"Button Cactus", although it is cold-hardy, can't be grown indoors. Echinocactus grusonii Golden Barrel Cactus can be propagated using seeds. If you live in a zone higher than 9a, you can sow Cephalocereus seeds outside. If you live in a cooler region, you can start sowing indoors using a grow light or a mat. The height of the highest plant should be at least six inches. An underwatered jelly bean plant will have shriveled up, dried leaves starting from the bottom of the plant. It usually produces purple-red blossoms. However, growers have reported pink and orange blossoms.