What I didn't know about it - and felt pretty stupid because I never noticed it before - is that the period of harvest is from April to June. Although I knew it was during our Autumn season (here in the Southern Hemisphere is from March 20 until June 20 or 21), I never took the trouble of researching or inquiring anyone about the precise time.
I also learned that our Walnut Trees are not of the common type, but a species called Pecan Walnut (Carya illinoinensis), which produces smaller and browner nuts than the original Walnut Tree (this one produces those big, yellowish ones).
It is an originally North American and/or Mexican species, probably introduced in Brazil (where I live) in the early XX century.
What do you think about nuts? Are you so enthusiastic about them as I am? Tell me!