Grand Daddy Purple Banner Feminized Seeds

Grand Daddy Purple Banner is an indica-dominant feminized hybrid, about 70% indica and 30% sativa, that crosses Granddaddy Purple with Bruce Banner. Seed companies also sell it as Grand Daddy Banner, and its terpene mix is described as earthy, with sweet, floral and vanilla notes. Flavour Chasers lists THC at 20–24%. It is an easy grow that flowers in about 8 to 10 weeks.

History & lineage

This is a meeting of two well-known names. On one side is Granddaddy Purple, a California strain often said to be Purple Urkle × Big Bud, though its parentage is disputed. On the other is Bruce Banner, which Leafly credits to Dark Horse Genetics. Cannigma tells the story: Dark Horse founder Jason Holck crossed Strawberry Diesel with Cold Creek Kush, an OG Kush cut, and unveiled Bruce Banner at his Denver dispensary in 2008.

Flavour Chasers rates the cross about 70% indica and says it takes a lot of its character from the GDP parent, though it’s 50/50 whether you get a purple plant or a bright green one with orange hairs, and you may even get both. Granddaddy Purple, one of its parents, won Best US Indica Flower at the 2015 High Times US Cannabis Cup in Denver (Herbal Healing’s entry, listed as Granddaddy Purps).

Aroma & flavour

Expect an earthy base with sweet, floral and vanilla notes; that is the terpene mix the cross’s seed listings describe. Its parents are known for different profiles: Leafly describes Granddaddy Purple’s grape and berry aroma, and Bruce Banner’s diesel aroma with sweet undertones. Our guide to cannabis terpenes explains how those compounds build a smell.

Effects, as users report them

Leafly has no user reports for this cross, so the boxes show Leafly users’ reports for Granddaddy Purple, one of its two parents, most common first. Bruce Banner users most often report happy, euphoric and relaxed, and anxiety is among their downsides. Flavour Chasers calls this cross’s high happy and euphoric, and its seed listings describe a euphoric start with plenty of laughs and an appetite, easing into deep relaxation. A cross won’t always feel like either parent. Dry mouth and dry eyes are the downsides Granddaddy Purple users mention most. Effects vary with the person and the dose, so if you are new to cannabis, start low.

Growing Grand Daddy Purple Banner

Grand Daddy Purple Banner is a feminized photoperiod plant: it keeps growing leaves until the light drops to 12 hours a day indoors, or until the days shorten outdoors. Flavour Chasers gives 8 to 10 weeks of flowering, and outdoors it is harvested in October in the Northern Hemisphere. For how that fits a whole grow, see our seed-to-harvest timeline.

It is easy to cultivate indoors and outdoors. Expect indoor yields around 500–600 g/m² (about 1.6–2.0 oz/ft²) and more than 600 g (about 21 oz) per plant outdoors. Indoors, plan for a plant somewhere around 70–140 cm (2.3–4.6 ft), going by its parents. Expect some plants to finish purple and others bright green. Keep indoor relative humidity around 40–50% in late flower, and check that an October finish comes before your first autumn frost. Look at the trichomes to decide when to harvest.

Is Grand Daddy Purple Banner right for you?

Questions buyers ask