This project has moved to Planet Minecraft.
This data pack plants saplings, seeds, crops, nether wart, chorus fruit, and sweet berries, if their item entities are sitting on the usual blocks they can be placed on, and there's nothing obstructing where they would be planted.
By default, it takes a minute for the item to plant itself. If you'd like to change that, you can find the config file in the data pack .zip at "data/take_root/functions/config.mcfunction".
More information about data packs and how to use them can be found on the official Minecraft Wiki.