Rebutia fiebrigii is a small solitary or mound-forming cactus preading out to 15 cm with white, silky, short spines and light green tubercles thickly covering the body. It is a free-flowering species with bright vermilion blooms, but quite variable. Nowadays, under the name of Rebutia fiebrigii, botanists include several different forms, that were previously regarded as independent species
Fertilization: Feed with a high potassium fertilizer in summer. Hardiness: It is reputedly resistant to frost if kept on the dry side prior to, and during, cold weather and requires a winter rest period (hardy to -7° C, or less for short periods). Rebutias grow in nature at high altitudes and do not thrive well at high temperatures in cultivation. They will often go dormant in mid-summer and resume growth again when the weather cools in late August. They can tolerate amazingly low temperatures for long periods of time. All species can take a frost, even when not bone dry. It is generally accepted that plants kept at too high a temperature, or watered too much during the winter rest period, will not bloom the following year. They will be perfectly happy in pots outdoors from April to September if protected from torrential rain and hail. The plant tolerates extremely bright situations but enjoys filtered sunlight or afternoon shade, inside it needs bright light, and some direct sun. Tends to bronze in strong light, which encourages flowering and heavy spine production, but is likely to suffer from sun scorch or stunted growth if overexposed to direct sunlight during the hottest part of the day in summer. Uses: It is a fine plant for a rock garden or container, contrasts well with agaves, yuccas, and low-growing flowering plants. This variety is also likely to flower as a houseplant, but results will depend on a variety of growing conditions.