p.s. to selloum
ISTA is the International Seed Testing Authority (well, I didn't know).
Another question: the philodendron that we (Florida) have as 'Xanadu." Is
it a cultivar of P. bipinnatifidum hence P. bipinnatifidum 'Xanadu' or a
hybrid (Philodendron 'Xanadu')? I know that Philodendron 'Xanadu' is
acceptable in either case, but I like to use the form that tells as much as I