>>543418935
shop seeds are always A_B_C_D_E_F_ if planted alone, planting them next to each other (1 - 2) will make them pollinate with each other, possibly passing the recessive (lowercase) genes to each other and making them the actual dominant ones
if you end up with a dark purple flower for example, that a XXXX ccddeeF_ flower (XXXX for A and B genes as those are shape and completely irrelevant for the achievement itself)
if you leave that flower alone with 4 planted around it in a + shape, you have a chance of getting a black flower, meaning that dark purple is an actual perfect flower (XXXXccddeeFf), which you can just keep using in the same manner while doing the same with the black flower, so you'll have 2 + shape beds with the dark purple and black flowers in the middle, eventually replacing the dark purple with a second black and a third, only then actually harvesting them because black flowers don't give seeds
once you're done, leave those 3 main flowers in the + shape so your roommates can then plant around it and collect their own black flowers for the achivement
of note roommates cannot collect your flowers, but they can collect the pollen to pollinate a flower that is further away from the +, so you can effectively polinate 5 flowers at once instead of 4 (pollination period lasts 30 minutes after the flower is done growing)
also you can use tulips to pollinate roses and hydrangeas as well, so once everyone is done you can just plant hydrangeas around the tulips to get the best possible income flowers in the game (aaB_ccddeeff, different shape than perfect tulip and rose but can be inherited from both aaB_ and aabb)
i do not have any diagnosed mental illnesses