Position a garden hose, starting at a corner or end of a split rail fence. The garden hose will naturally create organic curves, which usually look the best with this type of fence. At a corner or end the landscape bed will tend to have a roughly triangular kidney shape. When possible the bed should be large enough to host an ornamental tree, decorative support shrubs and lower perennial flowers or edging plants. By layering a bed from tall (trees) near the back and shorter shrubs and plants toward the front, the resulting bed will produce a lush look.
Measure the height of the bottom rail of the fence. If your lawn mower will not be able to mow under the fence from the back side, then it is important to extend the landscape bed to or beyond the posts so that maintenance is not difficult. If the lawn mower will fit under the rail, then the back of the landscape bed can have grass under the fence area. This can provide a nice visual appearance when the bed is mulched, but it will require additional upkeep.
Mark your corner (establishing or largest) bed using yard paint. This will indicate your dig lines. Consider adding soil to your largest bed to mound the bed six inches to a foot above existing grade. This will give the bed additional impact.
Move the hose along the split rail run and again allow the beds along the fence to have curves and movement. This type of organic border encourages the eye to move along the bed. If your landscape style is casual or cottage, you may elect to plant foundation shrubs at the back or along the fence line with flowering and bedding plants in front. For a more formal look, plant many similar shrubs in hedge-type rows or large groupings.
Establish landscape beds that are deeply mulched to prevent weeds along split rail fences that form a zig-zag shape. This fence style naturally creates planting opportunities where taller ornamental trees can be centered and surrounded by repeating clusters of similar plants. By landscaping on the public side of the fence that may be adjacent to a road or driveway, the fence adds enormous visual interest and curb appeal to the property. By juxtaposing the home side of the fence with grass or a ground cover, the landscaping will become a focal point.