The OG 18

OG #18 Feminized Seeds by Reserva Privada

The OG #18 is a feminized Sativa/Indica hybrid from Reserva Privada (DNA Genetics) that yields up to 33% more than standard OG Kush while keeping that fuely, sour Chem Dawg punch intact. Selected as phenotype number 18 out of 40 plants specifically for its heavier colas, tighter bud structure, and flavour that the original OG Kush only hints at, this multiple cup-winning strain crosses Chem Dawg with OG Chem genetics. Available in packs of 6 or 10 OG #18 feminized seeds.

Why the OG #18 Stands Out Among OG Kush Seeds

There are dozens of OG Kush crosses on the seed market, and honestly, half of them disappoint. Airy buds, low yields, plants that stretch into your lights — we've heard the complaints for years. DNA Genetics had the same frustration. They popped 40 seeds with one goal: create a re-feminized OG Kush that actually performs in a grow room. Plant number 18 was the clear winner. Better structure, heavier colas, and a sour diesel flavour profile that the original OG sometimes only whispers at you.

The numbers back it up. Where a standard OG Kush might pull 350-400g/m², the OG #18 feminized seeds consistently deliver 500-600g/m² under the same conditions. That's up to 33% more flower from the same canopy space. The buds come out rock-hard and absolutely caked in THC crystals — the kind where you can see the trichome coverage from across the room. Between 2007 and 2011, this phenotype won three major cannabis cups, which tells you it wasn't just the breeders who noticed the difference.

If you've been burned by underwhelming OG Kush genetics before, this is the one to restore your faith. We'd pick the OG #18 over most OG crosses on the market — and that includes some strains that cost more per seed.

Flavour, Aroma, and What to Expect from OG #18 Feminized Seeds

The Chem Dawg x OG Chem parentage gives this strain a sour diesel punch that hits you the moment you open the jar. There's a sharp, fuely top note — proper petrol-station pungency — layered over a deeper earthy, pine base. When you break the buds apart, your fingers get sticky almost immediately and the room fills with that unmistakable chemical sourness that OG Kush fans chase.

On the smoke or vape, the sour diesel flavour translates cleanly. The inhale is sharp and tangy, the exhale leaves a lingering pine and fuel aftertaste that coats the palate. This isn't a subtle, fruity strain — it's loud. Your carbon filter will earn its keep during the last few weeks of flower. If you're growing in a shared building, plan your ventilation carefully. The smell is the one honest limitation worth flagging: the OG #18 is not a stealth grow. By week 7 of flowering, the terpene production goes into overdrive and discretion goes out the window.

According to research on cannabis use characteristics and subjective effects, users frequently report that strains with strong fuel and diesel terpene profiles tend to produce pronounced physical relaxation in the latter half of the experience (Differences in Cannabis Use Characteristics, PMC9276841). Many growers who've run the OG #18 note that myrcene-rich batches lean more towards evening use.

Growing the OG #18: Cultivation Tips and Yield Data

The OG #18 feminized seeds flower in approximately 9 weeks, which is standard for most indica-leaning hybrids. The real advantage shows up at harvest: 500-600g/m² indoors puts this strain firmly in the heavy-yielding category for an OG Kush phenotype. Outdoors, expect generous production in warm, Mediterranean-style climates.

1. Germinate your OG #18 feminized seeds using the paper towel method or directly in a starter plug. Taproots typically emerge within 24-72 hours.
2. Transplant into your final container once the seedling has 2-3 sets of true leaves. A 10-15 litre pot works well for indoor grows.
3. During vegetative growth, keep nutrient strength moderate. Experienced growers report starting around 500 PPM in veg and working up to 1000 PPM before flipping to flower.
4. Switch to 12/12 lighting when plants reach roughly half your target final height — the OG #18 stretches moderately during the first 2-3 weeks of flower.
5. In flowering, nutrient strength can increase to around 1200 PPM. The plant responds well to higher phosphorus and potassium during weeks 4-7.
6. Support the heavy colas with stakes or a trellis net from week 5 onwards. The buds get dense and the branches will thank you.
7. Flush with plain water for the final 7-10 days before harvest. This helps the sour diesel flavour come through cleanly in the cure.
8. Harvest when trichomes show mostly milky white with 10-20% amber under a jeweller's loupe — typically around day 63.

One thing to watch: the OG #18 can be a hungry feeder, but she's also sensitive to overfeeding. Burnt leaf tips are the first sign you've pushed too hard. Back off by 100-150 PPM and she'll recover within a few days. Compared to something like the Tangie from DNA Genetics, the OG #18 is slightly less forgiving of nutrient mistakes — but the payoff in bud density and resin production makes the extra attention worthwhile.

OG #18 Specifications