Volgens de engelstalige wikipedia groeit de persimoen in rijke grond. "but will grow in rich, southern, bottom lands. It can be grown in northern Ohio only with the greatest of care, and in southern Ohio its fruit is never edible until after frost.[4]" Een stukje van een engelstalige site over de persimoen: "Adaptation Common persimmon grows over a wide range of conditions from dry, sterile, sandy woodlands to river bottoms to rocky hillsides. Growth is best on terraces of large streams and river bottoms with clays and heavy loams; usual sites in the Mississippi Delta are wet flats, shallow sloughs, and swamp margins. It thrives in full sun but also is shade-tolerant and can persist in the understory. It is an early pioneer on abandoned and denuded cropland and is common on roadsides and fencerows. Common persimmon often is seen as thickets (derived from root suckers) in open fields and pastures. This species flowers in March- June and fruits in September-November." https://plants.usda.gov/plantguide/pdf/pg_divi5.pdf @weknow. Het ligt er dus denk ik wel aan op wat voor een grond je zit. Volgens mij zijn persimoenen inderdaad niet zo moeilijke n.a.v deze bronnen.