Peach

Light and exposure

A peach tree wants full sun and as much warmth as you can give it. In a cool climate, forget planting it out in the open exposed to every wind: give it the warmest corner of the garden, against a wall that catches the midday and afternoon sun, sheltered from the prevailing cold winds.

A sheltered spot does double duty: it stores up the day’s heat and gives it back at night, which brings blossom and fruit ripening forward, and it cuts the wind that dries out and weakens the tree. Avoid dips where cold air pools at the end of winter, those frost pockets that can scorch the blossom in a single night. In a hot climate the question reverses: sun is a given, it is the water at the base you have to watch.

Watering

A young, freshly planted peach needs regular watering in its first year, while its roots are still colonising the soil. Give it a good soak once a week when there is no rain, more during a heatwave, always at the base and never over the foliage.

Once established, a mature tree copes better with dry spells, but stays sensitive to a lack of water while the fruit is swelling, in the weeks leading up to harvest. Mulching the base holds moisture and avoids the feast-and-famine watering that makes fruit split. On the other hand, permanently waterlogged soil suffocates the roots and invites disease, a peach hates wet feet.

Soil and repotting

Peach trees like a light, well-drained soil, ideally neutral to slightly acidic. Soil that is too chalky or too heavy and clay-based suits them poorly, they sulk and turn yellow in it. If your ground is clay, plant on a small mound to raise the collar and help water drain away.

Enrich the planting hole with well-rotted compost, without overdoing the nitrogen, which pushes soft growth that is more prone to disease. Good drainage matters more than rich soil: a peach prefers average but healthy ground to a fat soil that holds winter wet.

Temperature and humidity

A peach tree copes with winter cold down to around minus twenty degrees without trouble once it is fully dormant, the hardiest varieties taking a few degrees more, which places it in USDA zones 5 to 9 depending on the variety. Winter itself is not the problem. Its real weak point is how early it flowers, at the tail end of winter, often before the last frosts have finished.

A frost of minus two or minus three degrees at blossom time is enough to wipe out the flowers and with them the whole year’s crop. That is the number one risk anywhere spring stays hesitant, and it is why choosing the right spot matters just as much as choosing the right variety.

Pruning and upkeep

A peach tree fruits on last year’s wood, unlike an apple tree which fruits on older branches. That means an annual prune, in late winter before the buds break, is essential to keep renewing these young fruit-bearing shoots and stop the tree from going bare lower down.

Also thin the fruit soon after set, once they are the size of a hazelnut, leaving only one every ten to fifteen centimetres along each branch. It looks harsh, but it is the price of a few plump, juicy peaches rather than a crowd of small, stunted ones that exhaust the tree.

Pests and diseases

Peach leaf curl, caused by the fungus Taphrina deformans, is enemy number one anywhere the end of winter is cool and wet. It is easy to spot: young leaves blister, pucker and turn red as they break bud, in cool damp weather. A weakened tree produces less and becomes more prone to other problems.

A preventive spray of Bordeaux mixture is still the best defence: one application when the leaves fall in autumn, and a second at bud swell right at the end of winter, before the flowers open. Sheltering the foliage from spring rain with a simple removable cover or awning helps a great deal, leaf curl spreads through water. In a climate that is dry at bud break, it almost stops being an issue. Also watch for brown rot, which rots fruit on the tree, powdery mildew in the hot dry season, and the green aphids that crimp and curl young leaves.

Propagation

Grafting is the method nurseries use, and the only one that guarantees a variety identical to the parent tree, usually grafted onto peach seedling rootstock or plum rootstock depending on the vigour wanted. It is a fiddly technique, hard to get right without experience, so it is usually worth buying a young grafted tree from a good nursery instead.

You can also sow a peach stone out of curiosity, the seedling germinates easily after a winter outdoors in the cold, but it will not necessarily give fruit identical to the parent and will take several years before it fruits at all. Fun to try, but do not count on it for real, reliable production.

Month-by-month care calendar

Green Hub tips

• Spray with Bordeaux mixture twice a year without fail, once when the leaves fall in autumn and once at bud swell in late winter: that is what makes the difference against leaf curl, the real scourge of peach trees wherever the end of winter is cool and wet.
• Train your peach against a wall that catches the midday and afternoon sun if you can, the stored warmth protects the blossom from frost and clearly brings the fruit’s ripening forward.
• Do not be afraid to thin the young fruit hard soon after set, one every ten to fifteen centimetres: that is what gives you a few plump, juicy peaches rather than a crowd of small ones.
• Where springs are cold and summers grey, choose a variety known to be hardy and open-grown rather than a southern one, it will cope far better.