Grow in free-draining substrate near a window where it can receive plenty of light.
Mexican snowball is one of many echeverias you can grow in an open terrarium. Perfect for pairing with other succulents and cacti, Echeveria elegans has pale, green-blue foliage and will gradually spread to produce a small colony of rosettes. If happy it will send out attractive yellow flowers on long stems (you can trim these off if you'd prefer to focus your display on the foliage). Grow in free-draining substrate near a window where it can receive plenty of light. Water sparingly. For a particularly lovely display, seek out Echeveria ‘Blue Frills’.