continued effort to do or achieve something despite difficulties, failure, or opposition
This is the orange tree that we planted in our backyard not long after we bought our house. Last winter was a cold one down here in Texas and we forgot to cover it up a few of the nights of freezing temperatures and it was pretty "dead" by the end of winter. Jason almost dug it up, but decided to leave it and after 9 months, here it is. The green is all new growth, but you can still see the dead branches that was the tree before.