Fig. 4. Relationship between leaf stomatal conductance (g_l) and photosynthesis rate (P_n) levels at midday in dwarf sea-lavender (L. pectinatum) plants under control (P_n = 0.04g_l + 0.56; r² = 0.92, significant at the 0.001 probability level [***]), S1 (P_n = 0.03g_l + 1.19; r² = 0.95***), S2 (P_n = 0.04g_l + 0.005; r² = 0.95***), and S3 treatments (P_n = 0.05g_l - 0.13; r² = 0.86***) during the experimental period.