While girdling or paclobutrazol treatment could individually induce precocious flowering in Hevea brasiliensis, a combination of both treatments gave rise to an enhanced effect. The supplementation of high nitrogen fertiliser to these treatments did not increase precocious flowering. Compared with the Wickham clones, clones from the 1981 Germplasm collection showed a recalcitrance to flower-induction probably because of their state of juvenility. Induced male flowers could be successfully used for hand-pollination, whereas induced female flowere tended to give poor fruit-set. Palcobutrazol treatment had a side-effect in causing bark burst (splitting and flaking of the bark) in some of the Germplasm plants although this was rarely observed among the Wickham clones. Repeated girdling was observed to have a protective effect against bark burst.