This one may be a good one to breed to or self!Many have come and gone in that time for sure! This one is just a tough old guy. All my slippers are in an unobstructed east window. Winter temps 60-70 F, summer 70-80 F. Watered with standard city water every 5-8 days depending on season. Fertilizer with 15-30-15, 3 out of 4 waterings from March through October..I even fertilize in winter but only every second watering. Repot once every 2 years in a bark-perlite mix. Really nothing out of the ordinary. The plant is in a 7" pot! I have to divide as it is getting out of hand.