Good evening @petra1947 we need to make hay on this level. Do you see the little bundle of hay? Swap it with a water drop when you have one next to it (like we make grass and flowers) and a hay square will appear 🙂

To get to that point we first need to remove the fireflies and then move the spiders from their nests too. Once they are out of the way, the hay seeds will fall down and you will be able to grow them.

Edited to add an updated video 🙂