Not directly rose related but interesting none the less:
Note that I found the legend to be incomplete. Hartford County CT where I’m at grows mostly silage corn, broad leaf tobacco, some soy and sweet corn and a smattering of apples. Sweet corn displays in the appropriate yellow but silage corn shows up in a green shade not present on the legend. Also, grey seems to indicate that there is data from other time periods but not the one being currently viewed.
Roses are not on the map. Write your congressman!