When to Prune a Camellia Without Losing Next Year's Flowers

The window opens as flowering ends and shuts by midsummer

A camellia flowers on wood made the previous year. It puts on its growth flush as soon as flowering finishes, that growth hardens over a few weeks, and then the flower buds for the following year form on it in early to midsummer. Everything about pruning follows from that sequence.

Prune as soon as the last flowers drop. This gives the plant the whole growth flush to replace what you took and still leaves time to set buds on the new wood before summer ends. A shrub pruned at this moment barely misses a season.

Prune in late summer or autumn and you are cutting off buds that have already formed, whether or not you can see them yet. Prune in winter and you are cutting off buds you can clearly see, which at least has the merit of being obvious. Either way the following spring is thin, and the plant takes two years to catch up.

This is the whole of camellia pruning discipline. Most camellias need no regular pruning at all: they make a good natural shape, and the plants that flower best are often the ones nobody touches. Cut when you have a reason, in the window, and leave the shrub alone the rest of the time.

What to cut, and where the cut goes

Start with the three cuts nobody regrets: dead wood, damaged wood, and branches crossing and rubbing through each other's bark. Take those out at any time of year, because leaving them does more harm than the pruning does. Everything beyond that is shaping, and shaping belongs in the window.

Cut back to a leaf joint or to a side branch, never leaving a bare stub. Camellias regrow from dormant buds in the leaf axils, so a cut just above a leaf produces a shoot that grows in a sensible direction. A stub between joints dies back and becomes an entry point for disease.

Thin rather than shear. A camellia that has become a dense dome of foliage flowers only on its outer skin, and rain sits in the middle of it, which encourages the flower diseases. Removing whole branches from inside the plant to open it up does far more than trimming the outside, and it does not leave the plant looking cut about.

1. Take out dead and crossing wood first Remove anything dead, broken or rubbing, cutting back to healthy wood or to the branch it grows from. Do this before shaping so you can see the real structure of the plant.
2. Open the center Remove two or three whole branches from inside the shrub, cutting them at their point of origin. Light and air in the middle mean flowers on the inside of the plant and less flower rot.
3. Shorten what is out of place Cut over-long or awkward shoots back to a leaf joint facing the direction you want the new shoot to grow. Take no more than about a third of the plant in one season.
4. Step back and stop Walk around the plant before making any further cuts. Camellias look best with an irregular natural outline, and the commonest error is carrying on until the shrub is a ball.
5. Water and mulch afterwards Pruning is followed immediately by a growth flush, which needs water. Soak the root zone and renew the mulch so the replacement growth is strong enough to carry buds.

Renovating an old overgrown camellia

Camellias tolerate hard pruning better than almost any other flowering evergreen. An old shrub that is bare at the base, too tall, or has swallowed a path can be cut back into thick old wood and will sprout again from dormant buds under the bark. Plants cut back to two or three feet (60 to 90 cm) commonly recover fully.

Do it in the window, immediately after flowering, so the plant has a full season to respond. Cutting hard in autumn leaves large wounds and no growth to heal them, and the shrub sits open to cold all winter.

Expect no flowers for two years afterwards, and a mass of shoots in the first summer that will need thinning the following year. Spread the work over two or three seasons if you cannot accept a gap: take out a third of the oldest stems at ground level each year and let replacements come through, and the shrub is never bare.

Feed and water a renovated plant properly, because it is regrowing a whole canopy from stored reserves. This is the one case where a camellia genuinely needs the attention: a hard-pruned shrub left dry through the following summer often fails to come back.

Before cutting into thick old wood, check the base of the plant for growth coming from below a graft union. Some camellias are grafted, and shoots arising from below that swollen joint belong to the rootstock. Remove those flush with the stem rather than encouraging them.

Deadheading, hedges and what to write down

Camellias do not need deadheading to flower well next year, but picking off spent flowers is worth doing anyway for a different reason: fallen brown flowers on the ground under the plant are where petal blight overwinters. Clearing them is a disease measure rather than a tidiness one, and it belongs with your general care rather than with pruning.

Camellias make good informal hedges and take clipping, but a hedge trimmed in late summer, as hedges usually are, will hardly flower. Clip a camellia hedge in the same window as you would prune a shrub, right after flowering, and accept a slightly looser outline for the rest of the year in exchange for a display.

Keep a note of the date you pruned, how hard, and what the plant did the following spring. Camellias respond slowly enough that one year's observation proves nothing, but three years of dates against three years of flowering makes the pattern obvious, and it will usually show that the good years followed the early cuts.