones: Cones, Columns and Mounds

Think of your evergreens as architectural elements rather than individual plants. Three basic shapes do most of the work.

• Cones and pyramids — the classic conifer silhouette. They give height, a pointed top and a sense of formality. Use them as vertical accents, flanking a path or gate, or repeated along a boundary.
• Columns and spires — narrow and upright, ideal for tight spaces and for adding height without bulk. A pair of columns frames a view beautifully.
• Low mounds and cushions — the ground layer. They soften the base of taller plants, cover bare soil and stop the whole thing looking like a cemetery of upright cones.

A useful guideline: for every tall cone or column, allow two or three low mounds around its feet. This three-to-one rhythm stops winter plantings looking sparse and gives depth without crowding.

Reliable Evergreens for British Conditions

Our winters are rarely brutally cold, but they are damp, grey and often windy — and that combination sees off more plants than frost ever does.

For structure, yew (Taxus baccata) is hard to beat. It clips beautifully, tolerates shade and root competition, and has been holding British gardens together for centuries. Portuguese laurel (Prunus lusitanica) makes a dense, glossy evergreen screen and enjoys our climate more than its cherry-laurel cousin, which sulks in cold, wet spots.

For columns, Thuja occidentalis 'Smaragd' keeps a neat, narrow habit and rich green colour, while junipers such as Juniperus scopulorum 'Skyrocket' give a slim, blue-grey spire that reads well against a wall or fence. Lawson cypress cultivars offer a huge range of golds, blues and greens if you want colour in the framework.

For the low mound layer, box remains the gold standard, though box blight and the box moth caterpillar mean many gardeners now use Japanese holly (Ilex crenata) or Lonicera nitida instead. Hebes are excellent in milder coastal and southern gardens, and dwarf pines such as Pinus mugo bring a rugged, almost alpine quality to gravel or raised beds.

Layering for Depth and Interest

A winter garden should have three clear layers working at once. At the back, the tall evergreens — columns and cones — form the enclosure. In the middle, rounded shrubs and small trees such as Skimmia japonica or Fatsia japonica add volume and contrast, especially with their bold, tropical-looking leaves. At the front, low mounds and ground cover knit the picture together.

Within these layers, mix foliage textures. Needle-like conifer foliage sitting next to broad, glossy leaves such as holly or Sarcococca creates far more visual interest than any flower could in January. Add a variegated or golden evergreen here and there — a splash of Euonymus fortunei 'Emerald 'n' Gold', for instance — to catch low winter sun and lift the whole scheme.

Don't forget that structure can also be supplied by non-conifer evergreens: ferns like Polystichum for shade, bergenia for ground cover, and the surprisingly elegant sweet box, whose glossy leaves hide tiny, intensely fragrant flowers in midwinter.

Planting, Drainage and Wind

British gardeners face one common killer in winter: waterlogged roots. Most conifers and evergreen shrubs hate sitting in cold, wet soil, and by February the damage becomes obvious as yellowing, dropping foliage.

Before planting, work in plenty of organic matter and, on heavy clay, add grit to the planting hole to improve drainage. Plant slightly proud of the surrounding soil on difficult ground so water runs away from the crown. Mulch generously, but keep it clear of stems and trunks to avoid rot.

Wind is the other enemy. Cold, dry easterly winds strip moisture from evergreen leaves faster than roots can replace it, causing browning that lasts until new growth covers it. On exposed sites, plant a windbreak of tough evergreens, or use a permeable barrier rather than a solid fence, which simply creates damaging turbulence behind it.

Care Through the Cold Months

Winter is a quiet time for maintenance, but a few jobs pay dividends.

• Water newly planted evergreens during any mild, dry spells — they are still losing moisture through their leaves.
• Brush heavy snow off upright conifers before it bends or snaps branches.
• Firm any plants lifted by frost heave, especially in bare or newly cultivated ground.
• Delay hard pruning until late spring, but remove any damaged or crossing branches on a dry, mild day.
• Check ties and stakes after gales, and loosen any that have become too tight.

Get the evergreen framework right and the rest of the garden has something to lean on — not just in winter, but all year round. The summer flowers will come and go, but the cones, columns and mounds will be there, quietly doing the work.