'Opal' Plum Tree (Prunus domestica) - Hardy Fruit Tree - 21 cm Pot - 90 cm Tall

The 'Opal' plum tree (Prunus domestica 'Opal') is known to be partially self-fertile, meaning it can produce fruit without an external pollinator. However, the presence of another plum tree nearby, flowering at the same time, significantly increases the fruit set rate and improves fruit size. If your garden is small or you only have space for a single tree, the 'Opal' plum tree remains an excellent choice for a decent harvest. Varieties such as 'Reine-Claude Verte' or 'Victoria' make good pollination partners.

The 'Opal' plum is a mid-season variety whose fruit reaches maturity between August and September, depending on weather conditions and exposure. This is one of its major advantages: it precedes several late varieties and offers sweet plums as early as late summer. 'Opal' plums are recognizable by their shiny red-purple skin and their melting yellow-orange flesh when fully ripe. To harvest at the right time, observe the color of the skin which must be uniformly dark and check that the flesh gives slightly under the finger.

Under favorable conditions, the 'Opal' plum tree (Prunus domestica 'Opal') can reach a height of 4 to 5 meters as an adult, with an upright to slightly spreading habit. Its growth is described as moderate, meaning it does not take over the garden too quickly and remains easily manageable by pruning. In a pot or patio planter, growth will naturally be limited by the volume of available growing medium.

Plant the 'Opal' plum tree preferably in autumn (October to November) to take advantage of natural rainfall and allow it to establish roots before winter, or in the spring outside of the frost period. Dig a hole two to three times wider than the root ball and slightly deeper. Place a layer of mature compost at the bottom and mix it with the excavated soil. Position the plant so that the graft union is level with the ground, without burying it. Water generously at planting, then mulch around the base to a depth of 8 to 10 cm with bark or straw to retain moisture and limit weeds.

Yes, the 'Opal' plum can certainly be grown in a large planter or patio pot, provided you choose a container of at least 60 litres to give it enough root space. Use a high-quality, well-draining potting mix made from a blend of multi-purpose compost and organic matter, and make sure the bottom of the pot has effective drainage holes. When grown in a pot, watering needs to be more regular and carefully monitored than when planted in the ground, especially during the fruit-swelling stage. Applying a fertiliser specially formulated for fruit trees in spring will encourage flowering and fruit production.

The 'Opal' plum tree has good overall resistance to diseases, but remains susceptible to some common Prunus problems. Brown rot (fruit rot) is the most common disease: it occurs in the event of excessive humidity at the time of ripening. Prune well to air out the tree and systematically collect mummified fruits. The black cherry aphid can colonize young shoots in spring; a treatment based on diluted black soap is generally enough to get rid of it.

'Opal' plums are remarkably versatile in the kitchen. Their sweet, juicy, and mildly tart flesh makes them excellent for eating fresh straight from the tree. In cooking, they lend themselves to many preparations: jams, compotes, tarts, clafoutis, crumbles, or even chutneys to accompany meats and cheeses. Their high natural sugar content allows you to reduce the amount of added sugar in jams and sweet preparations.