The plural of leaf is leaves.
The parts of a plant or tree which are attached to its stem and are used for the process of photosynthesis. They are typically green in color and flat in shape.
The word "leaf" comes from the Old English word "leaf" (meaning "leaf"), which is related to the Old High German word "leib" and the Old Norse word "leifr", both of which also mean "leaf".
The plural form of leaf is leaves. This follows the regular convention for pluralizing words ending in f, which is to replace the letter f with a v and add -es to the end.
The spelling leafs is never used in English, except in cases using an apostrophe to imply the singular possessive form. Eg. the leaf's color had turned orange by the end of September.
It is important to note that the rules for forming plurals in English can be complex and sometimes unpredictable, and there are many nouns that have irregular plurals that do not follow any particular pattern.
Here are some example to illustrate the difference between the singular and plural forms of "leaf":
The graph shows the occurances of the plural of leaf in written English since 1800 using Google's Ngram Viewer.
Leaves are actually considered to be plant organs as they are a collection of tissues which perform the common functions of photosynthesis, gaseous exchange and transport.