How to Grow Rainbow
Rainbow is a balanced, feminized hybrid built from a Z OG x Z OG cross, so it doubles down on everything that fruity line is known for. It leans very slightly indica at 55/45, carries a high 19-24% THC, and delivers a sweet, fruity flavor with an energetic, focused and euphoric effect. Compact, productive and forgiving, it is a strong choice whether you are growing your first crop or your tenth.
This is a feminized photoperiod hybrid of around 1.2 m that flowers in 8 to 9 weeks once you switch it to bloom. Every seed grows into a flowering female, so there is no need to identify the sex or remove males, which keeps the grow simple from start to finish. Its doubled Z OG heritage gives it a sturdy, bushy structure, a sweet fruity profile and a genuinely heavy yield for a plant of its size.
Recommended Strains
Rainbow
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THC | 19% - 24% (High) |
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Type | Feminized |
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Yield | High |
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Phenotype | 55% Indica / 45% Sativa |
Rainbow Kush
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THC | 17% - 22% (Medium) |
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Type | Feminized |
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Yield | Medium |
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Phenotype | 50% Indica / 50% Sativa |
Easy to run, resinous and very productive, Rainbow is a rewarding way to grow a sweet, high-THC hybrid with an upbeat daytime character. You can see the full genetics and buy Rainbow seeds on the strain page, and browse the rest of our feminized seeds alongside it.
Strain Profile at a Glance
| THC | High (19-24%) |
|---|---|
| Lineage | Z OG x Z OG |
| Type | Feminized (photoperiod) |
| Genetics | 55% Indica / 45% Sativa |
| Climate | Tropical, warm |
| Flowering time | 8-9 weeks |
| Harvest (outdoor) | October |
| Height | 3.94 ft / 1.2 m |
| Yield indoor | 1.64-1.97 oz/ft² (500-600 g/m²) |
| Yield outdoor | 21.16-28.22 oz/plant (600-800 g/plant) |
| Grow difficulty | Easy, beginner-friendly |
| Flavors | Fruity, Sweet |
| Effects | Energetic, Euphoric, Focused |
Promos & Deals
Growing a Feminized Photoperiod Strain
Rainbow is a photoperiod strain, so it flowers in response to the light cycle rather than on age. You grow it under a long day of around 18 hours of light while it builds size and structure, then switch to a 12/12 light schedule to trigger flowering, which runs 8 to 9 weeks from the flip to harvest. Because the seeds are feminized, every plant comes up female and goes on to flower, so you never have to check the sex or cull males.
That control over the light cycle is one reason it suits first-time growers. You decide how long to veg the plant and therefore how big it gets before you flip it, which lets you match it to your space. At a compact 1.2 m with a balanced, bushy structure, it is easy to manage and responds well to simple techniques, so a little low-stress training is all it takes to spread the light evenly and lift the already strong yield.
Climate and Where to Grow It
Rainbow does best in a warm, tropical or Mediterranean-style climate with plenty of sun, steady warmth and good airflow. Its doubled Z OG heritage makes it a vigorous, adaptable plant, and outdoors it suits a long, warm season that lets its resinous buds ripen fully and finish by around October.
It performs well indoors and out. Indoors it returns a heavy 500-600 g/m² in a well-managed tent, while outdoors a healthy plant with room and sun can give a very large 600-800 g. As a compact indica-leaning hybrid of about 1.2 m it stays short and manageable, so the main job is keeping the canopy open so light and air reach the lower buds on such a productive plant.
Keep humidity under control through flowering to protect the dense, resinous colas: around 55-60% in early bloom, nearer 40-45% as the buds fill out, and lower toward harvest. A chunky, high-THC hybrid can hold moisture inside its sticky buds, so steady airflow and sensible humidity keep the finish clean. Aim for daytime temperatures around 72-82°F (22-28°C), which this warm-climate plant enjoys.
Feeding Schedule (EC Guide)
Rainbow is a hungry, high-yielding plant, but it still pays to build nutrients up gradually and let the plant set the pace. Feed it steadily through veg and bloom, then taper off for the final flush so the sweet, fruity flavor comes through clean and the smoke finishes smooth. The ranges below are a starting guide; adjust to your water and medium.
| Stage | EC (mS/cm) | Notes |
|---|---|---|
| Seedling | 0.4-0.6 | Very light feed while roots establish |
| Vegetative growth | 0.8-1.2 | Raise nitrogen as the plant builds size |
| Early flower | 1.2-1.4 | Shift toward bloom nutrients (P and K) |
| Full flower | 1.4-1.6 | Peak bloom feed while the buds swell |
| Flush | 0.0-0.4 | Plain water for the final 1-2 weeks |
Flowering and Harvest
Once you switch Rainbow to a 12/12 light schedule it flowers in 8 to 9 weeks, a fairly quick turnaround for a plant that yields this heavily. As a balanced hybrid it fills out with solid, chunky, frosty colas up a compact frame rather than stretching tall. Grown outdoors in a warm climate it is typically ready to harvest around October, once the trichomes have turned mostly cloudy.
Yields are excellent: around 500-600 g/m² indoors and a large 600-800 g per plant outdoors with good sun and space. Give it a little training so the lower buds get light, feed it well through bloom, and harvest when most of the trichomes have turned cloudy for the fullest sweet, fruity flavor and the strongest effect from its high THC.
Drying and Curing
Dry whole plants or branches in a dark room at around 60°F (15-18°C) and 55-60% humidity for 7-14 days, until the thin stems snap rather than bend. A slow, even dry is important with such a resinous, high-THC hybrid, because its sticky, dense buds can stay damp in the middle while the outside dries, and a gentle dry protects both the aroma and the trichomes.
Then cure the trimmed buds in sealed jars, burping them daily for the first week and letting them settle for three to four weeks. A proper cure is what brings out the sweet, fruity notes and smooths the smoke, which matters on a doubled Z OG cross where that bright, fruity-sweet character is the main attraction.
What to Do With Your Trim
Don’t bin the sugar leaves you remove while manicuring. Rainbow is a very resinous, trichome-heavy plant, so its trim works especially well for dry sift, bubble hash or rosin. Given its high THC, that trim makes for a strong, flavourful sweet-and-fruity concentrate run from material most growers would otherwise throw away.
Flavor and Terpenes
Rainbow is built around sweetness and ripe fruit: a bright, sweet, fruity profile inherited straight from both sides of its Z OG cross, with a soft, fresh undertone rather than anything heavy or gassy. It is a cheerful, easy flavor rather than a complex one, and a good cure really brings that sweet, fruity character forward in the jar and on the inhale.
Its terpene profile shapes that character. Terpinolene drives the fresh, fruity lift that defines the aroma and pairs with the upbeat effect, while caryophyllene adds a warm, peppery spice underneath the sweetness. Pinene, from both the alpha and beta forms, brings a clean, fresh, pine-like edge that ties into the clear-headed, focused character. Together they frame the sweet, fruity profile Rainbow is known for.
Effects and Best Use
With its high 19-24% THC and balanced 55/45 make-up, Rainbow delivers a bright, upbeat experience rather than a heavy one. It is reported as energetic, euphoric and focused, so it leans toward daytime and social use, keeping you clear-headed and upbeat rather than couch-bound. Because the THC runs high, it is still worth starting with a moderate amount, especially if you have a lower tolerance.
That energetic, focused profile makes it a good daytime strain, well suited to creative work, getting things done or sharing with friends. The combination of an easy grow, a very strong yield and a sweet, fruity flavor, all with a high-THC kick and an upbeat effect, is exactly why it stands out.
Common Problems and Pro Tips
The most common issue with a resinous, high-yielding hybrid like Rainbow is moisture getting trapped in the dense, sticky buds late in flower. Keep the air moving around and through the canopy, hold humidity down as the flowers fill out, and don’t let the plant sit in still, damp air. Defoliating a few of the largest fan leaves in mid-bloom helps light and air reach the lower buds on such a productive plant.
Because it is a compact, bushy plant that yields heavily, support it well. A little low-stress training or a light topping in veg opens the canopy and turns one dominant cola into several even ones, which suits its productive structure. Give it a sturdy frame or some stakes, as those heavy, frosty colas gain real weight toward the end of flower and can weigh the branches down.
As a pro tip, protect the sweet, fruity flavor, since it is the appeal of this strain: run a clean plain-water flush at the end and cure for three to four weeks, which brings that bright character to its best. It is a forgiving plant that suits a first grow, so lean on simple habits (steady feeding, good airflow and patience at harvest) rather than anything advanced.
FAQ
Is Rainbow a feminized strain?
Yes. Rainbow is a feminized photoperiod strain, so every seed grows into a flowering female and you never have to identify the sex or remove males. You grow it under long days, then switch to a 12/12 light schedule to start flowering. That keeps the whole crop productive and makes the grow more straightforward, which is part of why it suits first-time growers so well.
How much THC does Rainbow have?
Rainbow is a high-THC strain, testing at around 19-24%. Combined with its balanced 55/45 genetics, the result is an energetic, euphoric and focused effect that leans toward daytime rather than night-time use. Because the THC still runs high, it is worth starting with a moderate amount if your tolerance is lower, then adjusting from there to suit you.
How long does Rainbow take to flower?
Rainbow flowers in about 8 to 9 weeks once you switch it to a 12/12 light schedule, a fairly quick turnaround for a plant that yields this heavily. As a photoperiod strain you also control how long it vegetates beforehand, so you can size it to your space. Outdoors in a warm climate it is usually ready to harvest around October.
What does Rainbow taste like?
Rainbow has a sweet, fruity flavor inherited straight from both sides of its Z OG cross, with a soft, fresh undertone rather than anything heavy or gassy. Terpinolene drives the fresh, fruity lift, caryophyllene adds a peppery spice, and pinene brings a clean, fresh edge. A proper three to four week cure really brings that sweet, fruity character forward.
How much does Rainbow yield?
Rainbow is a very strong producer, giving around 500-600 g/m² indoors and a large 600-800 g per plant outdoors with good sun and space. Results depend on light, pot size and canopy health, so keep the plant well fed through bloom, train it lightly for an even canopy, and support those heavy, frosty colas as they develop.
Is Rainbow good for beginners?
Yes. Rainbow is a beginner-friendly strain: it is compact at around 1.2 m, flowers quickly in 8 to 9 weeks, and stays forgiving as long as you keep the air moving and the feeding steady. Its feminized seeds mean no sexing, and its heavy yield rewards even a simple grow, which makes it a confidence-building choice for a first crop.
