Shasta Doublefile Viburnum thrives in well-drained, moist soil and prefers full sun to partial shade. Regular watering is essential, especially during dry spells, to maintain soil moisture. Prune after flowering to shape and remove dead or crossing branches, encouraging a bushier growth. Fertilize in early spring with a balanced, slow-release fertilizer to promote healthy foliage and blooms. Ensure adequate space for growth, as this shrub can spread widely.