Carbon Fiber feminized cannabis plant in flower

Feminized seeds

Grape PiexBiscottixCookies & Cream

THC: 21-25%
Bloom: 8-10 wks
Yield/sq ft: 1.3-1.6 oz
Level: Moderate

Carbon Fiber Feminized Seeds

From $65.00

Grape candy, vanilla cream and a hint of gas in near-black, glassy buds. A balanced triple cross with reported THC of 21-25%.

THC21-25%
Bloom8-10 weeks
Height3-4 ft indoors
LevelModerate

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

Quick answerCarbon Fiber is a balanced hybrid that combines Grape Pie, Biscotti and Cookies & Cream. It is known for a grape, cream and cookie aroma with a light gas finish, near-black buds, reported THC around 21-25%, and an 8-10 week flowering time indoors.

Carbon Fiber at a glance

THC21-25%Supplier reported. Strong but even-tempered.

Flowering8-10 wksOnce lights go to 12/12

Indoor yield1.3-1.6 ozPer sq ft, trained plants

Height3-4 ftIndoors. 5-7 ft outdoors

Outdoor harvestLate SepThrough early October

The lookNear-black flowers with a glassy trichome coatThe dark finish is where the name comes from

What is the Carbon Fiber strain?

Carbon Fiber is a three-way dessert cross. Grape Pie supplies the candied dark-fruit sweetness and purple pigment, Biscotti adds a rich cookie and roasted depth with heavy frost, and Cookies & Cream finishes the blend with a smooth vanilla note and extra vigor. Each parent can be picked out in the finished flower, which is not always the case with triple crosses.

The plant itself is tidy and well built. Expect sturdy branches, short spacing between nodes and a compact frame of 3 to 4 feet indoors. As bloom wraps up, the buds darken to deep violet and often look almost black under a shiny, glass-like layer of trichomes. That dark, woven look is what gave the strain its name.

Growers commonly report consistent plants from these feminized seeds, with most landing on the same grape, cream and gas nose. Feminized seeds are bred to produce female plants, so the whole pack goes toward flowers.

Grape PieBiscotti

Grape Pie x BiscottiCookies & Cream

Carbon Fiber

How it feels

Consumers commonly describe a steady, even high: an upbeat, optimistic mood with a calm body feel underneath. It tends to sit in a comfortable middle gear for two to three hours.

First 15 minutesUpbeat start
A clear, cheerful mood shift without a racing head.
30 to 90 minutesEven keel
Smooth body relaxation threads in while the mind stays easygoing.
2 to 3 hoursSoft fade
The effects taper gently, often without a heavy crash.

Commonly reportedRelaxedEuphoricCalmHappy

Reported THC of 21-25% is still strong, so start low. Dry mouth and dry eyes are commonly mentioned, and some people report anxiety at high doses. General reports, not medical guidance.

Aroma, flavor and terpenes

Grape candy on the nose, a creamy cookie-dough middle and a light gas finish on the exhale. It is noticeable but not the loudest strain in the tent.

Flavor notesGrapeCreamyCookiesGas

MyrceneEarth, ripe fruit

Deepens the dark grape sweetness.

CaryophyllenePepper, spice

Brings the roasted, gassy edge from the Biscotti side.

LimoneneCitrus, sugar

Brightens the candy top note.

A slow dry around 60°F and 60% humidity, followed by a two to four week jar cure, keeps the grape and vanilla notes from flattening out.

How to grow Carbon Fiber

Rated moderate. A sturdy, compact grower that takes training well; the key late-game job is steady airflow around its dense buds.

Indoors

Veg climate: 75-80°F, 55-65% RH
Flower climate: 68-79°F, 40-45% RH
Color trick: Slightly cooler nights in the final 2 weeks
Light: 800-1,000 PPFD in flower (LED)
Training: Top once, LST or SCROG for an even canopy
Feeding: Medium; ease off nitrogen mid-flower

Outdoors

Plant out: Once nights stay above 50°F
Size: 5-7 ft with full sun
Harvest: Late September to early October
Best fit: Sunny, dry falls (USDA 6-10)
Watch for: Bud rot during autumn rain
Protect: Rain shelter and gentle airflow

Read the full indoor grow guide

Carbon Fiber is a comfortable fit for a 3×3 or 4×4 ft tent, finishing around 3 to 4 feet tall indoors. Its tight internodes and strong branches hold up heavy flowers without much support. Rated moderate, it mainly asks for a stable climate and constant gentle air movement in late bloom.

Environment

Vegetative: 75-80°F with 55-65% relative humidity.
Flower: 68-79°F at about 40-45% RH. Keep a fan moving air through the canopy at all times so the dense colas stay dry.
Color: letting nights run a little cooler in the final two weeks deepens the dark violet finish. Mild cold stress is not needed or helpful; small drops are enough.

Light and training

Target 800-1,000 PPFD in flower. Top once around the fifth node, then use LST or a SCROG net to flatten the canopy so every top gets similar light. A light defoliation around day 21 of bloom opens the interior.

Feeding

A medium feeding schedule works well. Reduce nitrogen in the second half of bloom so the leaves can fade and the buds finish clean. Keep pH steady, since stable roots help the plant hold color and resin late.

Harvest timing

Most plants are ready 8 to 10 weeks after the flip, a range that reflects some variation between phenotypes. Read the trichomes: cloudy heads with a little amber keep the balanced, even effect intact.

Seed to jar in about 22 weeks

A standard indoor run. Veg time is flexible; the bloom window depends on the phenotype you grow.

Germinate1 wkSeedling2 wkVegetate4 wkFlower10 wkDry and cure5 wk

Week 1Week 22

Germinate weeks 1-1
Paper towel at 75-80°F
Seedling weeks 2-3
Gentle light, 65-70% RH
Vegetate weeks 4-7
Top once, set up LST
Flower weeks 8-17
8-10 weeks after the flip
Dry and cure weeks 18-22
60°F, 60% RH, then jars

Growing Carbon Fiber outdoors in the US

Carbon Fiber is a solid outdoor choice for much of the country because it usually finishes from late September into early October. That is ahead of the cold, wet weather that arrives in many northern areas later in the month. With full sun, plants commonly grow to 5 to 7 feet and can produce about 18 to 21 ounces each.

Transplant outside after your final frost, once nights stay above about 50°F. The sturdy branches handle wind and heavy flowers well, but tight buds still need protection from autumn rain. A small rain cover or greenhouse, combined with thinning the inner leaves for airflow, keeps the risk of rot low. See our outdoor planting guide for dates by zone.

Home cultivation rules vary widely by state. Before planting, check marijuana laws by state for what applies to you.

Will it finish where you live?

ExcellentInland California and the Southwest

Warm, dry autumns bring out the color and resin with minimal mold risk.

GoodColorado Front Range and Utah valleys

An early October finish usually lands ahead of the first hard freeze.

GoodMidwest

The late September window helps it finish before cold fall rains.

FairNortheast

Workable with an early finish, but late-summer humidity raises rot risk.

FairSoutheast and Gulf Coast

Heat is not a problem; persistent humidity around dense buds is.

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

Who Carbon Fiber is for

Balanced-high fansPeople who want a calm, upbeat effect that neither races nor sedates.
Color loversGrowers who want near-black, glassy flowers with real shelf presence.
Northern outdoor growersA late September to early October finish beats much of the fall weather.
Tent growersA compact 3-4 ft frame with strong branches suits standard tents.

Keep exploring

Outdoor seedsGenetics that finish before fall weather Hybrid seedsBalanced strains for any time When to plant outdoorsPlanting dates by USDA zone Strain finderMatch a strain to your space and climate What is a phenotype?Why plants from one pack can differ

Carbon Fiber strain data sheet

Genetics

Seed type: Feminized
Genetics: Balanced hybrid (about 50% indica, 50% sativa)
Lineage: Grape Pie x Biscotti x Cookies & Cream

Potency & profile

THC: 21-25% (supplier reported)
CBD: 0.1-1%
Commonly reported effects: Calm, Euphoric, Happy, Relaxed
Flavors: Cookies, Creamy, Gas, Grape
Dominant terpenes: Caryophyllene, Limonene, Myrcene

Growing

Flowering time: 8-10 weeks
Height: 3-4 ft indoors, 5-7 ft outdoors
Difficulty: Moderate
Climate: Warm and semi-dry, 68-79°F, 40-45% RH in flower
Best USDA zones: 6-10 (dry autumn regions preferred)
Outdoor harvest: Late September to early October

Yield

Indoor yield: 1.3-1.6 oz per sq ft
Outdoor yield: 18-21 oz per plant

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

Carbon Fiber FAQ

Is Carbon Fiber indica or sativa?

Carbon Fiber is a balanced hybrid, close to an even indica and sativa split. Its effects stay in the middle too, mixing an upbeat mood with a calm body feel.

How strong is Carbon Fiber?

Our supplier reports THC between 21% and 25%. That is potent but more manageable than the strongest strains, and actual results depend on phenotype, environment and harvest timing.

How long does Carbon Fiber take to flower?

Expect 8 to 10 weeks of flowering after the switch to 12/12 indoors. Outdoors in the US, it typically finishes from late September to early October.

How much does Carbon Fiber yield?

Indoors, a trained canopy can produce about 1.3 to 1.6 ounces per square foot. Outdoors, healthy plants in full sun can reach around 18 to 21 ounces each.

Is Carbon Fiber easy to grow?

It is rated moderate. The plant is sturdy and compact, but its dense flowers need steady airflow and humidity near 40-45% in late bloom to stay clean.

What does Carbon Fiber taste like?

Grape candy, vanilla cream and cookie dough lead, with a light gas note at the end. Myrcene, caryophyllene and limonene are terpenes commonly reported for it.

Where does Carbon Fiber grow best in the US?

Inland California and the Southwest are ideal, but its late September to early October finish also suits Colorado and much of the Midwest. In humid regions, plan on extra airflow or a rain cover.

Why are Carbon Fiber buds so dark?

Grape Pie passes along strong purple pigment, and cooler late-flower nights intensify it. The buds often finish deep violet to almost black, which inspired the name.

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