if i don't harvest all of my crops in a certain time do they eventually die or stay until they're harvested. like now i have all my farmers on the research table cause i need teck points, about 1/2 the crops are harvested and i have plenty of food in the bin.

They do... the log file records them as "spoilt".. so the 800 are new crops altogether.

I have never seen them spoil.

They dont state spoil in the game, but they are recorded in the log files as spoiled cuz they werent picked when the new crop came up.

So if you have 120 left to harvest when the new crop of 800 comes up - you wont have 920 -- you will have 800 like you would if they were all harvested - so the 120 that werent gathered are "spoiled" or lost. The log file for the game will say something like "120 crops spoiled", but your actual game screen will not say anything at all.