Sure for the most part, you are going to be fine. But not always, and players idea of success will be different. I did have a playthrough (back in A20) where I started with a 10 plot potato farm. RNG was not my friend, as it took about 5-6 cycles before I got enough seeds and produce that after replanting 10 seeds, I had extra potatoes. Now this is not normal as I had other times when I got 5+ seeds when I harvested or found a lot of seeds in loot to supplement my crop production. And I know the game was mocking me because my 10 plot Chrysanthemum farm was doing successful (I was drowning in red tea).
So technically I eventually got a self sustaining farm in that case by always converting crops into seeds, but I didn't feel it was worth the effort as I went about 15+ days with no potatoes from my crops to turn into food.
So now, what I do is plant the seeds I find and harvest them. At LoTL 1 and 2, I just use the crops to expand on my food. At LoTL 3 (if I decide to go that far), I will always maintain max plots by utilizing the seeds I get back, the seeds I find, and convert crops into seeds to get my target.
I wait to plant until I get LoTL 1, but that is really for the farm plot cost reduction.