EXIT Puzzle: In The Greenhouse

Strange things are going on in your aunt's greenhouse. From one day to the next, all vegetables became inedible and the plants and flowers stopped growing. This can only be blamed on the evil neighbour, who has a penchant for black magic and can conjure up evil spells and even nasty gnomes.

Can you manage to free the plants from this magic, or to catch these gnomes or whatever? In all this mess, is there any way to get any clues like ...?