First some patience. The few leaves shown in the image you sent may be the first leaves as more will appear as the weather warms. A newly transplanted shrub will sleep the first year, then creep the second and finally leaf with growth the third year. Because this shrub loses foliage in the winter, I do not think it needs a wind cover in the spring or summer. Nature's protection form wind is plants that have no winter foliage. The leaves look a bit pale so perhaps a slow-release plant food such as Osmocote applied now in the spring will get this potted shrub off to a stronger start. This magnolia will survive winter temps higher than negative ten degrees so if you see severe winter weather coming move the pot into a sheltered location. This magnolia also likes full sun so move it to more sun if it does get at least 4 to 6 hours of sunshine. Keep the soil moist but not wet and make sure the pot has good drainage. In another month (June) you should see larger leaves and by year three more blooms. Keep growing, Marianne Binetti