Answer: Plant size determines the size of the nursery pot. By nursery standards, a one-gallon landscape plant will be young and small; one in a 5-gallon plant will be 3 or more years older than the one-gallon sized plant; one in a 15-gallon container will be 7 or more years old. The size matters if you want a plant to look more mature in your landscape, or if it is a fruiting tree or shrub, it will already be old enough to bear fruit. The smaller the plant size, the smaller the container and the less expensive it will be, but the longer you will have to wait for it to mature. Hope this clarifies things for you.
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