Is it better to use Flowerpots or Garden Patch for Thavnairian Onions?

I've tried using Flowerpots, but they don't yield any seeds, will planting in Garden Patches do it?

You'll never get seeds when using flowerpots, since seeds are only generated via crossbreeding so you need at least one adjacent plant (putting two flowerpots next to each other doesnt count).

Planting them in a garden bed has a chance to yield certain seeds if you crossbreed with the correct plants. There is no known crossbreed that will give you new Thavnarian Onion Seeds from a Thavnarian Onion plant, though. You can crossbreed them with gridanian or ishgardian tea for a chance of other chocobo food seeds (like Sylkis and Mimett), which in turn can be used in a crossbreed with jute to potentially produce new Thavnarian Onion seeds.
Crossbreed chances increase by using Thanalan Soil, but getting seeds isnt 100% and some of those crossbreeds have more than one outcome. I'm running a cross like this atm and my personal experience (with a way to small sample size to say anything definitive) is that I'm getting about a 50:50 split between mandrake-seeds and chocobo food-seeds from my Thavnarian Onion crossbreed.

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Originally Posted by Vidu

You'll never get seeds when using flowerpots, since seeds are only generated via crossbreeding so you need at least one adjacent plant (putting two flowerpots next to each other doesnt count).

Planting them in a garden bed has a chance to yield certain seeds if you crossbreed with the correct plants. There is no known crossbreed that will give you new Thavnarian Onion Seeds from a Thavnarian Onion plant, though. You can crossbreed them with gridanian or ishgardian tea for a chance of other chocobo food seeds (like Sylkis and Mimett), which in turn can be used in a crossbreed with jute to potentially produce new Thavnarian Onion seeds.
Crossbreed chances increase by using Thanalan Soil, but getting seeds isnt 100% and some of those crossbreeds have more than one outcome. I'm running a cross like this atm and my personal experience (with a way to small sample size to say anything definitive) is that I'm getting about a 50:50 split between mandrake-seeds and chocobo food-seeds from my Thavnarian Onion crossbreed.

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Is there any use in those crossbreedings, except for the "fun" of it?

The reason I asked was the information on the linked page, that seems to indicate there's a chance for 1 seed no matter topsoil. If this isn't correct I'll just continue planting them in flowerpots.

https://ffxivgardening.com/seed-details.php?SeedID=46

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Originally Posted by Angelhearth

Is there any use in those crossbreedings, except for the "fun" of it?

The reason I asked was the information on the linked page, that seems to indicate there's a chance for 1 seed no matter topsoil. If this isn't correct I'll just continue planting them in flowerpots.

https://ffxivgardening.com/seed-details.php?SeedID=46

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Crossbreeding is the only way to get/produce certain seeds - and as I laid out: you can use a crossbreed with Thavnair Onions and tea to get Premium chocobo food seeds, which can be used again to crossbreed Onions and create a cycle that will constantly provide you with the seeds you need. Personally I consider it a waste of a good crossbreeding chance NOT to crossbreed, but you do you...

You'll only ever get one seed by crossbreeding and ONLY by crossbreeding. Thanlan Soil increases the chance of a sucessful crossbreed in the first place - aka: even if you attempt to crossbreed, you might not always get a seed (and not always the seed you want either - most crosses have more than one outcome).