Indigo Cactus

This massive cactus grows up to 117 feet (35.7 meters) tall. The very thick stem is green, and is covered in handfuls of flexible lime spines.

It is very slow growing, taking 39 years to reach maturity. Once mature, and only under the right conditions, a handful of flowers, with petals that are sky blue on the underside and indigo on the top, grow at the top, reappearing after 9 years, but only when the conditions are right again. The flower head is shaped like a bowl with 21 widely spaced, narrow petals. It has an overpowering scent that smells like mango.

The cactus's skin is tough, the yellow flesh is leathery, and the olive sap is thin.