This type of cactus is best known as “golden ball” or “golden barrel”. It originates from Mexico. It’s shape is for the most part round, spherical actually, like a ball or a dome. The entire surface is covered in strong, large, yellow needles. This gives the cactus it’s golden glow.
It’s possible for yellow flowers to sprout on the top of the cactus. As most cacti the Echinocactus Grusonii requires lots of sunlight and water only when the soil is dry. You’re usually better off under-watering a cactus than over-watering. Over-watering can lead to root rot. You can feed your cactus with specially formulated cactus food, ask someone at your local garden center for help if you aren’t familiar with the products available to you.
This cactus can be grown from a seed in a greenhouse, but I suggest just paying for one that is already well on it’s way. You’ll get more enjoyment out of it and you won’t have to care for a seedling.