root rot astrophytum ornatum cactus closeup

astrophytum ornatum bishop 039 cap monk hood cactus starshaped plant cactaceae grow pot thorn prickly succulent spine closeup growth desert green horticulture unique houseplant garden nature gardening ripping needle isolated cultivate cylindrical astro unusual water watering roots rot fungus damage dry killed care negligence drying die dying cacti root damaged overwatering