Purple Urkle vs. Grand Daddy Purple: Lineage, History, and Lab Results Compared

Purple Urkle and Grand Daddy Purple (also written Granddaddy Purple, or GDP) are two different cultivars. The most widely repeated account makes Purple Urkle one of GDP’s parents, crossed with Big Bud. That account is common, but it isn’t settled: Ken Estes, the breeder who brought GDP to market, has described its origin differently in two published interviews without naming Purple Urkle or Big Bud.

This guide covers where each name comes from, what the lineage records support, and how the two current batches compare on their COAs. If you’d rather start with the flower itself, the Purple Urkle and Grand Daddy Purple product pages list each batch’s lab report. For a closer look at Purple Urkle on its own, see our Purple Urkle strain review.

Purple Urkle vs. Grand Daddy Purple at a Glance

Both Purple Urkle and Grand Daddy Purple are classic, grape-forward, indica-dominant cultivars available in Black Tie’s Exotic collection. On the current batches, Grand Daddy Purple has the higher THCA result, at 29.73% against 26.79% for Purple Urkle. Purple Urkle’s Full Panel COA also measures its terpenes, showing a myrcene-led profile, while the current Grand Daddy Purple COA does not include a terpene analysis.

How Purple Urkle and Grand Daddy Purple Are Related

Purple Urkle as GDP’s parent is the most commonly reported account, not a documented one. Here is what each record says, and where the records disagree.

Purple Urkle: a Mendocino Purps selection with no documented breeder

Purple Urkle’s original breeder has not been reliably documented. Leafly’s strain record describes its origins as believed to stem from a selected phenotype of Mendocino Purps.

Breeder Todd McCormick gave Leafly a longer version of that family tree. He traced Mendocino Purps back to Purple Kush, a Hindu Kush and Afghan cross he attributes to Kenneth Morrow, and described Purple Urkle and Lavender as Mendocino Purps phenotypes, according to Leafly’s Purps family genealogy.

Not every database agrees on direction. AllBud notes a belief that Purple Urkle is a phenotype of Granddaddy Purple, the reverse of the usual parent-and-child order, before calling it most frequently a Mendocino Purps phenotype.

The name is widely understood to reference Steve Urkel, the Family Matters character.

Grand Daddy Purple: one breeder, several accounts

Ken Estes is the name consistently attached to GDP. He says he launched it in Oakland in 2003, and Leafly reports that Dark Heart Nursery acquired a GDP cutting attributed to him that year. The accounts of its parents are less consistent.

In the 2026 interview, Estes describes naming the plant Granddaddy Purple and then, over the next two years, tearing out his other strains to focus exclusively on the purple. In neither interview does Estes name Purple Urkle or Big Bud.

What the records support

The accounts agree that GDP is a Northern California purple cultivar that Estes brought to market in 2003. They disagree on its parents. The fairest summary is that Purple Urkle is the most commonly reported parent of GDP, and that GDP’s own breeder has not described it that way.

That kind of gap is common with legacy purples. McCormick told Leafly that inconsistent strain labeling makes origin stories within the cannabis community hard to take at face value.

The Current Batches, Compared

Both batches belong to Exotic, Black Tie’s highest flower tier, and both product pages list them as Exotic Indoor. Exotic flower is sourced from select cultivation partners and produced according to the cultivation and quality standards established for the tier, including living-soil cultivation and an extended cure.

Figures come from the Purple Urkle and Grand Daddy Purple product pages and their linked COAs, rounded to two decimals. They describe the batches listed when this article was published, and a new batch brings a new COA.

Cannabinoids

On these batches, Grand Daddy Purple’s THCA result is 2.94 percentage points higher than Purple Urkle’s, and its total cannabinoids are 2.49 points higher. Delta-9 THC is close on both, at 0.27% and 0.24%.

The minor cannabinoids run the other way. The Purple Urkle batch reports 0.76% CBGA against 0.48% for Grand Daddy Purple, and 0.20% THCV, which was not detected in the Grand Daddy Purple batch.

Terpenes

The Purple Urkle COA measures 2.17% total terpenes, led by β-myrcene and α-humulene. The current Grand Daddy Purple COA does not include a terpene analysis, so the two batches can’t be compared on measured terpenes. For Grand Daddy Purple, the aroma and flavor notes on its listing are the closest guide to this batch.

Batch results can also differ from a cultivar’s reputation. Leafly’s terpene data for Purple Urkle lists myrcene first, followed by pinene and caryophyllene. The Purple Urkle batch’s COA matches on myrcene but did not detect α-pinene or β-caryophyllene.

Aroma, flavor, and appearance

Black Tie’s listings describe both batches as grape- and berry-forward, then diverge on the finish:

• Purple Urkle: sweet grapes, mixed berries, and skunky earth on the nose, with earthy kush and light herbal spice emerging as the flower is broken apart. The listing describes medium-dense, resin-rich buds in forest green and purple.
• Grand Daddy Purple: sweet grape, berry candy, and spicy earth, with a bold, slightly pungent finish. The listing describes dense, resin-heavy buds in deep purple.

Both listings note that the size and color of pieces vary.

Effects and time of use

Black Tie’s product listing characterizes the Purple Urkle batch as slow-building, moving from a sense of calm into body relaxation, with evening or night listed as the preferred time of use. The Grand Daddy Purple listing describes a cerebral lift and a hazy, dreamlike state that gives way to physical relaxation, and lists nighttime.

Those descriptions reflect how each cultivar and batch is characterized, not anything the COA measures. Individual experiences vary.

Lab panels

The Purple Urkle batch links a Full Panel COA from FESA Labs covering cannabinoid potency, terpenes, residual pesticides, residual solvents and processing chemicals, mycotoxins, heavy metals, microbial impurities, and foreign material, with a pass on every safety panel. The current Grand Daddy Purple COA, also from FESA Labs, covers cannabinoid potency, residual pesticides, mycotoxins, microbial impurities, and foreign material, with a pass on each safety panel. Black Tie’s full set of reports is on the Lab Results page.

Why Both Are Purple

The purple in cannabis comes from anthocyanins, the same family of plant pigments found in blueberries and raspberries. Breeder Todd McCormick told Leafly that anthocyanins create color, not flavor, even though they are classed as flavonoids.

Genetics set the potential, but growing conditions also play a part. The Purple City Genetics team told Leafly that cooler temperatures and different lighting during flowering can increase anthocyanin production in many cultivars. Color alone can’t confirm a lineage, and Leafly notes that even Grand Daddy Purple doesn’t always come out purple.

Choosing Between Purple Urkle and Grand Daddy Purple

Both cultivars offer the classic grape-and-berry character associated with legacy purple cannabis. On the current batches, Purple Urkle’s COA includes a measured terpene profile led by myrcene, humulene, and nerolidol, while Grand Daddy Purple has the higher THCA result. Rather than choosing based on THCA percentage alone, compare the aroma descriptions, current laboratory results, and available quantities to determine which better matches your preferences.

FAQs About Purple Urkle and Grand Daddy Purple

Is Purple Urkle the same as Grand Daddy Purple?

No. They are two different cultivars with different names and histories. The most widely repeated account makes Purple Urkle one of GDP’s parents, which is why the two are so often mentioned together.

Is Purple Urkle the parent of Grand Daddy Purple?

It is the most commonly reported parent, crossed with Big Bud. Ken Estes, GDP’s breeder, has described its origin differently in two published interviews without naming Purple Urkle or Big Bud. The relationship is best treated as commonly reported rather than documented.

Which came first, Purple Urkle or GDP?

In the commonly reported account, Purple Urkle came first, as a phenotype selected from Mendocino Purps, and GDP reached the market in 2003. Some databases describe the relationship in reverse, so the order depends on which account you follow.

Which is stronger, Purple Urkle or Grand Daddy Purple?

On the current batches, Grand Daddy Purple tests higher, at 29.73% THCA against 26.79% for Purple Urkle. Potency is a batch result rather than a fixed trait of either cultivar: the previous Grand Daddy Purple batch tested at 26.58% THCA, just below Purple Urkle. The COA on each product page is the place to check.

Do Purple Urkle and GDP taste the same?

Black Tie’s listings describe both current batches as grape- and berry-forward. The Purple Urkle listing adds skunky earth and light herbal spice, while the Grand Daddy Purple listing adds berry candy, spicy earth, and a slightly pungent finish.

Are Purple Urkle and Grand Daddy Purple indicas?

Black Tie’s listings classify both as indica-dominant hybrids. That classification describes how each cultivar is characterized; the COA doesn’t measure it.