Step 1: After determining how big you want your raised bed, measure and mark the outline on the ground. (The interior dimensions of this bed are 4’7” x 10’5”.) To be sure the corners are right angles, measure space between the parallel sides at a few different spots.
Step 2:Lay cinderblocks along marked line for side #1, paying attention that each block is level and in a straight line. If you’re going uphill you will have to dig into the hill; if you’re going downhill you’ll have to add dirt. In this picture we’re going downhill; see step 4 for an example of going uphill.
Step 3:Lay cinderblocks for side #2 (level each block and check that they’re straight). If you’re going downhill, like in this picture, you’ll eventually want to add a second layer of cinderblocks instead of adding dirt to make the blocks level. You may have to dig a trench to lay the bottom layer of blocks.
Step 4:Lay the cinderblocks for side #3, checking that each is level. Measure distance between sides #1 & #3 at each block to ensure straight sides. In this photo we’ve laid the 2 layers of cinderblocks for side #3 and are beginning on side #4. Note the trench we’ve dug, as this side is lower than side #2.
Step 5:Lay the cinderblocks for side #4, checking that each is level. Measure distance between sides #2 & #4 at each block to ensure straight sides.
Step 6:Mound dirt on the outside of the cinderblocks to keep them in place.
Step 7:Add top soil, compost, sand or peat moss and lime, if needed. Till or hoe the soil to mix and rake it level. Your raised bed is now ready for planting.