Humpty Dumpty in the Garden

From the cassestte inlay:

Humpty Dumpty is having all kinds of problems. He has to water the flowers in his garden, but whilst he does, the weeds keep growing! Can you help Humpty Dumpty to keep his garden free of weeds?

By turning certain taps on and blocking holes you can direct the water from the sprinkler onto the flowers and not onto the weeds.
It is not as easy as it sounds and you had better be careful not to get swamped in a jungle of weeds.