This guide is strictly on farming from fences using plant breeding.
There are 3 ways to get Fruit of X:
1) random rare bonus when hoe-ing any wild plant
2) random rare bonus when harvesting crops in your farm
3) not-random rare bonus when harvesting SEEDS in your farm.
Abundance - Sunflowers, Strawberry, Grape, Onion
Crimson flame - Pepper, Garlic, Hot Pepper, Pumpkin and Olive
Destruction - Sky Mushroom, Dwarf Mushroom
Enchantment - Silver Azalea, Fire Flake Flower, Silk Honey Grass, Dry Mane Grass and Sunrise Herb
Magic power - Emperor Mushroom, Hump Mushroom
Nature - Carrot, Barley, Seed Potato and Sweet Potato
Perfection - Fog Mushroom, Arrow Mushroom, Cloud Mushroom
Sun - Tomato, Paprika, Wheat and Corn
Thanks to Deioky for original information.