How is crossbreeding Jute and Tantalplant?

[Angelhearth]

They don't cost an arm and a leg because you produce most or all of the seeds yourself. The only cost is in setting up the initial growth cycle, and occasionally supplementing your stock if you have a bad string of RNG getting the chocobo food seeds.

The drawback is you don't get quite as many Onion seeds since your other plots are growing the seeds you need to get the Onions (but then one of those plots will also be growing the Onions to produce some of the seeds needed). On the other hand, you can make up for that by selling the excess seeds you produce or the items those seeds grow.

It becomes a choice - spend a lot of gil to buy the seeds you need to get more Onion seeds but cut into your profit margin, or spend very little gil but get fewer Onion seeds. Not knowing what you're paying for the seeds you're using or how much you're getting for the Onions/Onion Seeds, it's hard to say what's more profitable in the long run.

If you want to stick to the compact set up, at least switch to something other than Royal Kukuru Seeds. Jute, Broombush, Royal Fern, Blood Pepper and Glazenut all cross with Tantalplant to produce Thavnairian Onion Seeds but the items they grow are also valuable while Royal Kukuru Beans aren't. You'll make back most if not all of what you spent to buy the seeds.

1. I used Old World Figs to get the seeds I needed, but they didn't produce enough, and the product wasn't worth anything, so I switched to Jute already.
2. I was told the onions don't produce seeds on their own, so I use flowerpots to grow them.
3. I use all 3 beds with the 3+5 setup, none for getting seeds. Not sure if that's smart or stupid, but there aren't anywhere on the net they really go into this, as I could find.