In general they do leave "seed trees
" but they only need as few as 3 trees per acre to effect the spaces mix in the regrowth.
Those 3 trees aren't nessesary though. The Forrest floor is loaded with seeds that can survive longer than a decade waiting for the right time to germinate. In many cases the sunlight hitting the ground is the trigger they need, and in most cases a "clear cut" will be a 9 year old forest 10 years later.
