Hi Palmarina
No, there is way to see the whole total of flowers in all farms at once.
But you can do the following adding a little maths, less than using the Farm Stats.
If you own the Tower crane, the tool to store in bulk, you can go to the farm where you have the flowers. Then click in the Tower crane and click in one flower, no matter which one.
You will see a window asking you if you want to store xxxx amount of that particular flower.
But the second option says if you want to store all xxxxx amount of flowers in that farm.
That is the amount you need.
Of course do not send them to storage, just take note of that total number of flowers in that farm and click in the red X.
You have to do the same in all farms where you have placed flowers. After gettings all amounts just add them and you will have a total you can share with your superneighbor.
Please take in mind, that way you will get a total amount per farm and for all farms, but it doesnt mean that the flowers are ready to harvest at that moment.