This style of tea is harvested, withered, and placed directly on the drying rack.
Oxidation takes place without any rolling or bruising of the leaf, so there’s no need for forceful fixing (or heating of the leaf) to halt the accelerated oxidation process.
As a point of reference for new tea drinkers, this type of tea is different from green tea because there is no fixing. In other words, white tea is picked from the tea plant (camellia sinensis) then placed on a rack to dry.
This process will take longer, too, because no bruising has occurred to accelerate the process.