  Photoevaporation driven by the ultraviolet radiation from massive stars
severely limits the lifetime of protoplanetary discs around stars formed within
stellar clusters. I investigate the resulting influence of clustered
environments on the probability of giant planet formation, and show that for
clusters as rich, or richer than, Orion, the time available for planet
formation is likely to be limited to the length of any delay between low mass
and high mass star formation. Under popular models for the formation of massive
planets, the fraction of stars with giant planets in rich clusters is expected
to be substantially suppressed as compared to less clustered star formation
environments.
