A well-kept line of trees down a fence line may enhance an area and make more interest than the simple straight lines of rails or forks, which is why lots of people plant trees close fencing. However, your trees are not considerate plants, and in case you’re not careful, they will damage the fence by changing posts out of alignment with their root systems.
Research the sort of tree you want to plant to discover the spread of the main system. Tree roots grow down and out equal to the spread of their limbs, but then send smaller roots up to the surface even farther out than that. These smaller roots are not as much of a worry, so concentrate on finding what the spread of the limbs are in adulthood. This drip line is how far away your tree should be from the fence posts.
Find an area with well-draining dirt at a distance from the fence equal to the drip line.
Assess the main ball of the tree and then dig a hole for the roots that’s twice the size. The depth of the hole should be equal to the height of the root ball.
Place the tree in the hole. Add or take away dirt below the main system to correct the height of their roots so the top of the root ball is just above ground level.
Mix organic substance with the dirt removed from the hole. Matters such as shreaded mulch or peat moss are good additions. This enhances drainage marginally, but more important, adds nutrients to the soil.
Water the trees you plant to soften the dirt to the touch. Do not water so much that pressing on the dirt creates small pools of water. Add water each day to supplement rain water. Preserve moisture to a depth of 1 foot.