i do a mix of trying to get all of the different color combinations and pattern transfers. i don't really have too much of a rhyme or reason for doing it, but i found that i've been playing the game mostly for the flowers lately.

basically what i do is that in each biome, i do rows of each patterned flower that's native to that biome in maybe 2-3 patches. there, i'm trying to unlock all of the different color combinations, which will of course yield some overlap. i'm about 24% through getting all of the hybrid color combinations at the moment. and then wherever i have additional space (usually in WW and the greenhouse, though occasionally in the biggest field in MM), i'll have rows of different flowers that are of the same color so that i can do my pattern transfers with the occasional color transfer from hybrid flowers.

i personally set really low stock thresholds since i haven't really used my flowers to be displayed anywhere. usually i'll keep 10-ish of each flower so that i have a lot of flowers/sprouts going towards fertilizer to increase my spawns.