The beautiful Mexican fencepost cactus! This is the cactus that I saw and fell in love with first that started my cactus journey!
These lovelies need sun and heat so outside in the warmer months is best! If they are indoors too long (outside of just the freezing winter months) they will etiolate. Water about 1.5-2 weeks in the dead of summer when it’s 95+ and every 2 weeks in spring and fall, then in winter they need to come inside once it gets below 40 degrees and only watered about every 6-8 weeks.