No matter what you write about there is always room for some growth. It could be your character has a revelation about his/her life in a garden. It could be writing about what it takes to make a business grow. If you're a person penning a memoir right now, it may be time to dust off some more of those old childhood memories. Or, for poets, just writing a poem talking about growth in some way.
A lone, pale seed
Lying limp in a palm
Threatening to be spirited
Away by wind and parachute
Down to gritty, wet ground just
Feet below itself so it may spring forth
Fresh and green
There's always room to grow!