A comparative trial with 16 different peach rootstocks grafted with 'Catherine' was planted in February 1985 to investigate the behavior of new Spanish and foreign sélections, the most interesting commercial peach rootstocks and the self-rooted variety. The rootstocks used were: Plums: 'Brompton', 'Constanti', 'Damas 1869', 'GF 43', 'Monpol 645', 'Montizo 646', 'Puebla de Soto 101', 'San Julián A' and 'San Julián 655/2'. Peaches: 'Commercial Seedling', 'GF 305', 'Siberian C', and 'Self-rooted Catherine'. Almond x Peach hybrids: 'Adafuel', 'Arbucias' and GF 677'. The trial was planted in a flood irrigated plot in a silt-loam soil, low active lime and low fertility. 'Constanti ' and 'San Julián A' rootstocks were eliminated in the study due to the waterlogging mortality of 4 trees each. 'Adafuel' showed the highest vigor with 66 cm of trunk girth, followed by 'GF 677' with 62 cm. Vigor of 'Siberian C' and 'Commercial Seedling' with 51 cm of trunk girth was similar to plums. After 8 crops, the highest accumulated yield was obtained on 'GF 677' with 411 kg/tree followed by 'Adafuel' with 405 kg/tree. The lowest yields were obtained on 'Brompton' and 'Puebla de Soto 101' with 219 and 214 kg/tree respectively. The best productivity (cumulative yield/trunk cross-sectional área) was obtained on 'Commercial Seedling' (1.42 kg/cm2) followed by 'Siberian C' (1.40 kg/cm2) and 'GF 677' (1.37 kg/cm2). The lowest productivity was obtained on 'GF 43' (0.96 kg/cm2). Among the plum rootstocks, ‘Montizo’ showed the best performance (1.20 kg/cm2). We can conclude that, regarding the calculated productivity, 'Catherine' can be successfully cultivated on its own roots. In the soil conditions of the trial the most demanding rootstocks (plums) were handicaped and consequently the best adaptation was obtained with peaches jointly with the almond x peach hybrids.