The Herbs can be found in the Mountain during Spring, Summer, and Fall, and sell for 100 G. They can be sold, eaten for stamina points, or given as gifts.
In Spring, you'll mostly find Blue herbs in the forest, and Orange and Yellow herbs at the beach.
In Summer, Red Herbs and Blue Herbs in the forest/mountain, and some Purple herbs at the beach.
In Fall, Red and Green Herbs in the mountain, and Indigo herbs at the beach.
In Winter, there's only 2 White herbs. One in the forest, and one behind the church.
Black herb can be found using your hoe in the mine all year long.
Red Grass - 10 Stamina +05 Fatigue
Orange Grass +0 Stamina -0 Fatigue
Yellow Grass -05 Stamina -05 Fatigue
Green Grass +0 Stamina -02 Fatigue
Blue Grass +10 Stamina -01 Fatigue
Indigo Grass +20 Stamina -01 Fatigue
Purple Grass +05 Stamina -02 Fatigue
Black Grass +03 Stamina -05 Fatigue
White Grass +05 Stamina -10 Fatigue