How to Grow Watermelon Z OG Fast Version
Watermelon Z OG Fast Version is a 70/30 sativa-dominant hybrid that crosses Watermelon Zum Zum with OG Eddy Lepp. As a fast version it is a photoperiod plant bred for a quick bloom, pairing a sweet melon and fruity flavor with a creative, euphoric, happy effect. THC runs from 21 to 26%, placing the Watermelon Z OG Fast Version strain in the medium to high range. This guide covers the full grow, from germinating the feminized seeds to the final cure.
It stays compact at around 3.94 ft, finishes flowering in a quick 7 to 8 weeks and gives a high yield of sweet, resinous buds. If you like these genetics, Blimburn also offers the Watermelon Z OG Autoflower for growers who want the same melon profile with no light change at all.
Recommended Strains
Watermelon Z OG Fast Version
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THC | 21% - 26% (High) |
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Type | Feminized |
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Yield | High |
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Phenotype | 30% Indica / 70% Sativa |
Watermelon Z OG
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THC | 18% - 21% (Medium) |
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Type | Feminized |
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Yield | High |
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Phenotype | 55% Indica / 45% Sativa |
Watermelon Z OG Fast Version at a Glance
Before you plant anything, it helps to see the full picture in one place. Here is the quick profile for this fast-flowering feminized sativa, taken straight from the strain’s grow data.
| Seed type | Feminized (Fast Version) |
|---|---|
| Genetics | Watermelon Zum Zum x OG Eddy Lepp |
| Phenotype | 30% Indica / 70% Sativa |
| THC | 21–26% (medium to high) |
| Flowering time | 7–8 weeks |
| Outdoor harvest | All season |
| Height | up to 3.94 ft (1.2 m) |
| Yield level | High |
| Yield indoor | 1.64 oz/ft² |
| Yield outdoor | 21.16–28.22 oz/plant |
| Climate | Temperate |
| Dominant terpenes | Limonene, Terpinolene, Pinene, Caryophyllene, Linalool, Humulene, and more |
| Flavors | Fruity, Melon, Sweet |
| Effects | Creative, Euphoric, Happy |
| Difficulty | Beginner-friendly |
These are feminized seeds, so every plant you grow will flower, and its 70% sativa makeup places it with the sativa seeds for growers who want a bright, fruity, fast-finishing plant. At up to 26% THC it also sits among the high THC seeds.
Promos & Deals
How to Germinate Watermelon Z OG Fast Version Seeds
A healthy harvest starts at germination. The paper towel method is hard to beat: fold the Watermelon Z OG Fast Version seeds inside two damp sheets, slide them between two plates, and keep them somewhere dark at 70 to 79°F. A taproot usually appears in one to five days.
Once the root is a few millimetres long, move each seed into its starter pot with the root pointing down and cover it with about 2 cm of soil. Keep the medium lightly moist, not soaked, and hold humidity around 65 to 70% while the first true leaves open. Because these are feminized seeds, you can skip sorting out males later and give every sprout your full attention.
Starter tips
- Use plain, lightly pH-balanced water (pH 5.5 to 6.5) for the first week.
- Give seedlings gentle light, not a full-power lamp pressed overhead.
- Hold off on nutrients until the second set of serrated leaves appears.
Growing Watermelon Z OG Fast Version in the Vegetative Stage
Watermelon Z OG Fast Version likes a temperate climate with warm, bright summers. Unlike an autoflower, it is a photoperiod plant, so you control the veg stage with the light: keep it on 18 hours of light a day and let it build the frame you want before you flower it. Aim for day temperatures of 68 to 81°F and keep veg humidity in the 50 to 60% band.
Its temperate nature suits a range of US regions, and because the fast version finishes so quickly it beats the weather in shorter seasons:
- Northern California (Emerald Triangle): the long, mild season is more than enough for this fast finisher, which can be harvested early before any autumn damp sets in.
- Pacific Northwest (Oregon and Washington): the quick 7 to 8 week bloom is the key advantage here, letting you harvest well before the wet autumn arrives.
- Colorado Front Range (Denver): the short flowering window dodges early frosts, and cool mountain nights late in flower can deepen color in the buds.
At around 3.94 ft this is a compact, sativa-leaning plant. Top it once it has five or six nodes, and use low-stress training to even the canopy and spread the branches so every bud site gets light, which is how you reach its high yield.
Flowering and Buds of Watermelon Z OG Fast Version
Once you switch to a 12/12 light cycle, Watermelon Z OG Fast Version shows its headline trait: it finishes in just 7 to 8 weeks, noticeably faster than a standard photoperiod plant, while keeping full photoperiod size and yield. Expect some early stretch from its sativa side, then a quick, resinous bloom.
Drop humidity to 40 to 45% during flower and keep airflow moving through the canopy so the buds finish clean. The buds carry a sweet, candy-like melon aroma and often show attractive color. Support the branches as the colas gain weight, and outdoors the fast finish means you can harvest early.
At 21 to 26% THC it frosts over with a generous resin layer, so judge ripeness by the trichomes rather than the calendar, especially given how quickly it ripens.
Common Problems and Pro Tips
Watermelon Z OG Fast Version is forgiving, but its fast bloom and sativa structure point to a few things worth watching.
- Fast timeline: because it ripens in 7 to 8 weeks, start checking trichomes early and have your drying space ready, since the window arrives sooner than with a standard photoperiod plant.
- Feeding: the shorter bloom means you should ramp nutrients down earlier, tapering into the flush so you are not still feeding heavy as the buds finish.
- Stretch and pests: the sativa side stretches, so train early; and check leaf undersides weekly for spider mites through the quick flowering run.
Expert tip: a fast version gives you the speed of an autoflower while keeping the photoperiod advantages, so you can take cuttings from a plant in veg and keep a mother, something autos do not allow. Letting night temperatures drop to around 59 to 64°F in the final two weeks brings out the color this melon strain is known for.
Aroma, Flavor and Effects
The nose is sweet and juicy: ripe watermelon and sweet fruit candy up front with a light, fresh finish. It reads fun and dessert-like rather than heavy, and it sharpens as the buds cure in the jar.
The flavor follows, sweet melon and mixed fruit with a candy-like smoothness. On the effect side it is creative, euphoric and happy, a bright, uplifting lift from its 70% sativa side that suits daytime, creativity and company.
Terpene profile
This is a bright, fruit-forward profile. Limonene leads with a sweet citrus lift that carries the melon-candy character; Terpinolene adds a fresh, fruity complexity; and Pinene brings a crisp, clean edge that keeps the high clear. Caryophyllene layers in a gentle peppery spice, Linalool a soft floral note, and Humulene an earthy, hoppy depth, with carene and more rounding out the blend. Together they make for a sweet, fruity melon profile with real lift.
Nutrient Schedule
Treat the figures below as a starting map, not a rulebook. Watermelon Z OG Fast Version takes a moderate feed well, but its quick bloom means you should taper down a little earlier; read the plant first, as tip burn means back off while pale, slow growth means it wants a little more. All values use EC.
| Stage | EC |
|---|---|
| Seedling | 0.4–0.6 |
| Growth | 0.8–1.2 |
| Early flower | 1.2–1.4 |
| Full flower | 1.4–1.6 |
| Flush | 0.0–0.4 |
Keep the pH around 6.0 to 6.5 in soil and 5.5 to 6.0 in hydro so the roots can actually take up what you feed.
What to Do With Your Trim: Extracts and Hash
Watermelon Z OG Fast Version lays down a generous resin layer, so the trim is worth keeping. The frosty sugar leaves you take off while manicuring carry plenty of trichomes and suit Ice Water Hash, where cold water and agitation separate the resin heads into a clean, solventless concentrate. Pressing that hash into rosin keeps the sweet melon-candy flavor intact, or you can run a solvent extraction if that is your setup. The bare stems will not extract, but chopped and composted they feed organic matter back into the soil for your next grow.
Harvesting, Drying and Curing Watermelon Z OG Fast Version
Timing the harvest comes down to the trichomes. Grab a loupe and watch the heads turn from clear to milky white; a scattering of amber signals peak ripeness. Because this fast version ripens in 7 to 8 weeks, start checking early. Outdoors the quick finish lets you harvest before the autumn weather turns, while indoor runs land at the end of that short flowering window.
After the cut, hang the branches in a dark room at 59 to 68°F with humidity near 50% and gentle air movement. Slow beats fast: drying over 10 to 14 days protects the sweet melon and fruit terpenes that define this strain. When the small stems snap instead of bending, move the buds into jars.
Cure in sealed glass, opening the jars daily for the first week to let moisture escape, then easing off as the aroma deepens. Two to four weeks of patience here is where the sweet melon flavor really comes forward, and it is the step most first-time growers rush.
Frequently Asked Questions
Is Watermelon Z OG Fast Version easy to grow for beginners?
Yes, Watermelon Z OG Fast Version is beginner-friendly. The feminized seeds mean every plant flowers, it stays compact at around 3.94 ft, and its fast 7 to 8 week bloom gets you to harvest quickly. The main things to watch are a little early stretch and tapering nutrients in time for the quick finish.
What does fast version mean for Watermelon Z OG Fast Version?
Watermelon Z OG Fast Version is a photoperiod plant bred for a quicker bloom, not an autoflower. You still flip it to a 12/12 light cycle to start flowering, but it finishes in just 7 to 8 weeks. This gives you autoflower-like speed while keeping full photoperiod size, yield and the ability to take cuttings.
How long does Watermelon Z OG Fast Version take to flower?
Watermelon Z OG Fast Version flowers in a quick 7 to 8 weeks indoors once you switch to a 12/12 light cycle, faster than a standard photoperiod strain. Outdoors the rapid finish lets you harvest early, before wet autumn weather. Start checking trichomes from week six so you catch peak ripeness.
How much does Watermelon Z OG Fast Version yield?
Watermelon Z OG Fast Version is a high yielder. Indoors it gives around 1.64 oz/ft² under good light, and outdoors each plant can reach a generous 21.16 to 28.22 oz/plant. Training to an even canopy so light reaches every bud site helps you make the most of its quick, productive bloom.
How strong is Watermelon Z OG Fast Version?
Watermelon Z OG Fast Version has a medium to high THC level of 21 to 26%. The effect is creative, euphoric and happy, a bright, uplifting lift from its 70% sativa side. It leans daytime and social, making it a lively, fun choice for creativity and company rather than a heavy couch-lock.
What does Watermelon Z OG Fast Version taste and smell like?
Watermelon Z OG Fast Version leads with sweet, ripe watermelon and fruit candy, a fun, dessert-like profile driven by limonene, terpinolene and pinene. The flavor is juicy and smooth rather than heavy, and that sweet melon character deepens and rounds out as the buds cure slowly in the jar.
