Here's why:

* Clone: A clone is an organism that is genetically identical to its parent. In plants, this can be achieved through various methods like cuttings, grafting, or tissue culture.

* Other terms: While other terms like "cultivar" or "variety" may be used in horticultural contexts, they don't specifically refer to genetic identity. Cultivars and varieties can have variations within the group, even if they share common characteristics.

Therefore, "clone" is the most accurate and scientifically specific term for a group of genetically identical plants.