How to Grow Sour Tsunami
Sour Tsunami is a Cannabis Cup-winning sativa best known for its unusually low THC and clean, Diesel-forward flavour. It carries a gentle 7–10% THC, a citrus, pine, sweet and woody taste, and a creative, euphoric, happy effect, making it a mild, clear-headed strain for growers who want flavour and quality over sheer potency.
Built from Sour Diesel crossed with NYC Diesel, this is a 60% sativa, 40% indica feminized strain with a famous Diesel pedigree. The result is a tall, aromatic plant that delivers a sharp, sour-citrus profile and a light, functional high, all backed by a competition-winning track record.
Recommended Strains
Sour Tsunami
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THC | 7% - 10% (Low) |
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Type | Feminized |
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Yield | Medium |
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Phenotype | 40% Indica / 60% Sativa |
Tijuana
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THC | 20% - 22% (Medium) |
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Type | Feminized |
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Yield | Medium |
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Phenotype | 20% Indica / 80% Sativa |
Because it is forgiving, flavourful and refreshingly gentle, Sour Tsunami is a rewarding grow at any level. You can see the full genetics and buy Sour Tsunami feminized seeds on the strain page, and browse more of our feminized seeds alongside it.
Strain Profile at a Glance
| THC | 7–10% (low) |
|---|---|
| Lineage | Sour Diesel x NYC Diesel |
| Type | Feminized |
| Awards | Cannabis Cup 2014 |
| Genetics | 40% Indica / 60% Sativa |
| Climate | Tropical / warm |
| Flowering time | 9–10 weeks |
| Harvest | October |
| Height | 4.92 ft / 1.5 m |
| Yield | Medium |
| Yield indoor | 1.15–1.47 oz/ft² (350–450 g/m²) |
| Yield outdoor | 15.87–21.16 oz/plant (450–600 g/plant) |
| Grow difficulty | Beginner-friendly |
| Flavors | Citrus, Pine, Sweet, Woody |
| Effects | Creative, Euphoric, Happy |
Promos & Deals
An Award-Winning Strain
Sour Tsunami is a genuine champion, taking a Cannabis Cup win in 2014. That is a notable achievement for a low-THC strain, where the appeal is flavour, aroma and a gentle, balanced effect rather than raw power, and it speaks to how well-made and consistent the genetics really are.
For a grower, that track record is a useful signal: it points to stable genetics and a reliable finish. You can find it alongside our other award-winning cannabis seeds if you want more proven performers in the same mould.
A Low-THC Strain
What sets Sour Tsunami apart is its low THC, at just 7–10%, which is a fraction of what modern high-potency strains carry. That makes it one of our low-THC seeds, and it is exactly why so many people seek it out: a mild, clear-headed experience rather than an intense one.
For growers, the plant itself is cultivated just like any other photoperiod sativa; the difference shows up in the finished flower, which stays gentle and functional. It is a great choice if you enjoy the ritual of growing and the flavour of a quality Diesel, but prefer a light, manageable effect.
Climate and Where to Grow It
Sour Tsunami leans toward a warm, tropical climate with plenty of sun and good airflow, in keeping with its Diesel sativa heritage. It performs both outdoors in a warm season and in a controlled indoor tent, though you should plan for its height, since it stretches tall like a classic Diesel.
Outdoors it finishes around October, with a single plant bringing in a solid 450–600 g in a good spot. Indoors it produces a medium 350–450 g/m². Keep airflow moving and manage humidity as the long, resinous colas fill in, since tall sativa structures do best with an open, well-ventilated canopy.
Indoors, aim for daytime temperatures around 72–82°F (22–28°C) and keep steady air circulation through the tall canopy. Its height is the main thing to plan for: give it vertical headroom, or start low-stress training early to spread the plant out and keep every bud site in good light.
Growing Feminized Photoperiod Seeds
As a feminized strain, every seed grows into a flowering female, so there is no need to sex the plants or remove males. That keeps the grow simple and means no wasted time or space on plants you would only cull later, which is handy on a tall sativa like this.
Being a photoperiod plant, Sour Tsunami flowers on a light change rather than on age. Grow it under a long day (around 18 hours of light) through the vegetative stage, then switch to a 12/12 cycle to trigger flowering. A shorter veg helps keep this naturally tall plant more manageable before the stretch of early bloom.
Feeding Schedule (EC Guide)
This is a vigorous Diesel sativa that can take a steady feed through bloom, but keep nutrients balanced rather than heavy. Start low, build up as the plant asks for more, and taper off for the final flush so the sharp citrus and pine flavour comes through clean and bright.
| Stage | EC (mS/cm) | Notes |
|---|---|---|
| Seedling | 0.4–0.6 | Very light feed, focus on healthy root growth |
| Vegetative growth | 0.8–1.2 | Build the frame, raise nitrogen gradually |
| Early flower | 1.2–1.4 | Shift toward bloom nutrients (P and K) |
| Full flower | 1.4–1.6 | Peak bloom feed while the long colas swell |
| Flush | 0.0–0.4 | Plain water for the final 1–2 weeks |
Flowering and Harvest
Once you flip to 12/12, bloom runs about 9–10 weeks. As a sativa-dominant plant it stretches hard early in bloom, then fills in long, resinous colas rather than the dense, chunky buds of an indica, staying airy and aromatic right to the finish.
Give the tall structure support as the colas gain weight, and keep the canopy open so light reaches the lower flowers. Harvest when most trichomes have turned cloudy with a few amber heads for the fullest expression, and run a short plain-water flush in the last week or two before you cut it down.
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 preserves the sharp, sour-Diesel terpenes, which can fade quickly if the airy buds are dried too hard or too fast in a warm room.
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 brings the citrus and fresh pine notes forward and smooths the smoke, which is exactly what this competition-winning Diesel cross deserves.
What to Do With Your Trim
Don’t bin the sugar leaves you remove while manicuring. Sour Tsunami is a resinous, aromatic plant, so the trim is well suited to dry sift, bubble hash or rosin, giving you a bonus run of sour, citrus-forward concentrate from material most growers would otherwise throw away.
Flavor and Terpenes
Sour Tsunami has a bright, sour-citrus flavour over fresh pine with a sweet, woody base, the sharp Diesel profile its Sour Diesel and NYC Diesel parents are famous for. It is a lively, aromatic taste rather than a muted one, and it is a big part of why the strain is so well regarded.
It carries a clear terpene stack, and all four of its terpenes shape the flavour. Limonene drives the sour-citrus top; pinene brings the fresh pine note; myrcene adds a sweet, rounded depth; and caryophyllene folds in a gentle woody, peppery spice that gives the bright profile a little warmth and structure underneath.
Effects and Best Use
With its sativa-dominant genetics and low THC, Sour Tsunami is reported as creative, euphoric and happy, a light, clear-headed lift rather than a heavy, intense high. It suits daytime and social use, giving a gentle, feel-good buzz that stays functional and easy to enjoy.
At just 7–10% THC it is one of the mildest strains you can grow, which is exactly the appeal for anyone who wants flavour and a subtle lift without being overwhelmed. That gentle character, the Cannabis Cup pedigree, the sharp Diesel flavour and the solid yield are why growers reach for Sour Tsunami.
FAQ
Does Sour Tsunami get you high?
Sour Tsunami is famous for its unusually low THC, at just 7–10%, so it delivers a mild, clear-headed experience rather than a strong, intoxicating high. Most growers choose it precisely because it stays gentle and functional, giving a light, happy, creative lift without the heavy, overwhelming effect of high-THC strains.
What awards has Sour Tsunami won?
Sour Tsunami took a Cannabis Cup win in 2014, which is a strong mark of quality for a low-THC strain and a sign of genetics that finish consistently. A competition win like that points to a stable, well-bred plant, which is reassuring whether you are a first-time or experienced grower.
Is Sour Tsunami indica or sativa?
It is sativa-leaning, at roughly 60% sativa and 40% indica, which it inherits from its Sour Diesel and NYC Diesel parents. That shows in a tall, lively plant and a creative, euphoric, happy character, with just enough indica to keep the gentle, low-THC effect balanced and comfortable rather than racy.
How long does Sour Tsunami take to flower?
About 9–10 weeks once you switch to a 12/12 light cycle, with outdoor plants finishing around October. It is a photoperiod feminized strain, so it blooms on the light change rather than on age, and that slightly longer window suits its tall, Diesel-driven sativa structure as the colas fill in.
What does Sour Tsunami taste like?
Expect a bright, sour-citrus flavour over fresh pine with a sweet, woody base, the Diesel-forward profile its parents are known for. Limonene drives the citrus, pinene brings the pine, myrcene adds the sweet depth, and caryophyllene folds in a gentle woody, peppery spice underneath.
Is Sour Tsunami good for beginners?
Yes. It is a forgiving feminized plant with no males to remove, and its low THC makes for a gentle, approachable result. Plan for its height, since it stretches tall like a Diesel sativa, so give it headroom or start low-stress training early, and it rewards new growers with a clean, mild harvest.
