Japanese old saying "Do not give Akinasu (Eggplant in Autumn) to your daughter in law" have two meanings we say.
1. Egg plant fruited in Autumn is very delicious. And the mother'n' law do not want to give it to her provoking daughter in law.
2. Because Egg plant fruited in Autumn has something wrong with young ladies. I forgot it, but might be cool her body? or something like that. So, the mom in law is taking care of her daughter in law.
Anyway I love egg plant.