I'm reading AVI M4 - Watch out, watch out for tickle weed!

Everyone knows a master with a vegetable garden. But what if the class needs to help? And the master warns about tickle weed? Super funny book about master Karel and his students in group 4.

Master Karel's class has a vegetable garden.
Beans, leeks and berries grow in it.
Goof can also plant something.
Her aunt's seeds are doing well.
The leaves are quite tasty.
But it does make you itch.
Not that bad in itself.
As long as you don't scratch...