Flowering Cacti Joy! (Mouse Tail Cactus / Rhipsalis Horrida )

It flowers every year without fail and needs little care. Always a joy to see. But is it Cactus or Cacti?

Cacti is the Latin plural of cactus, and for English speakers is a more widespread usage. Cactuses are the English plural and is also completely acceptable to use. Dictionaries list both as being correct leaving it up to the user which they prefer.