Transplants are grown when the customer wants a larger, more robust plant. A typical transplant is grown for one year, and then planted back into nursery beds and grown for another 1 to 2 years. Nurseries either grow seedlings specifically for transplanting, or use smaller stock that have been graded for transplanting. Mechanical transplanters use a vertical "shoe" to open the soil, and a wheel with clips places the seedlings into the slit at the proper spacing.
You must attribute the work in the manner specified (but not in any way that suggests endorsement). You may not use this work for commercial purposes unless permission is granted by the photographer or copyright owner.