Plants that are taller than 20 m are in this group. The pit dug for developing root structure of these plants can be formed as 2 or 3 yearly periods. In 2 yearly period, during the first year, A, C,E parts are dug and filled while in the second year B, D, F parts are dug and filled. In 3 yearly period, in the first year A, D parts are dug and filled, in the second year B, E parts are dug and filled and in the last year C, F parts are dug and filled (Figure 6). When the last filling process is completed, necessary pruning is done and after 1 year, plant becomes ready for transplantation.
Fig. 6. Preparation of a plant for transplantation in four years with root nurturing in three phases.