As a general rule of thumb, a little less than the harvest of 3 plants will allow you to extract 4 seeds.Notes and things you should know beforehand You can find all three in the original SeedsPlease! thread. This mod has some requirements, you must have HugsLib installed (I think it's best to load this one right after core since it's a very popular lib) and then Vegetable Garden, Mod Friendly Overrides (MFO), SeedsPlease! and SeedsPlease! Vegetable Garden Addon and load them in that order before this patch. If you check the spreadsheet you can see some 'Hardcore' values, I am thinking about a harder version at some point, but I don't think it will be necessary. If you think the balancing is bad/wrong/could be better, please do leave your suggestions here and I will get to them. I did a little bit of simple math (and arbitrary numbers) to find better values for seeds and extraction rates, you can find the spreadsheet here with all the values. How did you even reach this super arbitrary numbers? It also adds a new trader, the 'GreenHouse Trader' in both Caravan and Orbital Trader form, they sell raw foods for you to cook or extract seeds from, buy seeds and a couple of barn animals.

The original mod's intention is to add immersion, this patch adds a little bit of 'realism', or at least uses the mechanic of the original mod in a way that it feels like you can grow and scale with time. Well to start off, this is just a patch, I liked the seeds mod a lot but found it was unfair here and there, especially when the game constantly uses blight and cold snaps and you run out of seeds, which are super hard to find, cost a lot of money and the extraction bill most of the time set you behind on seeds instead of helping you make your garden bigger. Sorry about the size image, I was too lazy to resize.

A16 rimworld seeds