Process for purifying glandular trichomes

A dry process for isolating clean glandular trichomes from a trichome bearing plant material, comprising the steps of:

• a) Freezing a crude trichome powder, comprising said glandular trichomes and vegetable contaminants, at a temperature equal or below −20° C.,
• b) Treating said frozen trichome powder by a mechanical operation to shatter the large contaminants into fine dust, while preserving the glandular trichomes to be purified,
• c) Sifting said crude trichome powder to separate the fine dust contaminants from the glandular trichomes to be purified,
• d) Recovering said purified glandular trichomes.