Q. I have two cherry trees and one needs to pollinate the other. Can I plant both trees in the same hole so save space?  The trees grow to 20 feet and I will keep them pruned to a smaller size. Sweet cherries produced at the Orchard. Production is erratic in the Las Vegas Valley.   A. Yes, you can. Plant them about 18 inches apart, one on the east side and one on the west side of the hole. Try to pick varieties that are similar in vigor (how strong they grow) and on the same variety of rootstock. Multiple apple trees planted in a single hole at Dave Wilson Nursery             I will warn you that sweet cherries are squirrely in our hot desert environment. They produce cherries in some microenvironments and not in others. They usually seem to do better in backyards that are somewhat protected (no strong winds) and have a more humid environment during pollination.             If you plant these two trees together, keep them occupying only half of the canopy. Do not let them compete with each other but keep them occupy their own, separate spaces. This means there will be a clear physical separation between the plants in their own half circle of canopy space. Also, do not let one get bigger than the other. Keep them pruned to a similar size.             These cherries must also bloom at the same time if they are to pollinate one another. Check your pollination charts to make sure they are compatible.