Cactify is a procedural geometry nodes setup for generating barrel cacti (Ferocactus cylindraceus) in Blender environments. The tool integrates with weight painting workflows, allowing users to assign vertex groups to control instance density and maximum length across surfaces. It includes customizable parameters accessible directly in the modifier panel, such as minimum and maximum diameter, height multipliers, ridge count, and overall cactus shape. Users can also adjust spine density, length, and size, and toggle the appearance of floral blooms. The setup comes with pre-configured materials that can be assigned to the main body, spines, and flower parts through the node interface.