Eulychnia castanea monstruosaThe thick, cylindrical stem of Eulychnia castanea monstruosa can be a little intimidating. Short, yellow spines zig zag across the stem, with fresh spines emerging in a deep orange hue, while older spines lower down fade to a pale yellow. WATERING Water when 100% of the soil has dried out. Keep dry during winter months. LIGHT REQUIREMENTS Full sun. FEED Use a cactus fertiliser 3 times between March November. REPOTTING Repot every 2 3 years. Use a well