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Opal

  • Picking season: Early
  • Country of origin: Sweden
  • Self-fertility: Self-fertile
  • Flowering group: 3

Opal is probably the best-flavored early plum variety - indeed it is sometimes called a gage-like plum thanks to the excellence of its flavor. However the flavor depends crucially on developing sugars during the short growing period, and in northern gardens Opal really benefits from being grown in a sunny aspect. In less favourable situations it will still give good crops but with a less intense flavor.

The fruit is medium-sized, colored dusky red with a heavy bloom, becoming blue when overripe. The plums ripen over a period of about 1-2 weeks, so you don't have to deal with a glut. The flesh is straw-yellow and fairly juicy. Opal is a free-stone plum - the stone falls away easily from the flesh. If picked on a warm July day and placed in a fruit bowl Opal also has a wonderful aroma.

Please note we cannot deliver Opal plum trees to California.

Prunus domestica

Opal plum trees for sale

  • 11-year maiden bare-root tree 25.00
    Wavit rootstock
    Large size (3m-4m after 10 years)
  • 21-year maiden bare-root tree 24.45
    St. Julien rootstock
    Large size (3m-4m after 10 years)
  • 31-year maiden bare-root tree 25.00
    Brompton rootstock
    Full size size (4.5m-6m after 10 years)
Next deliveries

Deliveries resume December 2020


How to grow

Opal is very easy to grow, and crops reliably. It has the potential to produce a heavy crop, and in a good spring it is likely that too much of the blossom will set fruit. This will lead to a very large crop of very small plums which will lack flavor. If this seems to be happening, thin the fruitlets towards the end of May so that there is one plum per cluster, with about 2" / 5cm or so between each plum. Thinning plums is a tedious business, but you won't regret it as the ones left will be bigger and with better flavor.

Opal is very hardy and a good choice for colder climate zones.

History

Opal was developed in Sweden in 1925 from a cross between Oullins Gage and Early Favourite.

Opal characteristics

  • Picking seasonEarly
  • CroppingHeavy
  • Keeping1-3 days
  • Fruit persistenceRipens over a period
  • Useful forEating fresh
  • Gardening skillBeginner
  • Self-fertilitySelf-fertile
  • Flowering group3
  • Pollinating othersAverage
  • VigourSlightly large
  • Bearing regularityRegular
  • Disease resistanceGood
  • Climate typeTemperate climates
  • Summer average maximum temperaturesCool ( 20-24C / 68-75F)Warm (25-30C / 76-85F)Cold (< 20C / 67F)
  • Country of originSweden
  • Period of origin1900 - 1949
  • Flower colourWhite
  • Fruit colourRed
  • AwardsRHS Award of Garden Merit