What is Vanilla ?

The growing and harvesting of vanilla was unable to be commercialized until the 19th century due to the delicate nature of pollination. The bean is actually the fruit of a celadon-colored orchid, the only one out of 20,000 orchid varieties that bears anything edible!
When the orchid blooms in nature (which only happens one day a year), the flower must be pollinated by a very specific species of bee or hummingbird to bear any fruit. The primary producers of vanilla beans are tropical areas: Madagascar, Uganda, Indonesia, Papua New Guinea.
It wasn’t until the 19th century that botanists found the only way to effectively produce vanilla beans in mass quantities was to hand pollinate every single flower! After pollination, it takes about 6 weeks to reach full size (up to 12 inches in length), and then another 8-9 months after that to mature. But wait – the process is still not complete!
After the pod reaches maturity, it is actually still green and must be hand-picked and set aside for curing. Curing consists of a three to six month process that begins with a short bath in boiling water, followed by sun heating. During the day, the beans are set in the sun to heat up, and then wrapped in blankets at night to sweat. This process can last up to 6 months, until the beans become dark brown and develop the aromatic smell we all know and love. The beans are then aged up to two years to bring out their full flavor. So, from pollination to maturity, this has the potential to be over a 3.5 year process! 
This is why Vanilla is the second most expensive spice in the world, Saffron being the first.
Grade ‘A’ vanilla beans (also called gourmet or prime). These beans are oily and moist. There are about 100 to 120 grade ‘A’ beans (6-7 inch) per pound (7.5 per oz). This vanilla is visually attractive so it can be a feature ingredient in gourmet cuisine. 30% – 35% moisture content.
Grade ‘B’ vanilla beans (also called extract beans). This vanilla is less moist and less attractive. But don’t worry, because the flavor isn’t in the water. There are about 140 to 160 grade ‘B’ beans (6-7 inch) per pound (10 per oz). 15% – 25% moisture content.