They do not have developed ligneous stiffened structures. They are generally frail. We find them in plants like the following:
Annual plants: Plants with a year life-time. Weeds generally belong to this group.
Vivacious plants: Plants with aerial stems lasting a single season, but keeping underground structures from which new stems spring again next seas on.
They have developed rigid, stiffened structures, what we normally know as "wood". According to the height they attain we classify them into:
Trees: Plants with ligneous stems, with a superior height of five meters. In this case we call the stems trunks. They do not generally branch up to a considerable distance from the soil.
More information about trees / Fruit trees/ How to plant a tree
Shrubs: Are those plants with ligneous stems, from one to five meters tall. In this case, branching begins at soil level.
Bushes: Ligneous plants shorter than one meter tall.
To find more information about stems...
More information about plants cultivation in the listing above.
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