Pumpkin Dragon's Lair

"There are many types of dragons: metallic, chromatic, undead, ethereal, etc. However, it is said that there is a very very strange one: the pumpkin dragon.
His hiding place, his lair, is at the end of a disturbing field of huge pumpkins, capable of casting spells on anyone who approaches.
No one has ever seen this dragon, no one knows what shape it has"