Maximum no. of trees should be an even no so that the distance between each should be same.Exact no. cannot be predicted it depends upon how much free space is provided for planting trees
Only 3 plants can be planted on the nodes of an equilateral triangle.

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In the year the number of plants are not determined so it must be said that you can make an orchid of trees in the shape of a circle. Then you will have to plant it evenly so that the plants do not indulge themselves in each other.