Camellia hedges: the flowering screen that works in shade

Most hedges are a wall. A camellia hedge is a wall that flowers through the coldest part of the year, when the rest of the garden has nothing to say.

The catch is that camellia is two plants wearing one name, with a third between them. Hedging succeeds or fails on knowing which is which.

Sasanqua: the hedging camellia

Camellia sasanqua takes more sun, grows faster, carries smaller leaves and flowers autumn into winter. It clips into a tighter formal face than a large leaved japonica ever will, and for a flowering hedge along a fence it is the answer almost every time.

Within the group it is colour and habit. Yuletide is single red with a gold stamen boss, narrow in the shoulder, opening late enough to hold red after the autumn varieties finish. Plantation Pink is the single mid pink for when the hedge has to be structure, with enough scent to earn a spot by a door. Pure Silk is white flushed pink at the edge and more even in habit, which is what you want repeated forty times along a fence. Setsugekka is larger and wavier on a looser frame, and Julie Anne covers the soft pinks.

Plant one variety and order the whole run at once from one grade; a line assembled over two seasons never quite matches.

What bred-for-hedging actually means

Paradise Blush and its sibling Paradise Pearl came out of a breeding programme on the New South Wales Central Coast, selected on the frame rather than the bloom, which a show bench cultivar never has to be. They were picked for small leaves, short internodes and a habit of answering a cut with side shoots rather than one leader. That is what keeps a clipped face flat and the base furnished.

Japonica: the shade performer

Camellia japonica is slower, larger-leafed, and flowers winter into spring with bigger blooms. It wants morning sun or bright shade; hot afternoon sun scorches leaves and browns flowers. That limitation is also its superpower: japonicas flower where most shrubs will not, on the south side of the house, under high canopy, the shadowed side of a fence. Deep shade is a different thing, and Something Special flowers sparsely in real gloom.

Most japonicas suit an informal screen or backdrop layer. The narrow, small leaved ones are the exception: Black Tie is near black, formal and tight enough to hold a clipped line. Great Eastern is the opposite, a large loose red Australian nurseries have grown for well over a century, and it builds real width, so it belongs at the back of a shaded bed rather than a strip beside a path. The flecking on Emperor of Russia Variegated is virus induced, stable, and propagated deliberately. Star Above Star is a sasanqua type despite the layered flower, and the tea plant, Camellia sinensis, clips into a hedge you can harvest.

The third group nobody mentions

Between them sits the hiemalis group, sold as sasanqua and not behaving like one. Camellia hiemalis hiryu takes sasanqua willingness to be cut and japonica substance in the crimson semi-double bloom. It starts after the sasanquas are underway and runs through the cold months, so buyers expecting autumn flower call it late when it is just a different group.

Choosing between the main candidates

Petal fall decides as much as colour: most sasanquas shatter petal by petal and sit happily over paving, while japonica blooms fall whole and mark pavers. For counts, see how many plants a hedge needs.

Where camellias are easy, and where they are not

The Dandenongs, Mount Macedon, the Adelaide Hills and the Southern Highlands grow camellias with least argument.

Brisbane and the humid subtropical coast grow sasanquas well, japonicas only in real shade. The problem is not heat, it is petal blight: in a warm wet spring the blooms rot from the centre outward, and the fungus carries over in the spent petals underneath. No spray fixes it, so rake them up and bin them.

Melbourne's western basalt clay is a drainage problem, and the answer is a mound. Canberra, Orange and the tablelands freeze japonica buds overnight; the wood takes that, but morning sun on a frozen bud browns the flower, so plant east-shaded. Sasanquas flower earlier and dodge it.

Be honest about the Adelaide plains and the calcareous sand behind the Perth coast. Limestone sits above the pH a camellia works in, and hard water pushes it further alkaline each year. The symptom is a pale leaf blade with green veins and no new growth, uneven along a run. Feeding will not repair it; on limey ground, use pots of camellia and azalea mix.

Soil, planting depth and feeding

All camellias want the same root zone: slightly acid, free-draining soil with organic matter and permanent mulch. In heavy clay, never plant into a pit; a hole backfilled with light mix holds water like a bathtub. Improve the whole run, raise it, and mound the root ball.

Planting depth is the failure that never announces itself. The top of the root ball goes at or slightly above finished level, with a clear ring of bare soil at the stem. Buried a hand's width too deep, the collar stays damp, the bark rots under the mulch where nobody looks, and the plant declines over two or three seasons with nothing above ground to explain it.

Feed twice: a camellia and azalea fertiliser behind the cut, and a lighter second dose in late summer as the buds swell, onto damp ground. Camellia roots sit in the top 100mm to 150mm of soil under the mulch, exactly where a scattered handful of lawn feed lands.

Pruning: the timing rule

Camellias set next year's buds in late spring and summer, so the pruning window is immediately after flowering and no later. Clip a sasanqua hedge with two or three light passes after flowering rather than hard once a year, and it is dense and budded again by autumn. Trim japonicas lightly, for shape. Prune in summer and you cut off next winter's display, which explains most camellias that never seem to flower.

Renovating an old plant

Here the groups part company. Japonicas break from cuts made into bare older wood, so an overgrown Great Eastern is recoverable: take a third to a half of the framework the first year, straight after flowering, then let it refurnish. Sasanquas reshoot from bare wood slowly, so one cut back to sticks sits there looking like sticks.

Sizing: what each grade buys you

Growth is slow, so the grade you plant decides when the hedge closes over. Pot sizes convert to volume cubically, so the gap between grades is wider than it looks: 140mm holds about 1.5 litres, 200mm about 4.4, 300mm about 15 and 400mm about 35. Small grades start around $16.95; large containerised stock runs past a thousand dollars a plant. Plantation Pink and Pure Silk cover that whole range; Beatrice Emily and Paradise Pearl come only in small and mid grades, so they are meant to be shaped from year one.

The first two summers

Plant in autumn where winters are mild, in spring in cold districts, and put the hedge on its own irrigation line. Pop-ups on short daily cycles wet the mulch and no further; check with a finger through it.

Competition is the bigger problem. A fence line is usually where the established trees already are, and their root mat occupies the top 300mm of soil along its whole length. A camellia dropped into that in a pot-sized hole stays the size it arrived at. Cut a wide continuous trench and improve all of it, but not into the roots of a mature eucalypt, or of a tree you do not own or the council protects. Where the roots are too heavy to cut, a raised bed along the fence beats fighting for the same soil.

What goes wrong later

Bud drop is the most common complaint, and it is nearly always water stress in late summer and autumn while the buds form. Nobody diagnoses it, because cause and symptom are months apart: a dry fortnight in February shows up as a bare July.

In a pot the failure is mechanical. A root ball once allowed to dry shrinks from the container wall, and every watering after that runs down the gap and out the drainage holes. The tell is water at the base a second after the hose goes on; stand the pot in a tub until the mix stops bubbling.

Scale turns up in exactly the still shaded positions camellias get planted into. Colonies build on the undersides of leaves, sooty mould grows on the honeydew, and the bush goes grey long before anyone turns a leaf over. A narrow hedge planted hard against a fence is the worst version: the inside face never dries and never gets inspected. Treat with horticultural oil on a mild overcast day, covering the undersides, since it smothers on contact.

What to plant with it

What goes in front wants the same conditions: acid soil, shade, and a root zone nobody digs. Hydrangeas carry summer in the beds camellias occupy in winter, so the two cover opposite ends of the year. Japanese maples take the layer above out of hot dry wind, and ferns and liriope hide the base of a hedge while it builds. More in plants for shade.

Planning the planting

A shaded fence line: japonicas at a metre. A garden flowering April to October: autumn sasanquas, then hiemalis, then japonicas into spring, with a deciduous magnolia on bare wood to finish.

The full list, from starter pots to advanced hedging grades, is on the camellia collection page, with the wider palette in hedging plants, magnolias and flowering plants. Every order ships farm-direct with flat $99 delivery in QLD, NSW, VIC, SA, ACT and WA, a $399 minimum order, and the 30-Day Healthy Plant Guarantee.

Related ranges: Gardenias, Hydrangeas.