Ribes nidigrolaria
| Jostaberry (Ribes nidigrolaria) | |
|---|---|
| Scientific name | Ribes nidigrolaria [1] |
| Common names | Jostaberry |
| Genus | Ribes |
| Family | Grossulariaceae |
| Order | Saxifragales |
| Growth form | Thornless fruiting shrub with vigorous canes [2][3] |
| Climate and site | Cool-temperate currant and gooseberry conditions; full sun or partial shade and fertile, well-drained soil [3][4] |
| Fruit | Nearly black to reddish-black berries, about gooseberry-sized, edible raw or cooked [2][3] |
| Harvest | Pick when fully colored and soft; preserve use is documented [3] |
Jostaberry (Ribes nidigrolaria) is a thornless cultivated hybrid in the currant-and-gooseberry group. Its documented pedigree combines black-currant and gooseberry lineages, with one account also identifying coastal black gooseberry in the complex cross. [2] The accepted taxon is retained under Ribes nidigrolaria; the hybrid multiplication sign and author names belong to the internal nomenclatural record rather than this public title. [1]
Description[edit | edit source]
Jostaberry forms vigorous, thornless canes and bears berries that are nearly black to reddish-black. Extension descriptions place the fruit near gooseberry size; the berries can be eaten raw or cooked and are used for preserves. [2][3] A sensory and volatile study examined ripe and underripe fruit from Southern Germany across locations and years, identifying ripening-related changes in volatile compounds and key aroma compounds through sensory analysis. [7]
As a cultivated hybrid, jostaberry does not have one wild native range or a single native wet/dry seasonal rhythm. Its practical seasonal pattern is instead the cool-season currant-and-gooseberry pattern used in temperate gardens: establish plants in early spring, prune during late winter, and harvest when the berries have reached full color and softened. [3]
Cultivation[edit | edit source]
Jostaberry is suited to the cool-temperate conditions used for currants and gooseberries. Give it a site with dependable moisture during active growth, but keep the root zone well drained. Extension guidance describes the plant as suitable for full sun or partial shade, with fertile loamy soil and good drainage. [3][4]
Soil and water[edit | edit source]
Use fertile, well-drained loamy soil. Colorado guidance gives a soil reaction around pH 6–7 for jostaberry and recommends avoiding poorly drained ground; this is a practical cultivation range rather than a universal limit for every soil or climate. [3] Group-level currant and gooseberry guidance likewise emphasizes rich, well-drained soil and regular garden care. [4]
Sun and humidity[edit | edit source]
Full sun or partial shade are both described as suitable exposures. A sunny position should support fruiting, while partial shade can be useful where summer heat is strong; avoid placing the shrub where poor airflow keeps foliage wet for long periods. [3][4]
Seasonal changes[edit | edit source]
Plant in early spring where that is the local planting window. Prune in late winter, removing wood more than three years old so the shrub carries a renewing framework of younger canes. [3] Harvest timing is tied to ripeness rather than a fixed calendar: pick berries when fully colored and soft. [3]
Propagation[edit | edit source]
The breeding record documents hybrid progeny, open-pollinated seedlings, and fertile later-generation hybrids, but it does not establish a home-garden propagation protocol for jostaberry. [5] Treat general currant-and-gooseberry propagation instructions as group guidance rather than as a measured R. nidigrolaria method, and keep named selections tied to correctly identified source material. The breeding program's practical focus was selection of named genotypes, including Josta, rather than a single universal propagation recipe. [5][6]
Flowering, fruiting, and harvest[edit | edit source]
Colorado State University Extension recommends growing black and red jostaberries together where the goal is best fruit set. This is an extension recommendation, not a universal pollination guarantee for every planting. [3] In the breeding work, selfings were described as having low fertility, while fertile F2 hybrids were obtained in later generations; those results are breeding-program observations and should not be converted into a fixed home-orchard pollination rule. [5]
The breeding literature describes variation among genotypes in fruit characteristics and ripening, and later selection work targeted resistance, yield, fruit quality, and suitability for mechanical harvesting. [5][6] For garden harvest, pick when the berries are fully colored and soft. The crop can be labor-intensive to harvest, and bird protection may be needed. [2][3]
Fruit and uses[edit | edit source]
The berries range from nearly black to reddish-black and are described as roughly gooseberry-sized. They are eaten raw or cooked and are suitable for preserves; Colorado guidance also describes good shelf life. [2][3] Flavor varies among hybrid material, with black-currant character noted in extension descriptions rather than as a fixed profile for every selection. [4] The published sensory study supports studying aroma across ripeness stages, but its accessible summary does not justify a universal numerical flavor or aroma rating. [7]
Pests and disease[edit | edit source]
The jostaberry account in the Washington State University publication describes resistance to powdery mildew and white pine blister rust. It also notes that birds may require exclusion or protection around the crop. [2] These are source-scoped horticultural characterizations, not a guarantee that every selection will remain disease-free under every local pressure.
Cultivars and selections[edit | edit source]
Josta was introduced as the first jostaberry cultivar in 1977. The breeding record also describes variation in fruit and ripening and later selection for resistance, yield, quality, and mechanical harvest. [5][6]
The Washington State University account lists Variegated (European), Adams, Johns, Nova, Haschberg, Alesso, Korsor, and Black Beauty among jostaberry cultivars or selections. That list is useful for searching nursery and breeding records, but it does not supply reliable side-by-side data on fruit quality, harvest timing, climate adaptation, propagation, or current availability for each name. [2] Do not treat a listed name as a performance guarantee without selection-specific information.
References[edit | edit source]
- ↑ [1] GBIF species match: Ribes nidigrolaria. Accepted exact match and current taxonomic backbone record. Accessed 2026-09-29.
- ↑ [2] Washington State University Extension, Minor and Uncommon Fruits for Maritime Climate Gardens. Jostaberry hybrid description, fruit, disease characterization, harvest, and named selections. Accessed 2026-09-29.
- ↑ [3] Colorado State University Extension, Currants, Gooseberries, and Jostaberries. Jostaberry fruit, site, soil, pruning, fruit-set, harvest, shelf-life, and preserve guidance. Accessed 2026-09-29.
- ↑ [4] University of Minnesota Extension, Growing currants and gooseberries in the home garden. Jostaberry description and group-level exposure, soil, spacing, pruning, hardiness, and flavor guidance. Accessed 2026-09-29.
- ↑ [5] A. Bauer, New results of breeding Ribes nidigrolaria: amphidiploid species hybrids between blackcurrant and gooseberry, Acta Horticulturae 183 (1986), pp. 107–110. Breeding crosses, fertility, progeny, fruit variation, and the 1977 introduction of Josta; publisher abstract. Accessed 2026-09-29.
- ↑ [6] A. Bauer, H. Haberli, and H. Schimmelpfeng, Progress in breeding Ribes x nidigrolaria jostaberries adapted to mechanical harvesting, Acta Horticulturae 538 (2000), pp. 473–474. Breeding selection for resistance, yield, quality, and mechanical harvesting. Accessed 2026-09-29.
- ↑ [7] Analysis and Sensory Evaluation of Jostaberry (Ribes x nidigrolaria Bauer) Volatiles, Journal of Agricultural and Food Chemistry 61(38) (2013). Original volatile and sensory study of ripe and underripe fruit from Southern Germany. Accessed 2026-09-29.