Quote Originally Posted by Vidu View Post
Plant your first krakka root using the throw away soil, then plant an eggplant with Thanalan III next to it, next to that krakka and so on.
I would actually start with the eggplant first. Eggplant seeds are usually dirt cheap on the MB compared to Krakka Root seeds at the vendor. That way you're only wasting about 400 gil instead of 3900. It's still the same result in the end.

Also, many players with small houses growing Thavnairian Onions don't harvest the Tantalplant or whichever chocobo food seed they're using because of limited gardening space and the annoying RNG for getting a new set of seeds. They'll leave the Tantalplant in place and just harvest/replant the other seeds. The harvested items from the other seeds tend to cover the cost of buying those seeds. Growing time is devoted to producing the onion seeds instead of interrupting the cycle to get another set of chocobo food seeds (and dealing with it's RNG).

Someone with a medium or large can set up a different seed cycle in each garden plot so it's easier for them to be harvesting everything because they can be constantly replacing what's used in the onion seed plot with what's grown in the chocobo food seed plot.