Board Thread:Dark Souls II/@comment-99.233.184.171-20140314012301/@comment-5181294-20140325180007

I found one at the Giant Corpse near the Soldier's Rest bonfire in Forest of Fallen Giants.

(When you click the Giant, it says "A giant rests in peace...")

I didn't find the seed until I had the Ashen Mist Heart, but it may be there anyways. It is growing on his left hand, I believe.

Hope this helps.