The Nirvana Haze #13 feminised seed traces its origins back to the 1970s in the Bay Area of San Francisco where it was first bred.
It is a combination of Colombian, Mexican, Thai, and Jamaican genetics, resulting in a mostly Sativa strain with a TCH content of over 15% which means that it is useful for medicinal purposes.
This long-flowering strain is unique as it produces fluffy buds which are characteristic of this plant and as well as this it gives off a beautiful array of smells unmatched by any other plant.
It is primarily meant to be grown indoors and only the warmest outdoor climates resulting in a yield of 250-350 g/m2 and a flowering period of 12-14 weeks.
Haze #13 are feminised which means that the strain has been genetically cultivated to produce only female seeds. Some people prefer unaltered seeds for fear of this manipulation, however feminised seeds have several positive attributes which far outweigh any supposed downsides.
When regular seeds are grown they will roughly produce an even split between males and females, although sometimes this can favour slightly towards the females.
However, unless a grower is looking to breed their own crop, only the females are useful as these are the ones which need to be cultivated. Consequently, male seeds take up space and time, which would be better served on the females.
Space is especially essential for Haze #13 as it is a rather tall growing plant. Even if a grower was looking to breed their own crop the feminised seeds can be manipulated in such a way that they will produce the pollen necessary for reproduction.
If this is achieved future crops are certain to be more genetically uniform than if both male and females were used. However, this is an extremely tricky process and should only be attempted by the more experienced growers.