Synonym or cultivar number (also ES 4-7-25) for the grape variety Pionnier; see there.
The red grape variety is a complex interspecific new breeding between Elmer Swenson 2-12-27 (Elmer Swenson 5-14 x Swenson Red) x St. Croix. Synonyms are ES 4-7-25 and Elmer Swenson 4-7-25....
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Roman Horvath MW
Domäne Wachau (Wachau)