Cactuses pl. : of Cactus

Example:
Why are all the baby Cactuses in my greenhouse turning all black?

Taxonomy
cactus, species, columnar cacti, plants, stems, succulent, flowers, cactus flowers, leaves, genus, transpiration, diameter, the leaves, spines, family, Cactaceae, cactus species, moisture.

Defination from the web:
cactus species are night blooming, as they are pollinated by nocturnal insects or small animals, principally moths and bats. ... The cactus family is endemic to the Americas with one exception, Rhipsalis baccifera; this species has a pantropical distribution, occurring in ...