I have cloned a clone from a clone as early as 17 days old... It was from an 'of age' clone with calyx... now, I clone almost every day... how are your clone skills? If you wait until the plant is say 10 nodes [5 opposite nodes spaced] I would say still too small... I like 2-3 nodes above medium... and two or more under medium... I am cloning to have more female plants.... at first you would be cloning just to show your plants sex? Good Luck man... If you wait for 10 nodes, you could "Top" it, and clone top...