In Qu#xE9;bec, 83 first-generation seed orchards destined to produce seeds from genetically improved trees have been established since 1973. Consequently, the Tree Genetic Improvement Program uses a very large quantity of pollen in order to carry out the controlled pollination projects in those seed orchards. Moreover, controlled pollination is carried out within a very short time-frame and very often the receptivity period occurs before the time of pollen dispersion. It is for these reasons that the pollen bank was created in Qu#xE9;bec. This manuscript summarize the process of long term preservation of a large quantity of tree pollen. It is possible to preserve the pollen of coniferous trees on a large scale for up to five years. It is more difficult to manipulate the pollen of deciduous trees.
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