Was on the short list of artists invited to perform at the Monterey Pop Festival. Unfortunately, he couldn't due to a drug indictment hanging over his head in Britain.
Fathered two children with Enid Graddis (a.k.a. Enid Stulberger): Donovan Leitch Jr. and Ione Skye. His song "Bleak City Woman" was about his meeting Enid, and choosing to romance her.
His song "Laleña" was covered by Deep Purple on their self-titled 1969 third album. They described their arrangement as "Donovan's song the way we thought Donovan would like to have heard it.".
Son-in-law of Violet & Alec Lawrence.
When his song "Mellow Yellow" was first released, it was thought that the song was about smoking dried banana peels. It was eventually revealed that the song was about a vibrator.