Cadillac Rainbow feminized cannabis plant in flower

Feminized seeds

Pure MichiganxRuntz

THC: 24-29%
Bloom: 8-9 wks
Yield/sq ft: 1.3-1.6 oz
Level: Moderate

Cadillac Rainbow Feminized Seeds

From $65.00

Candy up top, chocolate-cookie gas underneath and buds that ripen into green, violet and near-black. A balanced Pure Michigan x Runtz hybrid that finishes in 8-9 weeks.

THC24-29%
Bloom8-9 weeks
Height3-5 ft indoors
LevelModerate

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

Quick answerCadillac Rainbow is a balanced hybrid bred from Pure Michigan x Runtz. Expect a candy-sweet nose over chocolate-cookie gas, dense buds that can turn violet and near-black late in flower, supplier-reported THC of 24-29%, and an 8-9 week indoor flowering time.

Cadillac Rainbow at a glance

THC24-29%Supplier reported. Firmly in high-THC territory.

Flowering8-9 wksCounted from the flip to 12/12

Indoor yield1.3-1.6 ozPer sq ft in a tuned room

Height3-5 ftIndoors. 5-7 ft outdoors

Outdoor harvestMid OctMost US latitudes

Bag appealGreen, violet and near-black buds under heavy frostCool late-flower nights bring out the deepest color

What is the Cadillac Rainbow strain?

Cadillac Rainbow is a modern American cross that joins two of the most requested flavor families on today’s shelves. The name says it plainly: heavy, polished Midwest muscle on one side and bright candy color on the other. It is built for growers who want a balanced hybrid that looks as good in the jar as it smokes.

Pure Michigan, itself a cross of Oreoz and Mendo Breath, supplies the backbone. It brings chocolate-cookie gas, dark pigment and a thick coat of resin. Runtz adds the sugary, fruit-candy top notes and the easygoing, feel-good character that made it a household name. Together they produce medium plants with sturdy side branches and dense, spade-shaped buds.

Phenotypes from this feminized line are fairly uniform and tend to settle on the same candy-over-gas profile. As flower matures, many plants shift from lime green through violet toward near-black under bright trichomes. These seeds are bred to produce female plants, so every seed you start is working toward flower.

Pure MichiganRuntz

Pure Michigan x RuntzFeminized line

Cadillac Rainbow

How it feels

Consumers commonly describe a cheerful, chatty start followed by a gradual, easy body calm that does not end the evening. Effects are often reported to last two to three hours.

First 10 minutesSparkling lift
The Runtz side leads with a happy, social buzz and easy laughter.
30 to 60 minutesSmooth cruise
A loose, comfortable body feel settles in while the head stays clear enough to talk.
2 to 3 hoursSoft landing
Most people report a contented wind-down rather than a hard crash.

Commonly reportedEuphoricGigglyRelaxedHappy

With reported THC up to 29%, newer consumers should start small and wait before taking more. Dry mouth and dry eyes are the most common complaints, and some people report feeling anxious or racy at high doses. General reports, not medical guidance.

Aroma, flavor and terpenes

Fruit candy and sugar on the first sniff, then a cookie-dough and cocoa layer with sharp fuel underneath. The smell builds hard in the last three weeks of flower, so run a carbon filter.

Flavor notesCandyFruityCookiesGas

CaryophyllenePepper, spice

Adds the peppery fuel edge from the Pure Michigan side.

LimoneneCitrus, candy

Brightens the fruity, sugary top notes.

LinaloolFloral, lavender

A soft floral sweetness common in candy-family hybrids.

Hang whole branches to dry for 10-14 days near 60°F and 60% RH, then cure in jars for three weeks or more. A slow cure keeps the candy notes from fading behind the gas.

How to grow Cadillac Rainbow

Rated moderate. Sturdy branches and even growth make it forgiving in veg; the real work is airflow and humidity once the dense colas fill in.

Indoors

Veg climate: 74-82°F, 55-65% RH
Flower climate: 68-80°F, 40-45% RH
Color trick: Nights 8-10°F cooler in the last 2 weeks
Light: 750-950 PPFD in flower (LED)
Training: Top once or twice, then spread with LST
Feeding: Medium; ease nitrogen after week 3 of bloom

Outdoors

Plant out: Once frost risk is gone and nights hold above 50°F
Size: 5-7 ft in full sun
Harvest: Mid October
Best fit: Sunny sites with dry falls (USDA 6-10)
Watch for: Mold in dense colas after rain
Protect: Prune lower growth; cover during wet spells

Read the full indoor grow guide

Indoors, Cadillac Rainbow typically finishes at 3 to 5 feet, which fits a 4×4 ft tent comfortably once you control the stretch. Its branches are stiff enough to hold heavy tops, but supporting them with a trellis net in the second half of flower is still a good idea.

Environment

Vegetative: 74-82°F with 55-65% relative humidity.
Flower: 68-80°F with RH held near 40-45%. Spade-shaped buds pack tightly, so steady airflow through the canopy matters more than heat.
Color: dropping night temperatures by 8 to 10°F in the final two weeks helps bring out the violet and near-black tones without slowing growth.

Light and training

Run about 550-750 PPFD in late veg and 750-950 PPFD in flower. Topping once or twice, followed by low-stress training, creates a flat canopy of six to ten main sites. Lollipopping the lower third before week three of bloom sends energy to the tops and cuts down on larfy popcorn buds.

Feeding

Moderate feeding works best. Taper nitrogen after the third week of flower and keep an eye on pH so calcium and magnesium stay available under LED lighting.

Harvest timing

Most plants are ready 8 to 9 weeks after the switch to 12/12. Check trichomes with a loupe: mostly cloudy heads keep the effect upbeat, while letting 10-15% turn amber gives a heavier finish.

Seed to jar in about 22 weeks

A typical indoor timeline. You choose the veg length; the bloom window comes from the genetics.

Germinate1 wkSeedling2 wkVegetate5 wkFlower9 wkDry and cure5 wk

Week 1Week 22

Germinate weeks 1-1
Moist paper towel, 75-80°F
Seedling weeks 2-3
Low light, 65-70% RH
Vegetate weeks 4-8
Top, then train flat
Flower weeks 9-17
8-9 weeks from the flip
Dry and cure weeks 18-22
Slow dry, then jar cure

Growing Cadillac Rainbow outdoors in the US

Outside, Cadillac Rainbow likes full sun and a warm, settled summer. Expect plants of 5 to 7 feet and a harvest around mid October across most of the country. Set plants out after your final spring frost, once nighttime lows stay above roughly 50°F, so they have a long veg run before days shorten.

Because the colas are so dense, autumn moisture is the main threat. Crisp nights near the finish deepen the color, but a week of rain can start mold inside the buds. Strip lower growth for airflow, keep a cover handy and be ready to pull plants early when a long wet stretch is forecast. The outdoor planting guide lists timing by USDA zone.

Home cultivation rules differ from state to state, including plant counts and whether growing is allowed at all. Review marijuana laws by state before you plant.

Will it finish where you live?

ExcellentInland California and the Southwest

Dry, sunny falls let the dense colas finish clean.

GoodColorado Front Range and Utah valleys

Low humidity suits it; cold snaps in October can cut the season short at altitude.

GoodMidwest

Strong summer growth, but harvest before late-October rain and frost.

FairNortheast

Muggy late summers and early cold make a cover or greenhouse worthwhile.

PoorSoutheast and Gulf Coast

Persistent fall humidity is hard on tight, resin-heavy buds.

Confirm your state's home-grow rules before planting. Laws by state

Who Cadillac Rainbow is for

Bag appeal huntersGrowers who want jars of violet and near-black buds coated in frost.
Candy-and-gas fansAnyone who likes a sweet front end backed by real cookie fuel.
4×4 tent growersA 3-5 ft frame that trains well into a flat, even canopy.
Growers who control climateHolding RH near 40-45% in bloom keeps those tight colas clean.

Keep exploring

Hybrid seedsBalanced crosses with the best of both sides High THC seedsOur most potent feminized genetics How to grow marijuana indoorsTent setup, lighting and climate basics Yield calculatorEstimate your harvest by space and light What are trichomes?How to read ripeness under a loupe

Cadillac Rainbow strain data sheet

Genetics

Seed type: Feminized
Genetics: Balanced hybrid (about 50% indica, 50% sativa)
Lineage: Pure Michigan x Runtz

Potency & profile

THC: 24-29% (supplier reported)
CBD: 0.1-1%
Commonly reported effects: Euphoric, Giggly, Happy, Relaxed
Flavors: Candy, Cookies, Fruity, Gas
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 semi-dry, 68-80°F, 40-45% RH in flower
Best USDA zones: 6-10 (best where autumns stay dry)
Outdoor harvest: Mid October

Yield

Indoor yield: 1.3-1.6 oz per sq ft
Outdoor yield: 16-19 oz per plant

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

Cadillac Rainbow FAQ

Is Cadillac Rainbow indica or sativa?

Cadillac Rainbow is a balanced hybrid, roughly an even split of indica and sativa. Its effects are commonly described as an upbeat, social start that eases into calm body relaxation.

How strong is Cadillac Rainbow?

Our supplier reports THC of 24-29%, which places it firmly in the high-THC category. Actual results shift with phenotype, environment and harvest timing, so treat the range as a guide.

How long does Cadillac Rainbow take to flower?

Indoors, most plants finish 8 to 9 weeks after the light schedule changes to 12/12. Outdoors in the US, plan on a harvest around mid October.

How much does Cadillac Rainbow yield?

A tuned indoor room can produce about 1.3 to 1.6 ounces per square foot. Outdoor plants in full sun can produce roughly 16 to 19 ounces each, depending on season length and care.

Is Cadillac Rainbow good for beginners?

It is rated moderate. The plants grow evenly and handle training well, but the dense buds need good airflow and controlled humidity late in flower, so a little prior experience helps.

What does Cadillac Rainbow smell and taste like?

Expect fruit candy and sugar up front, followed by cookie dough, cocoa and fuel. Caryophyllene, limonene and linalool are the terpenes most often associated with this candy-and-gas profile.

Where does Cadillac Rainbow grow best outdoors in the US?

Inland California and the Southwest are the best fit thanks to dry, sunny autumns. Colorado and the Midwest work with good timing, while humid Southeast summers make outdoor runs difficult.

Why do Cadillac Rainbow buds turn purple and black?

Both parents carry dark pigment, and the color shows most when night temperatures drop late in flower. Running nights 8 to 10°F cooler than days in the final two weeks usually brings out the violet and near-black shades.

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