Some people take ginkgo biloba supplements to supplement their memories.  I don’t know if it works, but I never forget to marvel at the memory of my ginkgo tree:  it never forgets that it is supposed to turn yellow every October and not red like the Japanese maple.  And every spring, it remembers that its leaves are supposed to be fan-shaped.My bottle tree has memories too in the blue bottles friends and family have brought me from all sorts of places.