When I bought my current home about 33 years ago, I planted 6 black walnut trees. The state of Missouri Conservation Department sells packs of 6 starter saplings for about ten bucks. All 6 trees have grown well, and are about 15" in diameter after 33 years. My kids all live in other states; so when I pass the house will be sold. The next owner can decide on harvesting the walnut trees.