Can I plant boxwood in planters on balcony in full sun and leave out though the winter months? Also, what type of boxwood would be the best to buy? Thank you.
Boxwoods are popular for this. They grow slowly so do not need to be repotted often. They will at some time need to be repotted, but it could take several years. Regular potting soil is best. Also, make sure that you also add plenty of slow release fertilizer to your container plants. This will help with making sure that your evergreens have plenty of nutrients to keep them growing well. The addition of some mulch to the top of the container will not only help retain appropriate levels of moisture but will help to slightly acidify the soil as well, which most evergreens like. It will also be helpful during winter, along with wrapping the base with burlap to keep them warm.
I would look for a variety that is well suited to your growing zone, especially since it's going to be in a planter. In fact, one zone below would be even better. You also might try looking at Inkberry. It has a similar look to boxwood. It grows slowly as well, but is typically a little more cold hardy than boxwood and can take the winter better.