Plant Green Mountain Boxwood in well-drained soil with full to partial sun exposure. Space plants 2-3 feet apart. Water regularly, especially during dry spells, to keep the soil consistently moist but not waterlogged. Fertilize in early spring with a balanced, slow-release fertilizer. Prune in late winter or early spring to maintain desired shape and remove dead or damaged branches. Protect from harsh winter winds and heavy snow by wrapping with burlap if necessary.