The resourceful crops mod adds new crops to minecraft. These seeds however are not used to grow seeds, they are used to grow resources. The resources you can grown include coal, gold and emeralds.
How do I start with the mod?
To start gameplay with the mod what you need to do is collect lots of vanilla wheat seeds, you also need to collect smooth stone. With the seeds and smooth stone you can craft stone seeds which can produce stone (When left to grow like any other crop), and enough stone seeds can be used to make other seeds for example 8 stone seeds and 1 coal can be crafted to make coal seeds. I highly recommend Not Enough Items so that you can check the recipes.
How do I install the mod?
Download the latest version of the mod and simply put it in your mods folder (Forge is required)
Can I use it in my modpack? Why not?
Version 0.0.3: Bug fixes, lapis lazuli and redstone crops now drop 4 lapis lazuli / redstone
Version 0.0.2: Bug fixes, temporary crop textures and lapis lazuli
Once this has all the normal vanilla resources, I'll download it. Then I'll keep up with it as mod support comes along, seeing as how I cant download the 4.0 beta of Magical Crops unless I download a modpack with it.
As far as I can tell, there's no way to get extra seeds when you harvest a crop. Is this something that could be added as a configuration? Not even a high chance, just a way to propagate the plant without having to mine out the entire planet to get the gaianite.