I've been harvesting chestnuts for a few decades and every year I plant 50 of the largest nuts. Since they don't stay viable very long, I intersperse them among garlic as I pant those cloves in October since rodents tend not to mess with them. Typically only six to ten chestnuts sprout the following spring and make it into July at when I move them into hedgerows. Some of the trees are now more than 10 years old and produce a few pounds of these wonderful nuts: more each year. Each tiny tree needs its own circle of fence to keep deer from browsing leaves and twigs and rodents from nibbling bark off the trunk. This fencing can be dedicated to new trees once the trunk is about four inches in diameter (and the lower branches are above deer height}.