Answer: Golden biota (Thuja orientalis or Oriental Arborvitae) are evergreens, but there are many named varieties of this plant and each one has its own characteristics and ultimate size range. The spacing you use will depend to some extent on the use you have in mind for the plants as well as on their natural shape. Some are globe shaped, some pyramidal and some rather columnar. As a hedge, one would plant them on center about as far apart as they would grow wide, or possibly a bit closer, say two feet instead of three, especially if they are pyramidal shaped rather than columnar. This way they will have room to develop and mature but the edges should eventually touch. Plant spacing is usually expressed on center meaning from the center of each plant since this is consistent whether one starts with mature specimens or very small plants.
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