[1] In later years contributions towards setting up or improving hospitals, clinics, universities and schools in Mainland China and Hong Kong were made in the name of Wu or his father.
Some 10,000 copies were donated to leading libraries, universities, and bonsai lovers all over the world to commemorate Wu's retirement from the chairmanship of Wing Lung Bank.
(In the 1970s Wu had offered the U.S. fifty of his penjing on the condition that the usual importation procedure of bare-rooting and fumigation be forgone, as this would have been fatal to these very old trees.
After a few years of negotiation, the Department of Agriculture and Agri-Food Canada did issue a special phytosanitary certificate for Wu's trees, although two of his Japanese black pines could not be imported.
Wu instructed his son Norman Po-Man (one of thirteen children) to take color photographs and publish a hardcover souvenir volume; this comprehensive collection of penjing in full color called Man Lung Penjing was published in 2002, covering over seventy years of study and is a record of Wu's creative style.