In cannabis culture, the word Heirloom is used to refer to pure cannabis seeds, flowers, or plants that have been in existence for generations without being crossed with other strains.
When used to describe a strain of cannabis, the term inheritance means the same as it means when applied to now-rarely-grown vegetables and fruits. However, as cannabis has not had the same widespread culture as other plants, there are fewer heritage strains.
Heirloom is usually grown in isolated communities. These small areas offer to the cannabis producer a unique ability, trend, flavor, or other adaptation to local growing conditions.
Today, most varieties are not heritage but as an alternative, they are crosses that integrate the features of different strains to achieve a specific goal like higher levels of terpenes, THC, cannabidiol, or other.