You need special water for that flower garden.

River, assuming the lagoon water is flowing, drag a builder to the field and see if it works.

I tried watering the field today after having ALL techs fully researched. I dragged a master builder over to the field. It says "He sees strange dead flowers here." Under "Action", it says "Watering field." only for a split second, and then it quickly changes to something else such as "Nothing" or "Fixing hut." I am perplexed! I have all techs fully researched. And yes the lagoon water is flowing too.

Or you could try a farmer...

hmm... once the lagoon is flowing any villager should be able to water the field... builders will do it without your having to monitor them all the time. Are you actually putting the person in the field?

I'm having the same issue as River - I have the lagoon but when I drag anyone (including a Master Farmer and Master Builder) to the field with dead flowers, for a moment it says "Watering Field" and then it flips to "Nothing" and then they'll go do something else. Can't figure this out - HELP!!

Maybe your villagers dont like flowers', or green. Do they have likes and dislikes?
Or maybe they are just stubborn

I think they were being stubborn because right after I posted that I got them to water the field. So now I've got two of them at it.

Does anyone know at what age the women stop being able to have babies? One of my older ones just had twins!

Arthur forgot to consult the female members of his team on general biological norms... lol. The VV females are definitely non-menopausal

I swear my game is bugged. I have tried dragging about 10-12 different people to the field to have them start watering it, and just as Sarah said, first it says they are watering the field and then it quickly switches to "Nothing".