The species is closely associated with Acacia raddiana, is only found in valleys which also support a growth of trees. The grass is generally limited to the bed of the watercourse that becomes wet following the infrequent rains. The tufts of Panicum grass remain dormant in a totally dry state, and immediately turn green once moistened, as noted in Karkur Talh following the rains of 2005. In a few sheltered areas of Karkur Talh fresh growth was noted even in dry periods. The species also grows in the vicinity of springs in Karkur Murr, where it is in a perpetually green state. One green tuft was noted in the main valley on the Hassanein Plateau (in close vicinity to Acacia trees), the sole observation outside the main watercourses.

Characteristic dry wadi vegetation with tufts of Panicum turgidum among green Acacia raddiana in middle Karkur Talh

Green shoots within generally dry tufts of Panicum turgidum in middle Karkur Talh, November 2004

Dry tufts of Panicum turgidum among Maerua crassifolia in upper south western branch of Karkur Talh

Panicum / Acacia vegetation in middle Wadi Abd el Melik		Panicum turgidum is the dominant vegetation in upper Wadi Abd el Melik		Panicum / Acacia vegetation in upper Wadi Hamra

Perennially green Panicum turgidum near the spring in the eastern branch of Karkur Murr (Jebel Uweinat)

Green and flowering tufts of Panicum turgidum in the bed of the watercourse in middle Karkur Talh (Jebel Uweinat), in the area dominated by Tribulus pentandrus and Cassia italica, 18th October, 2005

Tribulus pentandrus among tufts of Panicum turgidum in the central part of Karkur Talh (Jebel Uweinat), 18th October, 2005

Lower Karkur Talh (Jebel Uweinat), October 2006, at and below end of 2005 runoff, intermingled with Citrullus colocynthis and Crotalaria thebaica.

Green tuft of Panicum turgidum in the main valley of the Hassanein Plateau (Jebel Uweinat), October 2006				Green tufts of Panicum turgidum near Ain Murr, Karkur Murr, October 2006

Middle Karkur Talh (Jebel Uweinat), March 2007