What this suffix does
-grown describes how or where something grew: full-grown, home-grown (locally grown, or local talent/origin), overgrown (out of control with vegetation).

Suffix · forms adjectives
Describes how or where something grew: full-grown (fully grown, adult) and home-grown (grown at home, local).
Written by Bryan López, English teacher · Updated
-grown describes how or where something grew: full-grown, home-grown (locally grown, or local talent/origin), overgrown (out of control with vegetation).
Adjective or noun + grown.
This is not a productive rule you can apply freely: it is a closed set of fixed expressions. Learn them one by one as set phrases.
-grown
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"Full-grown" means having reached full maturity — the growth process is complete. It does not mean "almost grown" or "large but still developing." Applied to animals, it indicates that the specimen is fully mature. Applied to humans or abstract things (a full-grown crisis, a full-grown obsession) it indicates complete development with all the characteristics of the mature form.
"Overgrown" specifically implies growth that has exceeded appropriate limits — a garden that has grown beyond management, a city that has expanded beyond sustainability, a child who has grown faster than its context. The "over-" prefix carries a sense of excess and lack of control: things that are overgrown have grown past the point where growth was welcome.
A trick to remember it
"Grown" comes from "grow". Picture where something grew: home-GROWN = grew in YOUR home (your own garden, or local talent). full-GROWN = grew ALL the way (now an adult).
Exercise 1 · Form the word
Exercise 2 · Pick the right one
"full-grown" describes an animal that is...
The suffix -grown describes how or where something grew: full-grown (fully grown, adult) and home-grown (grown at home, local). In Spanish it usually maps to cultivado / crecido / producido.
"full" becomes "full-grown". It is a typical example of the -grown suffix.
-tion, -ness, -ful, -ly, -able... every ending you need to understand thousands of words at once.