general term for plants
芔 is a rare kanji that serves as a general term for plants or vegetation. Its meaning is broad and abstract, covering plant life in general.
芔 is composed of three 屮 (sprout) elements, visually suggesting many plants. The exact historical development is uncertain, but it likely originated as a reduplication of the plant component to express vegetation collectively.
Three sprouts (屮) stacked together represent a cluster of plants, making 芔 a general term for vegetation.
For キ, imagine a key (キー) that unlocks a secret garden full of plants: the key sound cues キ, and the garden is the general term for plants.