Once a plant has matured a little, it will enter the young plant
phase. From there it will continue to grow.
This is a mature plant
When a plant becomes mature, it can be harvested. You can harvest a plant by interacting with it.
You can harvest from a plant as long as it's in its mature stage of life once every day or so.
This is an elder plant
, the final stage of a plant's life cycle. Many plants won't reach this stage!
An elder plant can be harvested one final time, with much greater possible rewards.
Once an elder plant is harvested, it disappears and cannot be revived.
You can choose to remove a plant or dirt pile with the Plow Spell