THALLO was the Hora (season) goddess of spring buds and shoots. She was worshipped in Athens alongside the goddess Pandrosos ("All Dew").
Thallo was probably identified with the Hora Eirene, whom Hesiod titles thallô in his Theogony.
THALLO (Thallô), one of the Attic Horae, who was believed to grant prosperity to the young shoots of plants, and was also invoked in the political oath which the citizens of Athens had to take. (Paus. ix. 35. § 1; Pollux, Onom. viii. 106.)
Source: Dictionary of Greek and Roman Biography and Mythology.
Pausanias, Description of Greece 9. 35. 2 (trans. Jones) (Greek travelogue C2nd A.D.) :
"The Athenians from of old have worshipped two Kharites (Graces), Auxo (Growth) and Hegemone (Queen). [The third] Karpo is the name, not of a Kharis, but of a Hora. The other Hora is worshipped together with Pandrosos (All Dewy) by the Athenians, who call the goddess Thallo (Green Shoots)."
Pseudo-Hyginus, Fabulae 183 (trans. Grant) (Roman mythographer C2nd A.D.) :
"The names of the Horae . . . Auxo (Growth), Eunomia (Order), Pherusa (Substance), Carpo (Fruit), Dice (Justice), Euporia (Abundance), Irene (Peace), Orthosie (Prosperity), Thallo (Green-shoots)." [N.B. These appear to be three distinct sets of three Horai.]
- Pausanias, Description Greece - Greek Travelogue C2nd A.D.
- Hyginus, Fabulae - Latin Mythography C2nd A.D.
Other references not currently quoted here: Pollux 8.106