Antioxidant activity evaluated by (A) 2,2-diphenyl-1- picrylhydrazyl (DPPH), (B) 2,2-azino-bis (3-ethylbenzothiazoline-6-sulfonic acid) (ABTS), (C) ferric reducing antioxidant power (FRAP), and (D) oxygen radical absorbance capacity (ORAC) methods of the extracts from in vitro cultures and micropropagated plants of Lavandula viridis and Thymus lotocephalus exposed to different temperatures (15, 20, 25, and 30 °C). For each species, the results were analyzed by one-way analysis of variance (ANOVA) and the graph bars followed by different letters (a–f) are significantly different at p < 0.05 (Duncan’s New Multiple Range Test).