Organ Pipe Cactus  Lemaireocereus thuberi - this cactus is a native of Arizona and parts of Mexico. It is a ribbed, columnar cats, sometimes branches from the base and reaches the height of 15-20 feet. It blooms throughout May and June , followed by the edible red fruit. I have 3 plants on big pots. They don't require too much water but dies well with a good watering twice a week. The white flowers only last one day and it usually blooms at night .