Then why are there quotes in his journals about needing to separate the male and female plants?
Please cite the basis for your statement that "Washington grew only hemp"
What makes you certain he did not smoke?
You are missing the point. Obviously. Your avatar suggests that George Washington grew Cannabis for the purposes of cultivating Cannabis sativa or Cannabis indica, most commonly known as marihuana, marijuana or "weed". And your comment then continues with that suggestion.
When in fact, he and Thomas Jefferson grew what is likely known to be a cannabis ruderalus, a cannabis plant that produces very little THC and is cultivated for its fiber, oil and resin.
They were in business of producing paper products and fiber materials for making rope and clothing.
Here would be the first link that pops up for me, but there are many more if you do the research yourself.
http://www.straightdope.com/columns/read/2912/did-george-washington-and-thomas-jefferson-grow-marijuana
Let me ask you then "Einstein", what makes you certain he
did smoke?
You will notice, when I state some sort of fact, as I did earlier, I am right, or the preponderance of evidence to the fact is substantial.