Here's some extra details for the feat. Doing the following will get you points in this feat:
1 point:
- Petting or watering trees
- Petting or feeding piggies (for a maximum of 3 points per piggy[1])
- Messaging butterflies
- Using fertillidust lite
3 points:
- Singing to butterflies[2]
- Using fertillidust (per use, not per tree affected)
Harvesting trees, nibbling piggies, milking butterflies and squeezing chickens will reset your tally up to that point on that street to zero. However, if you continue to do the actions that give you points after you harvested, those points will still count[3]. Your tally is added to your contribution after you leave the location, or reload the game. Your contribution will never decrease.
All locations that have animals and trees count. This includes your backyard, home streets, streets in Ur and enchanted forests.
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Footnotes:
[1]: Any amount of food will do, including 1 grain
[2]: Doing this while on no-no counts
[3]: The upshot of this is that if you want to harvest, do it before watering and petting