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Herbs are plants with weak stem, they are very small,they have few branches, they have green and tender stems, these plants are usually less than 1 metre high..... Shrubs are plants with hard but not thick stem,they are medium sized, branches arise near the base of the stem,they have many branches, these plants are usually 1 to 3 metre high...... Trees are plants with hard stem, they are very tall, branches are on the upper part of the stem, they have brown,thick and hard stems, they are generally more than 3 metre high....