Eight pollen collectors of the Tauber type are exposed continuously in a mixed deciduous forest in South Jutland, Denmark. The results from 1967–1972 are reported. Exotic pollen carried over the forest from the outside vegetation was collected uniformly by the various collectors. The pollen was deposited mainly during the flowering seasons, but postseasonal deposition continued throughout the year. A dust storm deposited considerable amounts of pollen. Night frost caused aberrantAlnus-pollen deposition in one year. The trees in the forest flowered abundantly every second year.Tiliawas out of phase with the other trees, andFraxinusflowered abundantly only 1969. The local trees flowered particularly well in 1969 and nearly all other plants in 1968 and 1969. The weather in April was particularly warm and dry in these 2 years and may have stimulated the pollen production. The tree pollen productivity was calculated and compared with the results obtained for a previous period from moss samples.