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In the case of bean seed , fees are required of seedling fields to be harvested for certification the year of planting . However , planted millet that grows on its own in subsequent years after the year of planting is considered natural vegetation . Best to remove flowers from plants in the year of planting and in the following year so as to prevent fruit set and to encourage new vegetative growth . Irrigation - In most seasons and on most soils , irrigation is absolutely essential the year of planting . Except for bean seed , required of seedling fields to be harvested for certification the year of planting . After adding one year for the seedling year of plants first spotted as juveniles , the average life span of these plants is 3.58 years .