(Link) Zucc. ex Pfeiff. & Otto
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Echinopsis oxygona is native to South Brazil, Uruguay and northern Argentina. Its features include: many robust spines, spherical shape, and a large flower, with sharply pointed lavender or white petals, and a fine faint scent.
Echinopsis oxygona is known for having huge, showy flowers at the ends of long tubes which are connected to the cactus. The flower has a sweet smell. The flower grows at evening and dies the next afternoon on hot days. It grows well in full sun, or light shade. These cacti can stand strong heat, and even temperatures as low as -10 °C (14 °F). Usually these are outdoor plants. These plants are used to the dry, desert climate, so they do not need to be watered every day.
On cool days it will last longer. Usually, the cactus will start to have little buds appear at its base. These buds can be plucked off and transplanted into a different pot for further growth into a mature cactus. Usually, the cactus will bloom in mid summer.
Size and growth
When buds, plants are quite small, but can grow quite fast when young. When in a pot, the cactus may grow up to one foot. Otherwise, the cactus may grow even taller. Usually, these cacti may live for very long periods of time.