Select a planting site that has well-draining soil that does not collect standing water. The site should get partial to full sun - between four and eight hours daily. Miniature boxwoods thrive in soil with a pH of between 5.5 and 7.5, which is mildly acidic to mildly alkaline.
Dig a hole in the planting site that is twice the width of the nursery container and just as deep. Do this in spring, after the last frost has passed. Space the boxwoods two feet apart.
Remove the boxwood from the nursery container. Lower the plant into the hole, spreading its roots out over the soil. Fill the hole with topsoil until the boxwood is at the same depth it was in the container.
Firm the soil with your hands to remove air pockets. Water until the soil settles completely. Maintain a watering schedule of one inch of water per week, unless you get the same amount of rain.
Cover the soil around the miniature boxwood with a 2- to 3-inch layer of organic mulch such as pine needles or wood chips. Replenish the mulch layer annually as it decomposes into the soil.
Apply an all-purpose fertilizer once a year, starting the second growing season. Keep fertilizer at least six inches from the trunk.
Shear away new flushes of growth during the first two years of the plant's life in your garden. Afterward, prune away dead or diseased branches, or overgrown branches.