We ate two small Ancient watermelons, today. One had red seeds as usual (maybe even brighter red than last year). The other was a cross and had dark seeds. They both tasted awesome, but different.
Last year, I grew two spots with it (perhaps three plants per spot). It got bigger fruit last year. It had a good taste, but not as flavorful as the two I described above. One of the plants had white flesh, and so must have been a cross. I saved seeds from the red-fleshed one. The true fruit had a pear-type shape and a bubbly pattern on its rind.
In 2017, I also grew Ancient, but I didn't track down which fruits I harvested were Ancient.
Ancient has a tender, almost pear-tasting rind. The rind isn't sweet, particularly, though.
Location: SW Idaho, USA
USDA hardiness zone: 6
Elevation: 2,260 feet Profile post