Just like green tea, all peppercorns come from the same plant, in this case Piper nigrum. Although it may take several years for this flowering vine to produce berries, or peppercorns, it usually continues to do for several decades.
Peppercorns vary in color because they are harvested and/or processed differently. Green peppercorns, for instance, are picked when slightly under-ripe, red peppercorns are harvested just as they reach maturity on the vine and black peppercorns get their color from basking in the sun for several days. However, when blending mixed peppercorn spice, pink peppercorn (Schinus terebinthifolius) is used for color versus the ripened red Piper nigrum.
Please note: Pink peppercorn can cause an allergic reaction in people with nut allergies.