The sour cherry is a classic, reliable fruit tree of Polish gardens and orchards. It is frost-hardy and many varieties are self-fertile, so they crop without the need for a pollinator. Below is a practical guide from the Drzewka Kusek nursery.

  • Łutówka (Graniasta) – a classic, tart and productive variety; excellent for preserves, partly self-fertile.
  • Kelleris – frost-hardy, self-fertile and productive; tasty, dark fruit.
  • Nefris – self-fertile and productive; dark fruit good for juice and preserves.
  • Debreceni (Debreczyńska) – sweet-and-sour, productive, with dessert qualities.
  • Ujfehertoi Fürtös – Hungarian, self-fertile, with dark, sizeable fruit.

Sour cherry seedlings – rootstocks and pollination

Many sour cherry varieties are self-fertile (e.g. Łutówka, Kelleris, Nefris) – they crop without pollinators, although a neighbouring variety usually improves the yield. The choice of rootstock determines vigour:

  • Mahaleb cherry – vigorous growth and a deep root system; tolerates drier, lighter soils.
  • Wild (bird) cherry seedling – vigorous growth, giving sizeable trees.
  • Dwarfing rootstocks (Gisela type) – weaker growth and earlier cropping; for smaller gardens.

Fertilising sour cherries – what is worth knowing?

  • In spring – nitrogen fertilisers supporting growth and fruit set.
  • In summer and autumn – potassium and phosphorus improving fruit flavour and the tree’s health.
  • It is worth using compost or manure and keeping the soil slightly acidic.

Pruning sour cherries – how and when?

Sour cherries fruit on spurs and one-year-old shoots. Neglected, they tend to go bare along long shoots, so pruning should stimulate young growth:

  • Thinning cuts – best after harvest or in early spring; remove crowding and old, exhausted shoots.
  • Regular, moderate shortening prompts the tree to put out new, fruit-bearing growth.
  • A thinned canopy is better ventilated, which limits fungal diseases.

Sour cherry diseases and how to prevent them

  • Cherry leaf spot (Blumeriella) – causes premature leaf fall; raking up and removing infected leaves plus protection are key.
  • Brown rot – rotting fruit and wilting shoots; remove mummified fruit.
  • Bacterial canker – gum oozing and dieback of shoots; prune on dry days and protect the wounds.

Pests

  • Cherry fruit fly – its larvae cause maggoty fruit; timely control is important.
  • Cherry (black) aphid – curls and blackens young leaves and shoot tips.
  • Spider mites – cause silvering and drying of leaves.

Monitoring, traps and supporting natural enemies of the pests all help.

Sour cherry seedlings – care calendar

  • Spring: nitrogen feeding, protection against leaf spot and aphids.
  • Summer: pruning after harvest, protection against the cherry fruit fly, watering in drought.
  • Autumn: raking leaves (reduces leaf spot), potassium-phosphorus feeding.
  • Winter: thinning cuts, whitewashing trunks, checking tree condition.