Opal is probably the best-flavoured early plum variety - indeed it is sometimes called a gage-like plum thanks to the excellence of its flavour. However the flavour depends crucially on developing sugars during the short growing period, and in the UK and northern Europe Opal really benefits from being grown against a south-facing wall or in a sunny aspect. In less favourable situations it will still give good crops but with a less intense flavour.
The fruit is medium-sized, coloured 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.
We recommend Opal because it is easy to grow in a variety of climates and provides good quality plums early in the season.
**All prices include delivery (except certain fan-trained or espalier-trained trees). We offer a discount on orders of multiple bare-root trees for delivery at the same time - this will be shown at the checkout.
Fan-trained and Espalier trees: Prices of these trees do NOT include delivery as these require special delivery arrangements - click here for details.
Delivery period: Pot-grown trees can be delivered from September onwards. Bare-root trees can be delivered from mid-November onwards. Within those periods you can specify your preferred month of delivery during the checkout process. It is best to order as soon as you can to ensure items are reserved for you.
*Mature heights: Height shown is the approximate height of the tree when mature (after 5-10 years), not the height when supplied. See photos of trees as supplied. Actual mature heights may vary considerably dependent on your local conditions and training and pruning regime.
Stock availability: Items showing as 'sold out' will probably be available again next season. If you would like to reserve in advance use our enquiry form - this does not commit you to anything.
Opal is self-fertile and does not need a pollination partner, although fruiting may be improved if there is a compatible tree of a different variety nearby. Since it flowers in the middle of the blossom season it can be pollinated by most other plum trees.
Our online pollination checker lists suitable pollination partners for this variety.
More advice about pollination.
Opal is very easy to grow, and crops reliably, so it is a good choice for almost any situation. However to really develop its flavour potential there are two simple things to consider. Firstly, it re-pays planting in a good sunny aspect. Growing as a fan along a south-facing wall will get the best results.
Secondly, Opal 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 flavour. 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 flavour.
Planting instructions.
Pruning instructions.
Developed in Sweden in 1925 from a cross between Oullins Gage and Early Favourite.
