Black Runtz feminized cannabis plant in flower

Feminized seeds

Runtz ZkittlezxGelato selection

THC: 23-26%
Bloom: 8-9 wks
Yield/sq ft: 1.5-1.6 oz
Level: Moderate

Black Runtz Feminized Seeds

From $65.00

Runtz candy flavor in near-black buds. A balanced hybrid with 23-26% reported THC that flowers in 8-9 weeks.

THC23-26%
Bloom8-9 weeks
Height3-5 ft indoors
LevelModerate

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SKU: BMS-BR-FEM Categories: Feminized Seeds, High THC Seeds, Hybrid Seeds, Outdoor Seeds

Quick answerBlack Runtz is a balanced hybrid selected from Runtz, the Zkittlez x Gelato cross, for its unusually dark, near-black buds. It offers a candy, berry and grape flavor with a creamy finish, reported THC of 23-26% and an 8-9 week flowering time indoors.

Black Runtz at a glance

THC23-26%Supplier reported. Strong, but with a smooth, even curve.

Flowering8-9 wksAfter the switch to 12/12

Indoor yield1.5-1.6 ozPer sq ft in a tuned tent

Height3-5 ftIndoors. 5-7 ft outdoors

Outdoor harvestLate SepInto early October

Bag appealSome of the darkest buds we sellViolet to near-black calyxes under bright white trichomes

What is the Black Runtz strain?

Runtz arrived in California in the late 2010s and quickly became one of the most requested candy strains in the country. Black Runtz is a selection from that line, kept for one striking trait: buds that darken from violet to almost black as harvest approaches.

Both grandparents shape the result. Zkittlez supplies the fruity, rainbow-candy sweetness. Gelato adds a creamy, dessert-like smoothness along with the anthocyanin genes that produce purple pigment, which this selection pushes about as far as it goes. The plants grow to medium height with sturdy branches and set dense, spade-shaped buds covered in silvery trichomes.

The contrast is the selling point. Dark calyxes under a white coat of resin make cured flower look dramatic in a jar. These feminized seeds are bred to produce female plants, and the phenotypes are fairly uniform, so most plants in a pack should show similar color and structure.

ZkittlezGelato

Zkittlez x GelatoRuntz phenotype selection

Black Runtz

How it feels

Consumers often describe the classic Runtz arc with a softer slope: bright, happy euphoria first, then calm, loose relaxation. It tends to stay social at modest doses, with effects lasting about two to three hours.

First 10 minutesSparkling mood lift
A cheerful, chatty buzz with plenty of easy laughter.
30 to 60 minutesLoose and calm
Tension fades as a balanced body relaxation spreads out.
2 to 3 hoursSoft landing
A gentle drowsiness shows up late, especially after larger amounts.

Commonly reportedEuphoricRelaxedHappyCalm

With reported THC of 23-26%, start small and wait before taking more. Dry mouth and dry eyes are commonly reported, and some people feel anxious or dizzy at high doses. General reports, not medical guidance.

Aroma, flavor and terpenes

Sweet fruit candy hits first, followed by ripe berry and grape and a smooth, creamy finish that recalls sherbet. It is pleasant but strong in the last weeks of flower, so plan on a carbon filter.

Flavor notesCandyBerryGrapeCreamy

CaryophyllenePepper, spice

Adds a light spicy backbone under the candy.

LimoneneCitrus, candy

Drives the bright, fruity top notes.

LinaloolFloral, lavender

Softens the finish into a creamy, floral sweetness.

Dry slowly at around 60°F and 60% humidity and cure in jars for at least two weeks. A gentle dry protects both the candy terpenes and the deep color.

How to grow Black Runtz

Rated moderate. Black Runtz grows evenly and responds well to training; the skill lies in a stable climate and cool, not cold, nights near the end for the darkest color.

Indoors

Veg climate: 74-80°F, 55-65% RH
Flower climate: 70-80°F, 40-50% RH
Late flower: Nights 8-10°F cooler than days
Light: 800-1,000 PPFD in flower (LED)
Training: Top twice, then SCROG net
Feeding: Moderate; steady potassium in bloom

Outdoors

Plant out: After last frost, nights over 50°F
Size: 5-7 ft in full sun
Harvest: Late September to early October
Best fit: Warm, sunny, sheltered sites (USDA 7-10)
Watch for: Wind damage and late rain on dense buds
Protect: Stake branches; thin the interior

Read the full indoor grow guide

Indoors, Black Runtz usually reaches 3 to 5 feet, so it fits a 4×4 ft tent with some room for the flowering stretch. The plant has a balanced hybrid structure with strong side branches, which makes it a good candidate for an even, flat canopy.

Environment

Vegetative: 74-80°F and 55-65% relative humidity.
Flower: 70-80°F and 40-50% RH. Keep conditions steady, since big swings can stress the plant.
Color: in the final two weeks, let nights run about 8-10°F cooler than days. Cool nights deepen the dark pigment, but avoid real cold stress.

Light and training

Give it about 600-800 PPFD in veg and 800-1,000 PPFD in flower. Top twice to create four main colas, then weave them through a SCROG screen during the first two weeks of flower. Removing small, shaded shoots underneath, often called lollipopping, sends energy to the main tops.

Feeding

A moderate feed with steady potassium through bloom supports bud density. Avoid heavy nitrogen once flowers form, since dark-leaning phenotypes can hide deficiency signs behind the purple color, so check new growth closely.

Harvest timing

Most plants finish 8 to 9 weeks after the flip. Since leaf color is not a reliable guide on a dark strain, rely on trichome color: mostly cloudy for a brighter effect, or about 10-15% amber for a calmer one.

Seed to jar in about 22 weeks

A typical indoor run with a SCROG setup. Shorten veg if your space is small.

Germinate1 wkSeedling2 wkVegetate5 wkFlower9 wkDry and cure5 wk

Week 1Week 22

Germinate weeks 1-1
Paper towel or plug at 75-80°F
Seedling weeks 2-3
Low intensity light, high RH
Vegetate weeks 4-8
Top twice, fill the screen
Flower weeks 9-17
8-9 weeks after 12/12
Dry and cure weeks 18-22
60°F and 60% RH, then jars

Growing Black Runtz outdoors in the US

Black Runtz likes warm, stable, Mediterranean-style weather. Outdoors it can grow 5 to 7 feet and is usually ready from late September into early October. Plant out after your last frost, once nights hold above about 50°F, and pick the sunniest, most sheltered spot you have.

Wind and wet weather are the main concerns. Heavy, dense buds can bend or snap branches, so add stakes or a trellis before flowering starts. If rain is forecast near harvest, thin the interior leaves and use a cover. Mild, cool autumn nights help the color without slowing ripening. See our harvest, dry and cure guide for the finishing steps.

Home growing laws differ by state, including plant limits. Check marijuana laws by state before you plant.

Will it finish where you live?

ExcellentInland California and the Southwest

Warm, dry, stable weather is exactly what this strain prefers.

GoodColorado Front Range and Utah valleys

Cool nights boost color, but wind and early frost need watching.

FairMidwest

A late-September finish helps, though wet falls can threaten dense buds.

FairNortheast

Humidity in late summer means steady pruning and rain protection.

FairSoutheast and Gulf Coast

Warmth suits it, but sticky humidity raises mold risk at harvest.

Check your state's home-grow rules before you plant. Laws by state

Who Black Runtz is for

Bag appeal collectorsGrowers who want jars of dark, frosty flower that stand out.
Candy flavor fansA fruity, creamy profile in the familiar Runtz style.
SCROG and tent growersEven branching fills a screen and keeps the canopy level.
Warm-climate gardenersSunny, sheltered spots in the West finish it best outdoors.

Keep exploring

Hybrid seedsBalanced genetics for any time of day High THC seedsMore strong, resin-heavy strains Outdoor seedsStrains suited to garden growing How to harvest, dry and cureProtect flavor and color after the chop Strain finderMatch a strain to your space and goals

Black Runtz strain data sheet

Genetics

Seed type: Feminized
Genetics: Balanced hybrid (about 50% indica, 50% sativa)
Lineage: Runtz (Zkittlez x Gelato) selection

Potency & profile

THC: 23-26% (supplier reported)
CBD: 0.1-1%
Commonly reported effects: Calm, Euphoric, Happy, Relaxed
Flavors: Berry, Candy, Creamy, Grape
Dominant terpenes: Caryophyllene, Limonene, Linalool

Growing

Flowering time: 8-9 weeks
Height: 3-5 ft indoors, 5-7 ft outdoors
Difficulty: Moderate
Climate: Warm and stable, 70-80°F, 40-50% RH in flower
Best USDA zones: 7-10 (warm, sheltered sites)
Outdoor harvest: Late September to early October

Yield

Indoor yield: 1.5-1.6 oz per sq ft
Outdoor yield: 18-21 oz per plant

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

Black Runtz FAQ

Is Black Runtz indica or sativa?

Black Runtz is a balanced hybrid, roughly an even split of indica and sativa. Its effects usually start upbeat and social, then settle into calm relaxation.

How strong is Black Runtz?

Our supplier reports THC of 23-26%, which places it firmly in high-potency territory. Results vary with phenotype, environment and harvest timing.

How long does Black Runtz take to flower?

Indoors, plan on 8 to 9 weeks of flowering after switching to 12/12. Outdoor plants in the US are usually ready from late September to early October.

How much does Black Runtz yield?

A dialed indoor grow can produce about 1.5 to 1.6 ounces per square foot. Outdoors, healthy plants in full sun can give roughly 18 to 21 ounces each.

Is Black Runtz a good strain for beginners?

It is rated moderate, so it suits growers with a run or two behind them, though careful beginners can manage it. Stable temperatures and good airflow matter more than advanced techniques.

What does Black Runtz taste like?

Fruit candy, berry and grape lead the flavor, with a creamy, sherbet-like finish on the exhale. Limonene, caryophyllene and linalool are commonly reported in this profile.

Where does Black Runtz grow best in the US?

Inland California and the Southwest are the best fit thanks to warm, dry, stable weather. Colorado and Utah valleys also work well, while humid regions need extra pruning and rain protection.

How do I get the darkest color from Black Runtz?

Genetics come first, but you can encourage it by letting nights run about 8-10°F cooler than days during the last two weeks of flower. Avoid real cold, which can slow ripening and stress the plant.

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