🫐 Josta Jostaberry

What it looks like

Why this variety

Josta is the original jostaberry — the first cultivar released to the public, in 1977, from a German breeding program that crossed blackcurrant, European gooseberry, and North American coastal gooseberry into one thornless, vigorous, disease-resistant bush. Its berries are medium-sized, deep purple to black, sweet-tart with a flavor somewhere between a currant and a gooseberry, and the bush is self-fertile, which means one plant fruits alone — though planting a second cultivar nearby improves the crop. Josta is also nearly thornless, a genuine blessing after gooseberries, and it resists the mildew and blister rust that plague its parents, which is why it became the standard jostaberry against which later ones are judged.

The trade-off is chill and naming confusion. Josta needs winter cold to fruit well, which limits it to a North Florida trial, and the name Josta has been used loosely in the trade for any jostaberry, so a plant labeled Josta may or may not be the original cultivar — buy from a nursery that specifies Ribes x nidigrolaria ‘Josta’ and expect some variation. It also grows big — five to six feet tall and wide — so give it room, prune out old wood each winter, and net bushes as berries color, because birds find jostaberries before gardeners do.

If you are new to choosing between cultivars, the Varieties Matter guide explains why the name after the plant matters as much as the plant itself. Josta is a perfect example: it is not just a jostaberry in the abstract, it is a jostaberry with a specific job, a specific history, and specific strengths.

Florida honesty: jostaberry is a North Florida trial, not a statewide berry. It needs winter chill that Central and South Florida do not deliver, and even in the Panhandle a warm winter can mean a thin crop, while summer humidity tests a plant bred for northern Europe. Plant Josta in the coldest part of a North Florida yard, in sun with afternoon shade, rich moist soil, and mulch to keep roots cool, and treat a full berry year as a win. South of North Florida, plant blueberries and muscadines, which are made for Florida.

How to grow

Plant dormant bare-root bushes in late winter in full sun to part shade and rich, moist soil — jostaberries want morning sun, afternoon shade in hot climates, and mulch to hold moisture, because their roots are shallow. Work worm castings and compost into the planting hole, water consistently through the fruiting season, and prune each winter to keep the center open: remove old, unproductive wood and any crossing branches. Plant two different cultivars for the best pollination, especially with Jogranda, and net bushes as fruit colors, because birds find jostaberries first.

Set plants 5-6 feet apart in soil with a pH around 6.0-7.5. Work worm castings into the bed at planting and mulch to hold moisture. A well-fed jostaberry plant rewards that care directly: steadier growth, better bloom, and a show that actually shows up.

Water & feeding

Keep soil evenly moist but never waterlogged — jostaberries have shallow roots that hate drying out, and a bush that dries out drops fruit and wilts dramatically. Water at the soil line, mulch deeply to hold moisture and keep roots cool, and feed moderately: castings and compost at planting plus a balanced organic feed in spring. In a dry spell, water deeply and regularly, because fruit size depends on steady moisture; in a wet season, drainage and air circulation matter most, because mildew loves a crowded, damp bush.

Common problems

• Failure to fruit without winter chill — a warm winter means few berries; in Florida this limits jostaberries to a North Florida trial.
• No fruit without a pollination partner (Jogranda) — plant with another cultivar like Josta, or accept a lighter crop.
• Birds stripping berries — net bushes as fruit colors, because birds find ripe jostaberries before gardeners do.
• Powdery mildew in humid air — space for air, water at the soil line, and prune for circulation; jostaberries resist better than their parents but are not immune.
• Name confusion in the trade — Josta, Jogranda, and Jostaki tags are muddled; buy by berries and habit, not just the tag.

Harvest

Pick berries in midsummer to late summer, when they are fully dark purple-black and slightly soft — jostaberries are sweetest when they give slightly under the thumb, and they ripen unevenly, so pick over several days. Net bushes as fruit colors, because birds find ripe jostaberries first, and pick into a shallow container to avoid crushing. Eat fresh, or cook into pies, jams, and sauces the same day, because jostaberries keep only a few days fresh. Freeze surplus berries on trays before bagging, and prune out old wood each winter so next year’s crop has light and air.

Saving seeds

Josta is the original jostaberry, the first cultivar released to the public, in 1977, from a German breeding program that crossed blackcurrant, European gooseberry, and North American coastal gooseberry into one thornless, vigorous, disease-resistant bush, and it is planted as a bare-root bush — plant dormant bare-root bushes in late winter, and plant two different cultivars for the best pollination. The Propagation section of the Jostaberry guide covers propagation for the species.