Build up bonus slots

[HonoraryNortherner]

One of my favourite slots is Golden Fields. When I play slots I like to see in advance when I might be due a big payout coming. Golden fields has a plant above each reel and when you water it three times it grows and then you get an expanding wild on that reel. It's fun because you know that once you have built up some plants you are gonna be more likely to win more back. What are some other slots people play that have this kind of reel specific build up bonus?