Based on the growth habit, plants are broadly categorised into three groups:
1.Herbs. 2.Shrubs. 3.Trees
The herb is a short-sized plant with soft, green, delicate stem without the woody tissues. They complete their life cycle within one or two seasons. Generally, they have few branches or are branchless. These can be easily uprooted from the soil. Herbs contain enough nutritional benefits, including vitamins and minerals, to make it a part of a healthy balanced diet. Tomato, wheat, paddy, grass and bananas are a few examples of herbs.
Shrubs are medium-sized, woody plants taller than herbs and shorter than a tree. Their height usually ranges between 6m to 10m tall. Their features include bushy, hard, and woody stems with many branches. Although stems are hard, they are flexible but not fragile. The life-span of these plants usually depends on the species. Rose, jasmine lemon, tulsi, and henna are some of the common shrubs around us.
Trees are big and tall plants. They have very thick, woody and hard stems called the trunk. This single main stem or the trunk gives rise to many branches that bear leaves, flowers and fruits. Some trees are branchless like coconut tree; i.e., they have only one main stem which bears leaves, flowers, and fruits all by itself. The life-span of the trees are very large. i.e., for several years. Banyan, mango, neem, cashew, teak, oak are some examples of trees.
In addition to these three categories of plants, there are two more types which need some support to grow. They are specifically called climbers and creepers.