Just an idea, start up a new game save but put it in the season you are desiring to see what it looks like when the plants are alive. Then save the lot to your library, and then place the lot down where you want it at in your current game save you are trying to see. Or better yet, if you are pretty much done with the lot, save it to your library, and then place it down in the new game save I mentioned and continue to work on it in the new game save set to your desired season. Then afterward save it to your library, and then place it in your current game save. I hope this made sense.