When describing a plant or tree, "fully leaved out" indicates a state in which all the leaves have grown to their maximum potential. Synonyms for this phrase may include "lush," "dense," "abundantly foliated," "thickly covered," "fully grown," "luxuriant," and "flourishing." These alternative phrases can convey the same message, indicating that the plant or tree is in a healthy and robust condition with a full complement of leaves. Whether used in gardening or nature writing, these synonyms can help to vary the language and make descriptions more interesting and vivid.