Fertilizer after lab upgrade

[craggy plover]

I have upgraded seed to osmium seed. In this level, does fertilizer still effective (if we compare to profit that we will get). I'm planning to plant like 1000 crops in my field

[coral solstice]

tldr: fertilizer I or II is worth it

Feetilizer I & II is purchasable from Sam's general store or Ling's lab, so it's easier to do. Whereas III you need to craft it, which is not worth the hassle

Take cactus for example

Cactus mead price based on quality is:
5470 / 6280 / 7090 / 8170 / 10870

Fertilizer II cost 70 gold, it's a really good trade for the final product

You can however, use fertilizer III for the greenhouse. Regrow crops and fruit plants live forever in the greenhouse, thus Can continuously produces crops/fruit.