Green in Islam

The color green (Arabic: أخضر‎‎) has a number of traditional associations in Islam. In the Quran, it is associated with paradise. In the 12th century, green was chosen as dynastic color by the (Shiite) Fatimids, in contrast to the black used by the (Sunnite) Abbasids. After the Fatimid dynastic color, green remains particularly popular in Shi'ite iconography, but it is also widely used in by Sunni states, notably in the flag of Saudi Arabia.

Reclining on green Cushions and rich Carpets of beauty

Upon them will be green garments of fine silk and heavy brocade, and they will be adorned with bracelets of silver; and their Lord will give to them to drink of a Water Pure and Holy.

Al-Khidr ("The Green One") is a Qur’anic figure who met and traveled with Moses.

The Green Dome, traditional site of the tomb of Muhammad, was painted green on the order of sultan Abdul Hamid II (r. 1876–1909).

Green was used as the color of the banners of the historical Fatimid Caliphate. The Fatimid banner was in use until 1171, and thus during the first century of the crusades, and by this way has taken influence on Christian heraldry, where the tincture vert was very rarely if ever used for the field (background) until the end of the Middle Ages (indeed the term sinople used to signify a reddish color until the 14th century, and only after ca. 1400 did it change its meaning to refer to green as a heraldic tincture).

...
Wikipedia