In this Level you need to remove 24 weeds in only 21 moves!
The best way to achieve this is to aim to make at least one super bloom to help remove large areas in one move.
First, make chains that end down near the slime and break through it as soon as possible to get more flowers on the board.
Then concentrate on getting those big blooms happening.
It can help to work on one side or section of the game at a time.
Don't worry too much about the snail, your matches will deal with it as you advance.