Myrtillocactus geometrizans (Blue Candle) Cactus Seeds (100 Seeds). If you are looking for a fast-growing cactus that can be the focal point of your indoor or outdoor garden, you should put the Myrtillocactus Geometrizans at the top of your list. This succulent is quite massive, and it has a very interesting shape when it reaches maturity. Myrtillocactus Geometrizans goes by many names including Blue Flame, Blue Candle, Bilberry Cactus, or Blue Myrtle Cactus. Unlike most succulents which take years to grow, this cactus is quite a fast grower and in proper conditions, it will reach maturity with minimum effort on your part.