Dark crystals and Fire crystals both work well, though dark crystals tend to be a bit more successful. It's not just about the crystal, it's about what day you plant, what day you feed it a crystal, and what moon phase you harvest.
Best recipe is to get the rice is Grain Seed + fire Crystal (not earth) in any pot. For the highest amount to harvest, I suggest an Earthen Flowerpot this will net u 12-17 if ur lucky or if ur not u might get some ice crystals like i did once ^^
The base price for Tarutaru Rice from the cooking guild when it is completely stocked is 51 gil, and the maximum you can purchase at this price is 13 stacks. The only time you'll realistically see prices this low is after maitenance. Expect to see prices around 150-250, depending on how many game days pass between buyouts.
Highest price I have seen offered is 278ish (~3.3k for 12). You can buy 2 stacks at that price.
never used to run out of taru rice on the ah. now i have gah. <.< wondering if it might be easier to garden it. hmm :) and thank you those who put rice on ah for us cooks. we appeciate it ^^
Just saying in shiva these babies go for 11k a stack and are too easy to make if your low-level and wanna garden I suggest these for a start... Although the grain seed itself goes for 20k a stack so if it's all about the cash it midget be quicker to go that way