Ginkgo biloba ‘Grindstone’ Syn. Ginkgo biloba Grindstone Lake’, ‘Sky Tower’ and ‘Fly Fastigiate’ .
 
Ginkgo biloba ‘Grindstone’  was found as a sport on a Ginkgo at a roadside rest stop on the shores of Grindstone Lake, Sothern Ohio, in the United Sates of America’. It has been described as “the jack-in-the-beanstalk-like Ginkgo”.
 
In the national collection to futher complicate matters, we have:
 
Ginkgo biloba ' Grindstone Lodge'
Ginkgo biloba 'Grindstone Lake II'
Ginkgo biloba 'Grindstone 3'
 
At a young age all of the above appear to be fairly similar. Only time will tell if they dearve to be cultivars in thier own right.
 
Gary Handy of Handy’s Nurseries reports ‘that the plant patented under the name Ginkgo biloba ‘Sky Tower’, was found at a truck stop in southern OH (before the patent) and is also synonymous with Ginkgo biloba ‘Grindstone’, Ginkgo biloba Grindstone Lake and Ginkgo biloba Fly Fastigiate’.
 
Description - Ginkgo biloba 'Grindstone’ is believed to be male. The foliage is typical of the species. The branches arise at acute angles to the main stem. It is an enormously slender, columnar growing tree. The growth rate averages 20cm a year. In ten years, a young tree should be at least 2m high with a spread of 0.5m. It is expected to make a tree that reaches a height of approximately 10 m with a width of 1.5 m. Whist not grown for autumn colour, it puts on a respectable show. In winter it is said to take on the silhouette of a Lombardy Popular.