Granddaddy Purple feminized cannabis plant in flower

Feminized seeds

Purple UrklexBig Bud

THC: 17-23%
Bloom: 8-10 wks
Yield/sq ft: 1.3-1.6 oz
Level: Moderate

Granddaddy Purple Feminized Seeds

From $65.00

Grape candy, violet buds and a famously sleepy finish. Granddaddy Purple crosses Purple Urkle with Big Bud for a sturdy, high-yielding indica that finishes in 8-10 weeks.

THC17-23%
Bloom8-10 weeks
Height3-4 ft indoors
LevelModerate

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SKU: BMS-GP-FEMXX Categories: Feminized Seeds, High Yield Seeds, Indica Seeds, Indoor Seeds, Outdoor Seeds

Quick answerGranddaddy Purple, often shortened to GDP, is an indica-leaning strain (about 90% indica) bred from Purple Urkle x Big Bud in California. It is known for deep violet buds, a grape-and-berry candy flavor, reported THC of 17-23%, and an 8-10 week flowering time indoors.

Granddaddy Purple at a glance

THC17-23%Supplier reported. Classic strength, heavy body feel.

Flowering8-10 wksAfter lights go to 12/12

Outdoor yield18-25 ozPer plant in full sun

Height3-4 ftIndoors. 4-6 ft outdoors

Outdoor harvestEarly OctMost US latitudes

LegacyThe purple indica many later strains descend fromA parent of Cherry Pie and an ancestor of many modern purple and fruit crosses

What is the Granddaddy Purple strain?

Granddaddy Purple was first bred in California in the early 2000s and quickly became the purple strain people pictured when they heard the word. It crosses Purple Urkle, a Northern California grape-flavored favorite with natural color and a calm, heavy feel, with Big Bud, a line famous for size, density and productivity.

That pairing balanced looks and output in a way few strains had managed. Purple Urkle supplies the violet pigment and candy-grape sweetness, while Big Bud adds the oversized, tightly packed flowers and the stout frame. The plants grow short and broad-leafed, and the buds turn deep purple beneath a bright layer of frost, a contrast that has kept GDP a favorite subject for photos for two decades.

Its influence runs deep. GDP is a parent of Cherry Pie and sits in the family tree of many newer fruit and purple strains. Phenotypes are known for being uniform, and these feminized seeds are bred so each plant grows as a flowering female.

Purple UrkleBig Bud

Purple Urkle x Big BudFeminized line

Granddaddy Purple

How it feels

Consumers commonly describe a dreamy, unhurried euphoria that gives way to deep physical relaxation, a strong appetite and, eventually, sleep. It is widely seen as a nighttime strain, with effects lasting two to four hours.

First 15 minutesDreamy float
A soft, smiling headspace with no rush or racing edge.
30 to 90 minutesLimb-by-limb melt
Heavy relaxation spreads through the body; snacks start to call.
2 to 4 hoursLights out
Many people report drifting off well before the effect fades.

Commonly reportedRelaxedSleepyEuphoricHungry

Reported THC of 17-23% still calls for a measured first dose, and it is best kept for evenings with nothing left on the schedule. Dry mouth, dry eyes and grogginess the next morning are commonly reported. General reports, not medical guidance.

Aroma, flavor and terpenes

Grape soda and mixed berries lead, with a sugary, candy-like sweetness and a faint piney, earthy edge underneath. The smell is sweet rather than skunky but still strong in late bloom, so a carbon filter is worth running.

Flavor notesGrapeBerrySweetCandy

MyrceneEarth, ripe fruit

Anchors the heavy body feel and the dark-fruit base.

PinenePine, fresh herb

Adds the subtle forest note beneath the grape.

CaryophyllenePepper, spice

Gives a light, warm spice on the exhale.

LinaloolLavender, floral

Softens the finish with a gentle floral sweetness.

A slow dry at about 60°F and 60% RH, followed by a cure of at least three weeks, keeps the grape candy aroma bright instead of grassy.

How to grow Granddaddy Purple

Rated moderate, though many growers find it one of the more forgiving classics. The plant is sturdy and uniform; the main job is keeping air moving through its oversized buds late in flower.

Indoors

Veg climate: 72-79°F, 55-65% RH
Flower climate: 65-79°F, 40-50% RH
Color trigger: Cooler nights in the last 2-3 weeks
Light: 700-900 PPFD in flower (LED)
Training: Top once or run SOG with many small plants
Support: Stakes or a trellis for heavy colas

Outdoors

Plant out: After last frost, nights over 50°F
Size: 4-6 ft, bushy and broad
Harvest: Early October
Best fit: Dry autumns (USDA 6-10)
Watch for: Late rain on dense buds
Protect: Prune inner growth; cover in storms

Read the full indoor grow guide

GDP is short and stocky, usually 3 to 4 feet indoors, which makes it a natural fit for small tents and low ceilings. Rated moderate, it tolerates small mistakes better than most modern hybrids. What it does not tolerate is stagnant, humid air around its fat, heavy buds.

Environment

Vegetative: 72-79°F with 55-65% relative humidity.
Flower: 65-79°F with 40-50% RH, easing toward 40% in the last few weeks to keep bud rot out of the big colas.
Color: purple shows strongest when night temperatures drop into the low to mid 60s °F during the final two to three weeks.

Light and training

Run roughly 600-750 PPFD in late veg and 700-900 PPFD in flower under LED. Because the plant stays compact and stretches little, it suits a sea of green setup with several small plants, or a single topping followed by light LST. The buds get heavy, so add stakes or a trellis net before week four of flower.

Feeding

Moderate feeding works best. The Big Bud side drinks steadily in bloom, but too much nitrogen late keeps the leaves dark and slows the color change. A balanced bloom feed plus cal-mag under LED covers most needs.

Harvest timing

Most phenotypes finish 8 to 10 weeks after the flip. Watch the trichomes: a higher share of amber heads leans into the heavy, sleepy finish GDP is famous for.

Seed to jar in about 23 weeks

A typical indoor schedule. Run a short veg for SOG or a longer one for bigger plants; bloom length is set by the genetics.

Germinate1 wkSeedling2 wkVegetate5 wkFlower10 wkDry and cure5 wk

Week 1Week 23

Germinate weeks 1-1
Paper towel or plug, 75-80°F
Seedling weeks 2-3
Mild light, 65-70% RH
Vegetate weeks 4-8
Top once or flip early for SOG
Flower weeks 9-18
8-10 weeks; stake by week 4
Dry and cure weeks 19-23
Slow dry, three-week jar cure

Growing Granddaddy Purple outdoors in the US

Outdoors, Granddaddy Purple grows into a broad, bushy 4 to 6 foot plant and is usually ready in early October, a little ahead of many hybrids. That earlier finish is a real advantage in northern states where the weather turns quickly. Plant out after your last frost once nights stay above about 50°F, and give it the sunniest spot you have.

Healthy plants in full sun can produce roughly 18 to 25 ounces each, but those big, dense buds are exactly what late rain targets. Strip interior leaves for airflow, space plants generously and keep a cover handy for storms in the final weeks. Cool September nights do the coloring for you. Our outdoor planting guide lists dates for each USDA zone.

Check your state’s rules before you plant. Home cultivation is legal for adults in some states and not in others, and plant limits vary. See marijuana laws by state.

Will it finish where you live?

ExcellentInland California and the Southwest

Its home climate: dry autumns and cool nights give big, clean, purple buds.

ExcellentColorado Front Range and Utah valleys

An early October finish beats most frosts, and dry air keeps colas healthy.

GoodMidwest

The early finish helps you harvest ahead of cold, wet late-October weather.

GoodNortheast

Short seasons suit its timing, though humid spells call for careful pruning.

FairSoutheast and Gulf Coast

Heat is fine, but muggy fall air and storms threaten its dense buds.

Check what your state allows for home growing before you plant. Laws by state

Who Granddaddy Purple is for

Classic strain fansPeople who want the original purple indica that later fruit crosses were built on.
Northern outdoor growersAn early October finish gives short-season states a better shot at a full harvest.
Growers who want forgivenessA sturdy, uniform plant that handles small mistakes better than many modern hybrids.
Color loversDeep violet buds under white frost, especially when nights cool down late in bloom.

Keep exploring

Outdoor seedsStrains that finish well in US gardens High yield seedsBig producers for tents and gardens When to plant outdoorsPlanting dates by USDA zone Sea of green explainedMany small plants, one even canopy Strain finderMatch a strain to your space and goals

Granddaddy Purple strain data sheet

Genetics

Seed type: Feminized
Genetics: Indica-leaning (about 90% indica)
Lineage: Purple Urkle x Big Bud

Potency & profile

THC: 17-23% (supplier reported)
CBD: 0.1-1%
Commonly reported effects: Euphoric, Hungry, Relaxed, Sleepy
Flavors: Berry, Candy, Grape, Sweet
Dominant terpenes: Caryophyllene, Linalool, Myrcene, Pinene

Growing

Flowering time: 8-10 weeks
Height: 3-4 ft indoors, 4-6 ft outdoors
Difficulty: Moderate
Climate: Mild and semi-dry, 65-79°F, 40-50% RH in flower
Best USDA zones: 6-10 (dry autumn preferred)
Outdoor harvest: Early October

Yield

Indoor yield: 1.3-1.6 oz per sq ft
Outdoor yield: 18-25 oz per plant

Ranges are typical for this strain and vary with phenotype, environment and technique.

Granddaddy Purple FAQ

Is Granddaddy Purple indica or sativa?

Granddaddy Purple is an indica-leaning strain, usually described as about 90% indica. It grows short and broad-leafed, and its effects center on heavy body relaxation and sleepiness.

How strong is Granddaddy Purple?

Our supplier reports THC of 17-23%. That is moderate by today's standards but still strong for occasional consumers, and results vary with phenotype, conditions and harvest timing.

How long does Granddaddy Purple take to flower?

Indoors, most plants finish 8 to 10 weeks after switching to 12/12. Outdoors in the US, harvest typically comes in early October.

How much does Granddaddy Purple yield?

Indoors, expect roughly 1.3 to 1.6 ounces per square foot with a good setup. Outdoors, plants in full sun can produce about 18 to 25 ounces each, which is where the Big Bud side really shows.

Is Granddaddy Purple good for beginners?

It is rated moderate, but its sturdy, uniform growth makes it one of the friendlier classics for a newer grower. The main thing to learn is keeping humidity down and air moving around its dense buds.

What does Granddaddy Purple smell and taste like?

Grape and mixed berry lead, with a candy-like sweetness and a light pine and earth note underneath. Myrcene, pinene, caryophyllene and linalool are commonly reported in its profile.

Where does Granddaddy Purple grow best in the US?

Dry regions with cool fall nights, like inland California, the Southwest and the Colorado Front Range, suit it best. Its early October finish also makes it a solid pick for the Midwest and Northeast.

How do I get Granddaddy Purple to turn purple?

The color comes from its genetics, but cool nights bring it out. Letting night temperatures fall into the low to mid 60s °F in the last two to three weeks of flower usually deepens the violet without affecting potency.

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