It would be ideal if the seasonal shift setting could be set by zone rather than for all zones. Common use would be for plants or trees that are not established or for a redwood tree where the limited rain water isn’t enough.
@tessuhh, are you currently using one schedule for all of your zones? If so, you might want to consider creating different schedules for the different vegetation types you mentioned. By doing so, you can enable/disable seasonal shift for each schedule which should address the use case outlined. For details, please see #6 in this support article.
Let me know if this helps