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Native to the Mediterranean region, the bay tree is widely cultivated as an ornamental there and as a houseplant in colder climates – mainly because it’s an excellent candidate for growing as a topiary. Hardy only to zone 7, it’s ideal for forming low hedges. Although it can grow into a tree up to 40 to 50 feet tall, bay is often maintained as a large shrub in containers. In spring, it puts out small yellow flowers, which by fall develop into dark purple berries.