@Zerglingman @Ace66062 @BackupHitter @ceruds wild cotton exists, and drops seeds a percentage of the time when harvested. Wheat seeds come from ordinary grass in the plains biome. Papyrus grows near water in desert or savanna biomes.

Most seeds/saplings only grow when two conditions are met: 1) placed on a dirt block that's been turned farmable by a hoe, and 2) the farmable block is adjacent to water. Papyrus only needs the second condition, though, since it only exists as a block without a seed/sapling form.