Graham points out that 'overwatering can also cause stress to a Christmas cactus and make its leaves turn red. Check that the soil of the plant is well-draining, and water when the top inch or so ...

with deep red flesh. Desert fruit: Referred to as tuna in Spanish, and figue de Barbary in French, this thorny fruit grows on top of edible cactus paddles, or nopales, in desert regions ...

DESCRIPTION: The Florida semaphore is a tree-like cactus with a distinct trunk and a cluster of spines at the top. The cactus has a dull-gray, fleshy stem with shrubby branches that can grow to a ...

An curved arrow pointing right. Cochineals are tiny bugs that live on prickly pear cactuses. The acid in their guts makes a red dye used in textiles, cosmetics, and foods like M&Ms and Yoplait yogurt.