Brambles of Mordor
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The large plateau in the northwest of Mordor was known as Gorgoroth, where the furnace and forge of the Ring lord Sauron were held. It was bragged that nothing grew in this poisoned land. The vast desolation of Gorgoroth was usually what was conjured up in the popular conception of "Mordor", though to the south and east of Gorgoroth plateau lay the more fertile lands of Nurn which contained vast slave-tilled fields. Still, Gorgoroth was the centre of Sauron's dominion and commonly considered to be a lifeless hell-on-earth.
However, the Red Book of Westmarch says that the region was actually not utterly devoid of flora. There were some plants that did grow in northern Mordor: running parallel to the outer Ephel Duath and the Gorgoroth plateau there was a smaller inner range of mountains called the Morgai. In the valley between the two mountain ranges, there was enough shelter and runnoff water for some plantlife and a basic ecosystem to survive. It was a dying land, as thousands of years of Sauron's supernatural devastation caused by the fires of Mount Doom had worn down what had originally grown there, but it was not quite dead yet.
In sheltered places twisted tree-forms and stunted grey grasses grew. The leaves were shrivelled with Sulphur vapour and maggot hatchlings. The only plantlife that seemed to maintain more than a tenuous foothold were the widespread brambles.
Nowhere in Middle-earth did brambles ever grow so large and fierce. These Brambles of Mordor were ugly with foot-long thorns, which were sharp as the knives of the orcs that came from Mordor. Some of the thorns were long and sharp, meaning that they could puncture very deeply, while others were barbed, making them suited for rending the flesh if one tried to walk through them. They sprawled over the land like coils of steel wire. They were truly the flowers of Mordor, for thy represented Mordor exactly; cruel, fierce, and disgusting. As Sam Gamgee remarked, he hadn't thought that any plants actually grew in Mordor, though had he been told that some do, the brambles were exactly what he would have expected of Mordor.