Original sentence: a promise in the dark
Edited sentence: Although so-called "seedless" watermelons have far fewer seeds than the seeded varieties, they generally contain at least a few soft, pale seeds.Because seedless hybrids have sterile pollen, pollinizer rows of varieties with viable pollen must also be planted.For commercial plantings, one beehive per acre (over 9,000 m² per hive) is the minimum recommendation by the US Department of Agriculture for pollination of conventional, seeded varieties.For this reason, commercially available seedless watermelon seeds actually contain two varieties of seeds; that of the triploid seedless plant itself (recognizable because the seed is larger), and the diploid plant which is needed to pollenize the triploid.Since the supply of viable pollen is reduced and pollination is much more critical in producing the seedless variety, the recommended number of hives per acre, or pollinator density, increases to three hives per acre (1,300 m² per hive).The resulting triploid plant is sterile, but will produce the seedless fruit if pollenized by a diploid plant.They are the product of crossing a female tetraploid plant (itself the product of genetic manipulation, using colchicine) with diploid pollen.Unless both plant types are grown in the same vicinity, no seedless fruit will result