It is the tiniest of the Echinocereus species, and one of the smallest cacti in the world.
Flower: yellow-green or straw-yellow, weakly lemon-scented.
Blooming season: Blossoming and fruiting occur on 3 to 4-year-old plants. Blooming period in cultivation is March-April and the flowering period usually lasts 10-20 days (but this period must be expanded under favorable growing conditions. The flowers open in the morning till afternoon and again for 3-4 days after closing at night.
Watering: Water sparingly from March till October, and keep perfectly dry in winter, at temperatures from 5 to 15 degrees centigrade. In the rest period no high atmospheric humidity!! Care must be taken with watering as they tend to become swollen and untidy in growth habit if given too much water and shade.
Exposition: Outside bright sun, filtered sunlight or afternoon shade, inside it needs bright light, and some direct sun. Subject to sunburn if exposed to direct sun for too long. Tends to bronze in strong light, which encourages flowering and heavy spine production.
Hardiness: Keep drier and cool in winter. Very cold resistant hardy to -10° C or less for short periods of time.
Some of the information in this description has been found at desert-tropicals.com, llifle.com and cactus-art.biz
