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A study was conducted to characterize the morphological and physiological responses of four herbaceous perennial species subjected to two subsequent drought cycles. Lantana camara L. 'New Gold' (lantana), Lobelia car- dinalis L. (cardinal fl ower), Salvia farinacea Benth. 'Henry Duelberg' (mealy sage), and Scaevola aemula R. Br. 'New Wonder' (fan fl ower) were subjected to two consecutive 10-day drought cycles. Growth response, leaf gas exchange, and chlorophyll fl uorescence were measured during the experiment. The morphology of L. cardinalis and L. camara was not affected by drought, while S. farinacea had reductions in plant height and leaf area and S. aemula had reductions in dry weight. Overall, plant growth and development continued even when substrate water content was reduced to 0.13 mm 3 ·mm -3 , which indicated a level of substrate water below container capacity was suffi cient for greenhouse production of these species. The drought treatments had little effect on the photochemical effi ciency (Fv/Fm) of Photosystem II. An increase in minimal fl uorescence (Fo) was observed in S. aemula on the last day of the second cycle. Drought treatment caused increased leaf-level water use effi ciency (WUE) at the end of the fi rst cycle in L. cardinalis and S. aemula, but not in L. camara and S. farinacea. Plants of L. camara, S. farinacea, and S. aemula that had received drought during both cycles became more water use effi cient by the end of the second cycle, but L. cardinalis did not.

Growth, Gas Exchange, and Chlorophyll Fluorescence of Four Ornamental Herbaceous Perennials during Water Deficit Conditions