Grandpa Baby (Purple Urkle 103 x Granddaddy Purple) is Purple Urkle crossed to Granddaddy Purple. Purple Urkle is a Mendocino Purps selection pulled out of the Emerald Triangle around 1990. Granddaddy Purple is the other California purple benchmark. Between them they cover ground neither reaches alone. Every parent CSI use is a cut they keep alive themselves, so nothing in this pack is a reconstruction of a famous name.
The number in Purple Urkle 103 is a specific plant, not a decoration. Humboldt CSI grow a population out, keep the individuals worth keeping and number them, so Purple Urkle 103 is one identified selection rather than Purple Urkle in general. A pack naming a different number is a different mother.
Purple Urkle sits on the seed side here, Granddaddy Purple on the pollen side. If you have seen these two names paired the other way round, that is a different pack and not this one.
Genetic Lineage
- Mother: Purple Urkle. A Mendocino Purps selection pulled out of the Emerald Triangle around 1990. Dense purple flower in a closed canopy is where mould starts.
- Father: Granddaddy Purple. The other California purple benchmark. Given as contested - its breeder gives Mendo Purps, Skunk and Afghan, while many sources give Purple Urkle x Big Bud. The lineage argument is the interesting part: the breeder's own account gives Mendo Purps, Skunk and Afghan, while most third-party listings give Purple Urkle crossed to Big Bud. Those are different plants and no source reconciles them.
- The point of the pairing. Neither parent needed rescuing. Putting them together is about what sits between them, not about fixing either one.
Flavor and Aroma Profile
Two profiles that stay distinguishable rather than collapsing into one.
- The Aroma. Sweet grape and dark berry over earthy skunk, myrcene-dominant from the Purple Urkle side, against grape and berry over earth from the Granddaddy Purple side.
- The Taste. Grape and berry turning earthy and musky up front, turning to sweet grape with a berry finish through the exhale.
How the two sides differ
- Two different harvest dates. Around eight weeks indoors, inside a seven to nine week window for Purple Urkle, around eight weeks for Granddaddy Purple. Judge each plant on trichomes rather than pulling the room together.
- Two noses, one pack. Purple Urkle contributes sweet grape and dark berry over earthy skunk, myrcene-dominant. Granddaddy Purple contributes sweet, fruity and floral over an earthy base. Which dominates is the main thing that varies.
- Build. On the Purple Urkle side: compact and indica-built; deep purple colour hardest where night temperatures drop late. On the Granddaddy Purple side: indica-built, heavy colour. Select early rather than trying to train your way out of it.
- They pull differently. Growers put Purple Urkle at settled and unhurried; the heavy, physical end and Granddaddy Purple at settled and heavy. Which end a plant lands on is the main variable.
Cultivation and Growth Traits
- Plant Structure. The two parents disagree here, so plan for range. Purple Urkle is compact and indica-built; deep purple colour hardest where night temperatures drop late. Granddaddy Purple is dense and heavily coloured, indica in build.
- Vegetative Phase and Stretch. Shape the plant before the flip. Correcting a frame in week six is harder work than setting it in week two.
- Flowering Time. The parents are not on the same clock. Purple Urkle runs around eight weeks indoors, inside a seven to nine week window, Granddaddy Purple around eight weeks. Judge each plant on trichomes rather than pulling the room together.
Effects and Experience
- The Mind. Growers describe Purple Urkle as settled and unhurried; the heavy, physical end.
- The Body. Granddaddy Purple is reported as settled and heavy, and that is the side supplying the weight here.
In the pack
7 feminized seeds per pack. Feminized seeds from Humboldt CSI. What they sell is preservation work: old clones reversed into seed so the line survives past whoever is currently keeping it alive. Original Humboldt CSI stock.
Grandpa Baby (Purple Urkle 103 x Granddaddy Purple) – Humboldt CSI
- Brands CSI Humboldt
- Product Code: 010122375145
- Availability: 1
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$150.00
Tags: cannabis seeds, feminized seeds, Humboldt CSI, CSI Humboldt, Purple Urkle, Granddaddy Purple, strain guide

