How to grow Granddaddy Purple
THC 19% 
Flowering 56 - 70 days 
Yield 397 – 549 g/m² 
Height 119.9cm Taste
Seb's take
Purple Urkel and Big Bud, backcrossed with ruderalis, make up this compact, hardy autoflower at a modest 16-19% THC. Sweet, floral and berry on the nose; the effect is focused and happy before settling into calm relaxation — classic purple-line character, delivered without a light-cycle to manage.
Where it comes from
The autoflowering version of the Californian classic, this pairs Purple Urkel and Big Bud with a ruderalis backcross for speed. The purple-line character survives the conversion intact — the sweetness, the colour, the resin — while the ruderalis frees it from any light-cycle scheduling. At 80/20 it leans firmly indica. A dependable everyday take on a celebrated name.
Nose & flavour
Sweet leads, with floral and berry notes rounding it out — the classic purple-line profile, soft and fruit-forward. The record highlights resin-covered buds, and the aroma carries that sticky sweetness. Pleasant and undemanding on the nose, much like the plant itself.
The high
Focused and happy to start, with just enough mental clarity to keep the experience present, before it eases into calm relaxation. At a modest 16 to 19% THC this is the gentler end of the family — a mellow, feel-good high rather than a heavy one. Good company that leaves you your faculties.
Growing it
Autoflowering, medium at roughly 120cm. Flowering runs 56 to 70 days from seed, with yields of around 400 to 550 g/m². CBD sits at 1%. The record has it compact, robust, moderately easy and hardy — a forgiving grow that suits anyone after dependable results without the scheduling. Classic purple character, minus the fuss.
Learn to grow her properly:
Effects
Granddaddy Purple from other breeders
The same name, several hands. Every breeder’s version below is its own cut — different figures, different temperament, same family. The particulars above describe the lead listing.
- Royal Queen Seeds feminized Seeds at Herbies →
The photoperiod version, feminized.
- Growers Choice feminized Seeds at Herbies →
The photoperiod version, feminized, finishes ahead of schedule (~55 days, not ~63).
Common questions about Granddaddy Purple
How long does Granddaddy Purple take to flower?
Around 9 weeks of flowering, by the breeder's numbers.
Is Granddaddy Purple an autoflower or a photoperiod strain?
An autoflower — she flowers on age rather than light hours, which simplifies the schedule considerably.
How tall does Granddaddy Purple grow?
Around 120 cm. Standard tent territory.
How strong is Granddaddy Purple?
The breeder lists THC around 19%. Firmly in the strong band.
