Click the green flag to grow the plant. The plant has 30 different growth stages, which vaguely resembles a tree's growth cycle. HOW IT WORKS: A variable called 'first time?' tests if the flag was just clicked. Otherwise, it changes the costume.
@gumboygames who made a 'Green Flag Clicker' with the same concept. See it here - https://scratch.mit.edu/projects/288049451/