Rhombophyllum is a genus that require very little maintenance. In cultivation the Rhombophyllum do very well with the spring summer growing period during which they will be watered frequently and heads for winter dormancy. If you provide the Rhombophyllum with the right conditions, they will reward you with their unique shape, and a proliferation of blooms in spring and summer. Being small plants, a representative collection can be grown on a patio table or a shelf in the greenhouse. Inside they grow fine on windowsills, and will even bloom, if they get enough direct sunlight. Growth Rate: Slow to Moderate. Soil: They need a soil with less organic material; extra pumice or perlite with good drainage. An excellent drainage is essential to these type of plants. Repotting: Make sure to repot during its more active period, starting in spring. Watering: Although they are succulent they need plenty of water but will rot if waterlogged. Treating them like other succulents with limited watering will cause their untimely death. During the winter they can be watered less often, about every 2-4 weeks. Nearly all problems occur as a result poor ventilation, especially when weather conditions are dull and cool or very humid. They must have dry atmosphere. Fertilization: Fertilizing this plant really isn't needed as it's already a voracious grower. However, a liquid 10-10-10 diluted to half strength or a cactus fertilizer once a month during spring and summer can benefit the plant. Exposure: They prefer a very bright situation and in winter they need the maximum amount of light you are able to give them, but keep more cool and partially shaded in summer. Outdoor they prefer full sun, with some shade in the hottest summer months. Plants in pots prefer light afternoon shade in hottest summer days.