All teas, except herbal tea, comes from the same plant:
Camellia sinensis. The differences between black, oolong, green, etc., are in the handling and processing of the tea
after it's picked. All black teas, such as Assam, Kemun, Ceylon, Darjeeling, etc., come from this same plant, and the differences in flavors are caused by the nutrients in the regional soils where they are grown. 'Orange pekoe' is a grade of tea, rather than a type of tea.
My house is about a 45 minute ride from the tea gardens of Uji. Hillsides covered with tea bushes. Beautiful to see. Some of the finest Japanese green tea comes from these plantations. I can't drink the stuff...
I guess it's too high quality for me. In green teas, I prefer the low quality stuff unless I'm drinking tea served in a tea ceremony. My wife will kill for the high grade Uji teas though. She loves it. Not me... Pearls before swine, I guess.
On a motorcycle ride through the tea gardens I picked up some tea berries and planted them on my veranda. It just a small potted bush but once a year we can pick the new growth and make two cups of tea from it. Frankly... I prefer Fortnum & Mason.
Stitchawl