You’d be better served working backwards. Like “I want to make this thing…what do I need to make this thing…how do I get those components…” and if the components you want can be gained via gardening, go for it.

There is almost nothing in gardening that can’t just be gathered via botanist, so your best is to find something you want and go from there. Things like chocobo food or the mandragora minions.
Here are all the seeds:
https://www.ffxivgardening.com/seed-list

You would be good to just do Thav onions, since you need a bunch to level your chocobo.