Fig. 1

Average (± SD, n = 3) predawn leaf water potential relative to watering regime per species (all sessions together). a Pteridium aquilinum; b Molinia caerulea; c Rubus sect. Fruticosi; d Calluna vulgaris, and per session for all species e S1, f S2, g S3 under 20 % radiation (grey) and 70 % radiation (black)