Al-A'laa • EN-TAFSIR-IBN-ABBAS
﴿ فَجَعَلَهُۥ غُثَآءً أَحْوَىٰ ﴾
“and thereupon causes it to decay into rust-brown stubble!”
(Then turneth it) after being green (to russet stubble) i.e. He makes it dry and black when it exceeds a year.