Powerberries (StH)

From Harvest Moon - Wiki on Neoseeker

In most Harvest Moon games there are Powerberries, or, Powernuts. They are very helpful because they increase your amount of stamina overall. Here is the list of all five:

• Cutting grass in your pasture with your sickle.
• Plowing the ground with your hoe.
• Find one while fishing.
• When one of the harvest sprites (the yellow one) is missing, your dog will find it. In return the sprites give you a power berry the next morning.
• Plowing the ground in Paria Sacred Forest.