cacti / cactuses
The two plurals of cactus.
Both cacti and cactuses are standard. Cactuses is the ordinary English plural. Cacti is the Latin plural and is common in plant writing. Pick one in a piece and keep it.
Examples
UseThe yard has three cactuses.
UseThe yard has three cacti.
Avoidmixing cacti and cactuses for the same plants in one piece