Micron Grading

Micron grading is a standardization system used to classify cannabis trichomes and plant material by particle size, typically measured in microns (micrometers). This classification emerged from bubble hash and solventless extraction communities, where trichome head diameter directly correlates with extract quality and potency. Micron grades range from full-melt (73-120 microns) down to plant material contamination thresholds, providing breeders and extractors with objective criteria for evaluating resin production. Understanding micron grades helps geneticists identify plants with larger, more abundant trichome heads—a heritable trait. Different cannabis families produce trichomes at varying sizes; some genetics consistently yield larger heads suitable for premium micron-grade extraction.

Breeders working in solventless extraction genetics use micron grading as a measurable selection criterion. By tracking which parent plants produce offspring with trichome heads that grade highest in micron ranges, breeders develop lines optimized for full-melt or premium-tier extracts.