This is my humorous explantion as to why no seedling of the White Tree could be found. I hope you enjoy.
The white squirrel crouched under one of the decorative bushes in the garden. He had grown up in the area of this big, stone city and knew every inch of it. The white male considered said garden — and several miles of land around the city — as his territory.
All of the garden was changed, however. The Tree — a beautiful white plant with silky bark — was draped in black. No birds chirped; no insects hummed; all was held in dead silence.
As the wind drifted in front of him it carried a sweet smell with it. It reminded him of the way clover smelled after a heavy rain. There, the squirrel saw, high up in the Tree was a silver nut.
Moved by a sudden impulse he crept out from under the bush where he had been hiding. After checking to make sure all the safe, the white male skittered over to the Tree. Pausing at the base, he looked up. The black drapes looked just like arms waiting to grab him…but the sweet smell was far too tempting.
Carefully he began to climb — trying to avoid being "grabbed" by the black drapes. Upon finally reaching the top of the Tree, the white male grabbed the nut between his paws and began gnawing through the stem.
It came loose easily, and soon the squirrel was scampering down the Tree. Quickly he left the stone-walled garden and made for the slopes of the mountains.
~o~o~
Creeping around a large boulder the white squirrel came to his favourite place to bury nuts. It was a narrow valley that led to a small, secret glade. The glade itself was covered with lush grass and a few scattered fir trees.
But the male squirrel was particular about where he buried his nuts…and this hidden glade did not feel like the right place to hide his treasure. So he climbed higher into the mountains, following a staircase carved into the rock.
Arriving at the top of the stairs, he looked around. The ground was rocky, save for a small patch of rich soil sheltered by a bend of stone.
The white male scampered over the bend and onto the rich soil. It was just right. He dug a shallow hole, covering the silver nut, and left.
For a few moments all was quiet. Then something moved in the trees, and a tall woman dressed in green stepped out. She knelt down where the silver nut had been buried.
'Lornúra' she whispered. Gently she brushed her hands over the mound of dirt — under which the nut was buried — then stood up and left the glade.
See if y'all can guess who the 'lady dressed in green' is.
*Note: Lornúra is a combination of two Quenya words. (I hope that helps you figure out who she is.)