Aloe castanea grows very well in cultivation and is suitable for rockeries and water-wise gardens, where the winter is cool with light frost or no frost, and also as a pot plant, using a large pot. It grows well in full sun and must be planted in a well-drained soil. During hot weather, water once a week and twice a month in normal summer temperatures, and once a month in winter. When mature plants are removed from the soil, or are being transplanted into bigger pots, leave the plant out of the soil for 2 to 3 days to dry and cut off the old roots to prevent rotting of the root system and promote growth of new roots.

Aloe castanea can be propagated using both sexual (seed sowing) and asexual (stem cutting) propagating methods. Sow seed in the warm months (mainly August-September), on coarse river sand and slightly cover the seeds with a layer of sand, not more than 2 mm deep, and keep the medium moist. Seeds germinate after 3 to 4 weeks. Transplant the seedlings 2 to 4 months after germination. Seedlings must be transplanted into a medium consisting of 2 parts coarse river sand and 1 part of well-rotted compost. Asexual propagation is done with leaf and stem cuttings removed using a clean, sharp instrument. Allow the cuttings to dry in a cool, airy place, away from direct sunlight, for a few days, until the cut ends have dried and dust the wounds with a fungicide. Plant the cuttings in a well-drained potting medium, in a lightly shaded, cool area, with high relative humidity. Keep moist but not wet. Where possible, for stem cuttings, cut at the base of the branch to get better rooting rate and rooting percentage.

Aloe castanea is prone to gall mite (aloe cancer), white scale, aphids, rust and they can be controlled by a fungicide or pesticide application. Prevent plant infection by sterilising your growing medium, tools, use only disease-free seeds, and also monitor pests and control them at an early stage to prevent spreading. Remove and dispose plants infested with gall mite, as it is difficult to treat it.