It surprises many people new to tea to learn that green tea and black tea originate from the same exact plant species — Camellia sinensis, and just processed in different ways. Black tea is allowed to oxidize, while green tea is heat treated faster after picking.
Not all green teas taste the same, even though it all comes from the same plant variety. Processing, farming, picking and even the surrounding crops may affect the flavour of the end product.
Typically, green teas are brewed in a short time at around 60 to 80 degrees. Green tea should be steeped from 30-60 seconds for the more delicate teas and from 2 to 3 minutes for regular teas.