Crop seedlings in "Beasts of Reincarnation" are very important special items in the game. Once obtained, they can be planted. To collect all crop seedlings, you can do so one by one. First up are soybeans and rice; you can find the soybean seedling in a cave near the rice paddies in the eastern area of the map.
How to Obtain Crop Seedlings in Beasts of Reincarnation
Chapter 1 - Soybeans - Rice (Pickup)