The transpiration of Tamarillos (Cyphomandra betacea (Cav.), Sendt.) grown in a sheltered orchard was measured periodically through a season. A series of excision experiments provided daily water uptake data which agreed closely with rates calculated on the basis of equilibrium transpiration and projected canopy area. Comparative porometer and leaf water potential measurements indicated that the excised trees functioned normally over the measurement periods. Shelter apparently reduced the influence of advection on evaporation with the result that transpiration was strongly dependent on net radiation.