How to Grow Critical Mass CBD
Critical Mass CBD is a CBD-rich, feminized strain that crosses a CBD line with the heavy-yielding Critical Mass. An Emerald Cup winner in 2015, it is a 60/40 plant with a high-CBD, low-THC balance (around 5% CBD), a citrus, fruity and woody flavor, and a gentle, relaxed and sociable character. Tall, productive and easy to grow, it is a go-to for anyone who wants a big, CBD-forward harvest.
This is a feminized photoperiod strain of around 2 m that flowers in 8 to 10 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 CBD and Critical Mass roots give it a tall, sturdy structure, a citrus-fruity profile and the big, dense yields Critical Mass is famous for.
Recommended Strains
CBD Critical Mass (1:1)
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CBD | 5% (Low) |
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Type | CBD Feminized |
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Yield | Medium |
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Phenotype | 60% Indica / 40% Sativa |
Candida CBD
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CBD | 10% – 20% (Medium) |
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Type | CBD Feminized |
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Yield | Medium |
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Phenotype | 50% Indica / 50% Sativa |
Productive, mild and consistent, Critical Mass CBD is a rewarding way to grow a high-CBD strain with a clean, citrus-fruity flavor. You can see the full genetics and buy Critical Mass CBD seeds on the strain page, and browse the rest of our CBD seeds alongside it.
Strain Profile at a Glance
| CBD | Around 5% (CBD-rich) |
|---|---|
| THC | Low |
| Lineage | CBD line x Critical Mass |
| Awards | Emerald Cup winner 2015 |
| Type | CBD Feminized (photoperiod) |
| Genetics | 60% Indica / 40% Sativa |
| Climate | Temperate, warm |
| Flowering time | 8-10 weeks |
| Harvest (outdoor) | October |
| Height | 6.56 ft / 2 m |
| Yield indoor | 1.47 oz/ft² (450 g/m²) |
| Yield outdoor | 33.51 oz/plant (950 g/plant) |
| Grow difficulty | Easy, beginner-friendly |
| Flavors | Citrus, Fruity, Woody |
| Effects | Happy, Relaxed, Talkative |
Promos & Deals
Growing a Feminized Photoperiod Strain
Critical Mass CBD 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 10 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 matters here, because this is a tall plant. It can reach around 2 m, and it stretches after the flip, so many growers flip it earlier to keep the final height manageable. Give it an open canopy and some low-stress training to tame that height and spread the light evenly across its big, productive frame.
Climate and Where to Grow It
Critical Mass CBD does well in a warm, temperate or Mediterranean-style climate with plenty of sun, steady warmth and good airflow. Its Critical Mass heritage makes it a vigorous, high-yielding plant, and outdoors it suits a season with room to grow tall and a finish by around October.
It performs well indoors and out, but it really shows outdoors, where it has space to reach its full size. Indoors it returns a solid 450 g/m² in a well-managed tent, while outdoors a healthy plant with room and sun can give a huge 950 g. As a tall, mostly indica plant of around 2 m it needs headroom and support, so plan for its height and keep the canopy open so light and air reach the lower buds.
Keep humidity under control through flowering to protect the dense, chunky colas, which is especially important on a Critical Mass cross: around 55-60% in early bloom, nearer 40-45% as the buds fill out, and lower toward harvest. Big, dense buds can trap moisture inside, so steady airflow and sensible humidity are what keep the finish clean. Aim for daytime temperatures around 72-82°F (22-28°C).
Feeding Schedule (EC Guide)
Critical Mass CBD 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 citrus-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 Critical Mass CBD to a 12/12 light schedule it flowers in 8 to 10 weeks, rewarding patience with big, dense, resinous buds. As a mostly indica plant it fills out with heavy, chunky colas, carrying the weight its Critical Mass side is known for, up a tall frame. 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 450 g/m² indoors and a huge 950 g per plant outdoors with room and sun. Support the heavy buds, give it training so the lower flowers get light, and harvest when most of the trichomes have turned cloudy to capture the fullest citrus-fruity flavor from this CBD-rich plant.
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 especially important on a dense-budded strain like this, because big, chunky buds can stay damp in the middle while the outside dries, and a gentle dry protects both the aroma and the resin.
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 citrus, fruity and woody notes and smooths the smoke, which matters on a CBD-rich Critical Mass where a clean, bright flavor is a big part of the appeal.
What to Do With Your Trim
Don’t bin the sugar leaves you remove while manicuring. Critical Mass CBD carries a good coat of resin, so its trim works well for dry sift, bubble hash or rosin. Because the line is CBD-rich and low in THC, that trim makes for a mild, CBD-forward concentrate run from material most growers would otherwise throw away, and this plant produces plenty of it.
Flavor and Terpenes
Critical Mass CBD has a bright, clean flavor: a citrus and ripe-fruit top note over a soft, woody base. It is a fresh, fruity profile rather than a heavy or gassy one, and a good cure really brings that citrus-and-fruit character forward in the jar and on the inhale.
Its terpene profile shapes that character. Limonene drives the bright, citrus lift that defines the aroma, while myrcene lays down a ripe, fruity base. Alpha-pinene and beta-pinene bring the fresh, woody, pine-like edge, with caryophyllene adding a little peppery spice and linalool a soft floral note. Together they frame the citrus, fruity and woody character Critical Mass CBD is known for.
Effects and Best Use
Critical Mass CBD is defined by its CBD-rich, low-THC balance, so it delivers a gentle, clear-headed character rather than a strong high. It is reported as happy, relaxed and talkative, keeping you level and sociable rather than heavy or spacey, which makes it an easy, everyday profile. With its modest THC it is simple to enjoy without feeling overwhelmed.
That gentle, relaxed and chatty character makes it a versatile, sociable strain, well suited to anyone who wants a high-CBD, low-THC option with an easy feel. The combination of a big, productive grow, a dependable harvest and a clean, citrus-fruity flavor, all from a CBD-rich, award-winning line, is exactly why it stands out.
Common Problems and Pro Tips
The two things to plan for with Critical Mass CBD are its height and its dense buds. It can reach around 2 m and stretches after the flip, so flip it earlier or train it in veg to keep the height in check, and give it support for the heavy colas. Because those buds get big and dense, keep the air moving and hold humidity down as they fill out so moisture does not get trapped inside.
Training pays off on a plant this size. A little low-stress training or a light topping in veg opens the canopy, turns one tall cola into several even ones and keeps the height manageable, which suits its productive structure. A net or stakes keep the heavy branches from bending under those dense buds toward the end of flower.
As a pro tip, protect the citrus-fruity flavor with a clean plain-water flush at the end and a full three to four week cure, which brings that bright character to its best. It is a forgiving, beginner-friendly plant despite its size, so lean on simple habits (steady feeding, good airflow and support) rather than anything advanced.
FAQ
Is Critical Mass CBD a feminized strain?
Yes. Critical Mass CBD is a CBD 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.
How much CBD does Critical Mass CBD have?
Critical Mass CBD is a CBD-rich strain with around 5% CBD and a low THC level, giving it a balanced, CBD-forward profile. That balance is what gives it a gentle, clear-headed character rather than a strong high. It is a mild, everyday profile, and its award-winning, CBD-rich genetics keep that balance consistent from plant to plant.
How long does Critical Mass CBD take to flower?
Critical Mass CBD flowers in about 8 to 10 weeks once you switch it to a 12/12 light schedule, rewarding patience with big, dense buds. As a photoperiod strain you also control how long it vegetates beforehand, which helps you manage its considerable height. Outdoors in a warm climate it is usually ready to harvest around October.
What does Critical Mass CBD taste like?
Critical Mass CBD has a bright, clean flavor built around citrus and ripe fruit, over a soft, woody base. Limonene drives the citrus lift, myrcene the fruity body, alpha- and beta-pinene a fresh woody edge, with caryophyllene and linalool rounding it out. A proper three to four week cure really brings that citrus-and-fruit character forward.
How much does Critical Mass CBD yield?
Critical Mass CBD is a very strong producer thanks to its Critical Mass side, giving around 450 g/m² indoors and a huge 950 g per plant outdoors with room and sun. Results depend on light, pot size and canopy health, so give it headroom, keep it well fed through bloom, and support those heavy, dense colas as they develop.
Is Critical Mass CBD good for beginners?
Yes. Critical Mass CBD is a beginner-friendly strain: it is feminized so there is no sexing, and forgiving as long as you keep the air moving and support the heavy buds. The main thing to plan for is its height, since it can reach around 2 m, so give it headroom and a little training, and its big, dependable harvest rewards even a first grow.
