If the unglossed headword phrase is a two-word quotation -- rather than 'green' glossed as '(a) color' -- it occurs twice in this precise form in a work closely contemporary with the Suda, the C10 Chronographia of Theophanes Continuatus, and it refers there to the Green (literally Leek-Green: cf. pi 2226) faction in C6 Byzantium. (Both Justinian and his wife Theodora supported their opponents, the Blues.) However, note also e.g. Plato, Timaeus 68C (later quoted by Stobaeus), where prasion features in a long discussion of colors.
[2] An approximation of Procopius, Secret History 19.11 (web address 1); read e.g. *prasi/nou for the Suda's *prasi/ou; cf. Kaldellis (88). On the Blue and Green factions, see alpha 3460. On Justinian see iota 446 generally.