Power Berries

Location	Info
In the field at your farm.	Usually found at upper right area. Dig with the hoe to find it.
On the third floor of the mine.	The mine is only open in the Winter. Dig with hoe to find it.
Win the egg festival.	You only get one from the Egg festival, which is held on the 20th of Fall.
Purchase from the traveling salesman at the flower festival.	He is wearing all black, and in the upper area of Town Square.
Throw a Large Fish into the fisherman's pond.	Only works if nobody is around, and if it is not raining.
Smash the rock on the fisherman's pond.	Can only be done in Winter, and with the Gold Hammer.
Plant all types of flowers, Stu will trade you for them.	Make sure you are at least a little bit friends with him first.
Throw a vegetable in the pond.	Do NOT do any work this day, and say strength when she asks.
Be nice to the botanist.	He likes plant gifts the most. (He is a botanist you know)
Catch at the beach.	The only place you can fish here is from the end of the dock.