Konjac's leaves, roots and flowers all withered and died at the end of the growth cycle, only the stem to remain, become a continuation of growth, pregnant with roots, leaves, flowers, fruit regeneration organ.

Konjac stems shorten for underground fleshy bulb, terminal buds fat, different species of buds of different colors, such as flower konjac pink, white konjac for white. Terminal buds for leaf buds called leaf buds bulb, terminal buds differentiated into flower buds called flower buds bulb. Two kinds of bulbs in addition to the buds of different forms, such as the Wanyuan flower konjac leaf buds for the inverted "V" shape, flower buds for the inverted "U" shape, and planted after the growth and development is completely different, there is no other significant difference in the morphology of the bulb, all in the periphery of the terminal buds have a leaf trace circle, that is, the previous growth There is no significant difference in bulb morphology, except that there is a ring of leaf traces on the periphery of the terminal bud, i.e., the traces of petioles shed from the outer layers of the previous growth cycle. In the production should be identified and applied to avoid misplanting taro. In this circle to form a slightly concave nest, called the bud nest, the nest of the nodes is very dense, the buds on the nodes like bud eyes. The entire upper end of the bulb can not see the obvious nodes, but visible nodes on the bud eyes on the bulb is clearly arranged in a spiral. The upper end of the bulb also has more bud eyes and issued rhizomes and adventitious roots, and at its bottom (a few on the side) there are residual umbilical marks, that is, the seed bulb detachment marks.

Different ages of konjac bulbs have the above basic structure, but in the konjac many years of growth, the bulb external morphology changes significantly. In production can use the external morphology of different bulbs to distinguish between different ages of konjac, in the selection, seed retention in the greater help (Figure 1).

Figure 1 Changes in bulb shape at different ages

After the dormant period of the konjac bulb ends, the leaf primordia of the terminal buds rapidly differentiate into the petiole rachis and 3-lobed leaves. Later, at its base, the tip of the new bulb began to differentiate endogenous buds that is the following year's terminal buds, pregnant with a new plant, so that the konjac growth of the early stage of the plant for the "three generations of the same house". That is, the seed taro has not been shed for the first generation, is growing the new bulb for the second generation, the petiole base of the new bulb at the top of the endogenous buds for the third generation.

Rhizome by the shortened bulb nodes on the axillary buds occur, the general seed cultivation of plants from the second year of life, the bulb reaches a certain size, after accumulating a richer nutrient, its side buds began to develop and elongate for the rhizome or go stem. Most of the plants cultivated from rhizomes have rhizomes occurring in the same year. Species and varieties of different, the number of rhizomes occurring varies greatly, such as white konjac can occur from a bulb of more than ten rhizomes, length 10 ~ 15 cm, in fertile soil, the growth of vigorous, length can reach 20 ~ 25 cm, 1 ~ 2.5 cm in diameter; and the flower of konjac is generally only 5 or so, the length of 8 ~ 15 cm, diameter of 1 ~ 2 cm; Tianyang konjac is less rhizomes occur.

Due to the dense nodes and buds at the upper and middle ends of the bulb, rhizomes generally occur from the upper and middle ends of the bulb. Rhizomes have terminal buds, nodes, and lateral buds on the nodes. China's white konjac and flower konjac generally slightly expanded at the top of the rhizome, but the Japanese flower konjac in the apical 8 to 14 nodes can expand into a small bulb, and can be naturally detached from the parent bulb. Rhizomes generally do not germinate that year to form a new plant, but become a good breeding material for the next year. Japanese flower konjac rhizome sometimes germinate out of the ground, occasionally grow small compound leaves, the top of the new bulb formed like a pipe, called pipe taro.

The structure of the bulb and rhizome determines that the seed taro should be protected from damage to its terminal and lateral buds during production.