As you replace the soil, break up heavy clods and remove stones and debris. Do not fertilize the plants now. Wait until they are established. Apply three to five inches of mulch around the plants. This final step is very important to help conserve moisture, moderate soil temperature, and prevent weeds which compete with the plants for nutrients and moisture.
Organic mulches including pine straw or bark are excellent mulches.
Wood shavings, chips or sawdust can be used but will result in loss of nitrogen. Fall leaves are also a good mulch.