"The sweet fruit of the prickly pear cactus."
Cactus Fruit are usally found in Calico Desert. Cactus seeds can be bought from Sandy at the Oasis for around 150 gold which is a pretty good deal. They can also be bought from the Traveling Cart on Fridays and Sundays but her prices are always changing. Seeds take about 12 days to grow and are ready to be harvested at that point. After each harvest it takes about 3 days to be produce more fruit.
Everyone I know feels pretty neutral about Cactus fruit except for Linus, Pam, and Sam who love them.
When you eat a Cactus Fruit it honestly feels like you gain 75 energy and 33 health, I know crazy right!?!?. Sometimes, if you're lucky you may be able to forage one that is iridium level, when consumed it almost feels like you gain 195 energy and 87 health!!!