A group of trees may be referred to as a forest, grove, orchard, stand or thicket. These names are usually awarded depending on the number of trees being grouped together and the type of trees as well.
Or in easy language A group of trees is called a grove or a cluster of trees or copse of trees.
hope it helps you........

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A group of trees can be known as a forest. where lots of  wild trees are grown without any human effort .
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yes , its absolutely correct as we usually see group of trees in jungle , rainforests,etc
yup .... :D
hi, Fatmamehdi
hi apl