Grape

Petite Pearl

Petite Pearl is a red grape bred by Tom Plocher in Minnesota. Its appeal to northern growers combines later spring budbreak with deeply coloured fruit and useful tannin. It belongs to the wider development of wines adapted to continental winters, alongside Marquette and Frontenac.

Breeding and seasonal fit

Plocher records it as a seedling from a 1996 crossing of MN 1094 and E.S. 4-7-26.11. Plocher Vines, “Petite Pearl Grape,” breeder's pedigree and field account. His vineyard observations describe moderate, drooping growth and an ability to retain dormancy during late-winter warm spells. Later budbreak can reduce exposure to some spring freezes, though it cannot guarantee that a crop will escape frost.

The breeder also records winter injury at colder sites in severe years. A variety's suitability depends on the local sequence of warmth and cold as well as the minimum temperature. Sufficient summer heat remains necessary to ripen the crop.

Tannin and disease pressure

The University of Minnesota's 2023 introduction to its fact sheet reports widespread adoption by Minnesota growers and highlights higher tannin than in several other cold-hardy reds. That makes tannin management a meaningful part of the cellar work, alongside colour extraction and acid balance.

Plocher describes useful resistance to both mildews, but identifies black rot as a concern in more humid regions. The combination of winter and disease traits must therefore be evaluated locally rather than treated as a promise of unattended cultivation.

Sources

• Plocher Vines, “Petite Pearl Grape”, breeder's account, accessed 22 September 2026.
• University of Minnesota, “Petite Pearl fact sheet now available”, 20 March 2023.