I'm still watering with the watering can

- the brown sprinkler is on the shopping list but under its present configuration the red sprinkler isn't, even though it'd be nice to be able to speed up growth - and I'm finding it a bit inconvenient that recently when I water flowers that are dead, they spring up to their full growth stage whether they're full grown or not. You have to navigate away from the farm and come back in order to see whether they really are ready for harvest, or you can waste people's time hiring them for something that isn't ready.
The weird thing is that it's happening on some farms and not others. Not exactly sure what's making the difference.