@Nilla I believe that you did say that

Yes I certainly did have that issue with my greenhouses at first, but I think I have that sorted out finally. I have a stable with two workers for each greenhouse group. I have three water towers, one central and one on either edge. I keep an eye on the water inventory, and occasionally I increase or decrease the number or watertower workers as needed. It's been a few years since I had any greenhouses run out of inputs.
I should probably check how much fertilizer I have lying around
