Why coastal conditions test young plants

Salt spray is the quiet killer in a seaside garden. Wind picks up droplets from breaking waves and carries them inland, sometimes several hundred metres, and when that salty film settles on soft new leaves it draws moisture out of the tissue. The result is what gardeners call salt burn: leaves that look scorched or glazed, with brown-black margins that crumble between your fingers. A young plant with a small root system simply cannot replace the water it is losing, so growth stalls and shoots die back.

Then there is the physical battering. Gales rock newly planted specimens until the roots tear free of the soil, a problem known as windrock. Sand and grit blast the stems. Cold onshore winds in late spring can undo a whole season's growth in an afternoon. None of this means you cannot grow a beautiful coastal garden, but it does mean that the first two or three years need a bit of protection and forethought.

Positioning: use the shelter you already have

Before you buy a single plant, walk the garden on a windy day and watch where the spume actually lands. Spray rarely reaches every corner. Walls, fences, sheds and mature hedges create a wind shadow that extends roughly four to six times the height of the barrier downwind, so a two-metre hedge shelters eight to twelve metres of ground. Plant your tender young specimens in that lee, not in the open ground beyond it.

Watch out for corners and gaps between buildings. Wind accelerates through them, so a narrow passage between a wall and a shed can be far more damaging than an open lawn. Low hollows are another trap: they collect cold air and often hold deposited salt after a storm. A slightly raised bed with good drainage usually suits young coastal plants better.

Windbreaks that earn their keep

A solid barrier seems logical but is actually a poor choice, because wind hitting an impermeable surface creates violent eddies on the sheltered side. Permeable barriers filter the wind instead, cutting its speed by 30-50% without the turbulence. Aim for something with roughly 40-50% porosity.

• Living hedges: escallonia, griselinia, elaeagnus, sea buckthorn, tamarix and olearia all shrug off salt. Plant small and they will establish faster than large specimens.
• Woven hazel or brushwood hurdles: attractive, permeable, and they last several seasons if you treat the posts.
• Netting or windbreak fabric on posts: quick to erect, effective immediately, and ideal while a hedge fills in. Sink the posts at least 60cm deep and angle the panel slightly into the prevailing wind.
• Rosa rugosa and phormium make dense, salt-tolerant screens that double as habitat.

Whatever you choose, keep it low enough to let some air through. Total calm encourages soft, sappy growth that is far more vulnerable when the wind does reach it.

Fleece, cloches and small shelters

For individual plants, horticultural fleece is the workhorse of the coastal garden. Choose a 17-30gsm grade and double it on the most exposed sites. Draped over a frame of bamboo canes or hoops, it keeps salt off the leaves, raises the temperature a degree or two and softens the wind. Peg it down firmly. Fleece that flaps itself to shreds in a gale does more harm than good, whipping stems and bruising foliage.

Bell cloches, cut-down plastic bottles and purpose-made garden cloches all work well for very small plants, but ventilate them on mild days to prevent mould and leggy growth. Once a plant is growing away strongly, remove the protection on a calm, overcast day rather than leaving it swaddled into summer, which produces weak growth that collapses at the first proper blow.

Planting and aftercare to build resilience

• Plant in spring where you can, giving roots a full season to settle before winter gales.
• Water deeply and regularly for the first two summers, always at the base rather than over the leaves.
• Mulch 5-7cm deep with composted bark or gravel. Gravel is heavier and will not blow away across a lawn.
• Stake low and loosely using a short stake, so the stem can still flex and thicken rather than being held rigid.
• Hose the foliage after a salt-laden storm and water the soil well to leach the salt through.
• Feed gently with seaweed meal or a balanced slow-release fertiliser, but avoid nitrogen-rich feeds late in the season.
• Trim damaged growth in spring, not autumn, so the old foliage shelters the crown through winter.

Plants that make life easier

Choose tough plants and you will spend far less time nursing casualties. Sea thrift, sea campion, eryngium, santolina, lavender, rosemary and hebe all take salt in their stride. Shrubby stalwarts such as escallonia, griselinia, olearia and tamarix form the backbone of a coastal border, while phormium and rosemary give structure without fuss.

One last trick: use a nurse crop. Tuck a tender young specimen among established hardy perennials or the skirt of a mature shrub, and it will borrow their shelter while it finds its feet. Coastal gardening rewards patience more than any other kind, and a plant that survives its first two winters will usually look after itself from then on.