Watermelon OG
Cannabis seeds
by Advanced Seeds
Watermelon OG Cannabis Seeds by Advanced Seeds
Watermelon OG is a 50/50 indica/sativa hybrid cannabis seed strain from Advanced Seeds, bred from an elite Melon Purple clone crossed with Black OG. She delivers thick, resinous buds drenched in sweet melon and fruit aromas, with stunning purple hues that deepen in cooler temperatures. If you want dispensary-grade genetics without the dispensary price tag, this is where to look.
Why Watermelon OG Seeds Stand Out
Watermelon OG has been flying off dispensary shelves across North America for good reason — the flavour profile is genuinely distinctive. We're talking sweet, ripe watermelon with deeper fruity undertones, not the vague "fruit punch" smell you get from half the strains that claim fruity genetics. The aroma carries through from the growing phase right into the cured flower, which is something you can't always count on.
Advanced Seeds built this hybrid specifically to capture what makes the original American Watermelon OG so popular while adding the structural reliability of their own breeding stock. The Black OG parent brings density and resin production to the table; the Melon Purple clone delivers that signature sweetness and the purple colouring. The result is a plant that looks as good as it smells — dense, sticky buds covered in trichomes, often shot through with violet and deep purple tones. Those colours aren't just cosmetic either; they tend to intensify when nighttime temperatures drop, so growers in cooler climates or those who can manipulate their indoor environment get particularly photogenic results.
Watermelon OG Growing Characteristics
This strain is genuinely easy to grow, and we don't say that about everything. Watermelon OG plants develop into compact, bushy shrubs with strong lateral branching and a sturdy central stem. That structure makes her naturally suited to both ScrOG and SOG setups without needing heavy training to fill a canopy.
Indoors, expect plants to stay around 100cm tall — manageable in most tents from 120cm height upward. Outdoors, she can stretch to about 200cm, which is still modest enough to keep discreet in a garden setting. Flowering time sits at roughly 60 days, which is on the quicker side for a 50/50 hybrid. Advanced Seeds lists yields of up to 550g/m2 indoors, with equivalent production outdoors under good conditions. Those are optimistic numbers — realistically, a well-dialled indoor setup with decent lighting should get you in that neighbourhood, but first-time growers should expect a bit less and be pleasantly surprised.
One honest note: like most purple-leaning genetics, Watermelon OG can be a touch hungrier for phosphorus and potassium during late bloom. Keep an eye on your feed schedule in the last two weeks before harvest. Nothing dramatic, just worth knowing.
| Specification | Detail |
|---|---|
| Seed Bank | Advanced Seeds |
| Genetics | Melon Purple clone x Black OG |
| Type | 50% Indica / 50% Sativa |
| Flowering Time | Approximately 60 days |
| Indoor Height | ~100cm |
| Outdoor Height | Up to 200cm |
| Indoor Yield | Up to 550g/m2 |
| Outdoor Yield | Equivalent to indoor |
| Suitable Setups | Indoor, outdoor, greenhouse, ScrOG, SOG |
| Seeds per Pack | 3 |
| Colour Traits | Purple hues, intensifying in cooler climates |
Growing Watermelon OG indoors? Pair these seeds with a complete grow tent kit — tent, lighting, ventilation, and carbon filter sorted in one go. For outdoor growers, a quality soil mix and organic nutrients will let those terpenes develop fully. If you're running ScrOG, pick up a flexible trellis net to make the most of her natural lateral branching.
Aroma, Flavour, and What to Expect From Watermelon OG
The name isn't marketing fluff. Crack open a cured bud and you'll get a wave of sweet, almost candy-like watermelon, followed by a broader tropical fruit base. There's a slight earthiness underneath from the OG lineage, but it doesn't dominate — think of it as a grounding note rather than a competing flavour. The smoke (or vapour, if you're using a dry herb vaporiser) is smooth and sweet on the inhale, with that melon character lingering on the exhale.
Visually, harvest day is genuinely satisfying. The buds are dense and coated in a thick layer of frosty trichomes, with those purple hues running through the calyxes and sugar leaves. If you've grown strains that promise purple and deliver a faint lilac tinge on one leaf, Watermelon OG is a different story — the colour is pronounced, especially if you've dropped nighttime temperatures by a few degrees during the last fortnight of flowering.
Watermelon OG vs Other Fruity Strains
If you're comparing Watermelon OG to other fruit-forward genetics in the Advanced Seeds catalogue, the closest competitor is probably their Auto Somango. Somango leans more mango-tropical and finishes faster as an autoflower, but yields are typically lower and the flavour, while pleasant, doesn't have the same specificity. Watermelon OG's melon profile is more defined — you know exactly what you're tasting.
Against other seed banks' watermelon genetics, Advanced Seeds' version holds up well on structure and ease of growing. The 50/50 hybrid balance gives you a plant that doesn't stretch uncontrollably like some sativa-dominant melons, and the 60-day flowering window keeps things moving. For growers who want a fruity strain that doesn't require advanced skills or a massive grow space, Watermelon OG is the best fruity hybrid for small-to-medium indoor setups.
| Trait | Watermelon OG | Auto Somango |
|---|---|---|
| Genetics | Melon Purple x Black OG | Somango x Ruderalis |
| Type | Photoperiod, 50/50 | Autoflower, Indica-dominant |
| Flowering | ~60 days | ~55 days from seed |
| Indoor Yield | Up to 550g/m2 | Up to 450g/m2 |
| Flavour | Sweet watermelon, fruit, earth | Mango, tropical |
| Purple Hues | Yes, pronounced | Minimal |
How to Grow Watermelon OG Seeds
- Germinate your Watermelon OG seeds using the paper towel method or directly in a starter plug. Maintain a temperature of 22-26C and keep the medium moist but not waterlogged. Taproots typically emerge within 24-72 hours.
- Transplant seedlings into their growing medium once the taproot is 1-2cm long. Watermelon OG performs well in soil, coco coir, or hydroponic setups. Start with a mild nutrient solution at around 25% strength.
- During vegetative growth, maintain 18 hours of light per day. Watermelon OG naturally develops strong lateral branches — if running ScrOG, begin tucking branches under the net once they reach the trellis. For SOG, keep veg time short (2-3 weeks) and pack plants closer together.
- Switch to a 12/12 light cycle to trigger flowering. Increase phosphorus and potassium in your feed schedule. Watch for the purple colouring to develop — dropping nighttime temperatures to 15-18C during the last 2 weeks encourages deeper hues without stressing the plant.
- Harvest around day 60 of flowering when trichomes show a mix of milky and amber under a jeweller's loupe. Dry in a dark, well-ventilated space at 18-21C and 55-60% humidity for 7-10 days, then cure in glass jars for at least 2 weeks for the best flavour development.
Frequently Asked Questions
How long does Watermelon OG take to flower?
Watermelon OG has a flowering time of approximately 60 days from the switch to 12/12 lighting. This is fairly quick for a 50/50 indica/sativa hybrid and makes her a good choice if you want quality without a long wait.
Is Watermelon OG suitable for beginner growers?
Yes. Watermelon OG has strong, forgiving genetics with a compact structure and sturdy stems. She doesn't require advanced training techniques to produce good results, though she responds well to ScrOG and SOG if you want to push yields further.
How do I get purple buds from Watermelon OG?
The purple colouring comes from the Melon Purple genetics and will appear naturally in most environments. To intensify the hues, drop nighttime temperatures to 15-18C during the final two weeks of flowering. Avoid going below 12C, as that can stress the plant.
What does Watermelon OG smell and taste like?
Sweet, ripe watermelon is the dominant note, backed by a broader tropical fruit character and a subtle earthy undertone from the Black OG parent. The flavour carries through well into the cured product, especially if you cure for at least two weeks in sealed jars.
Can I grow Watermelon OG outdoors?
Absolutely. Outdoor plants can reach up to 200cm and produce yields equivalent to indoor grows. She also does well in greenhouses. Cooler outdoor climates will naturally bring out more purple colouring in the buds.
How many seeds come in a pack of Watermelon OG?
Each pack contains 3 seeds. Given the strain's strong germination genetics, you can expect a good success rate using standard germination methods like the paper towel technique.
What yield can I expect from Watermelon OG indoors?
Advanced Seeds lists indoor yields of up to 550g/m2. That figure assumes optimised conditions — good lighting, proper nutrition, and trained canopy management. Most growers with a decent setup should land somewhere in the 400-550g/m2 range.
Last updated: April 2026
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Medical disclaimer. This content is for informational purposes only and does not constitute medical advice. Consult a qualified healthcare provider before use of any substance.