Cobalt Haze Feminized Seeds – Sensi Seeds · Fruity Haze Hybrid for High Yields & Balanced Effects

Cobalt Haze Feminized Seeds from Sensi Seeds produce tall, vigorous plants that deliver large harvests of aromatic, resin-coated buds with a perfectly balanced sativa-indica experience.

Are you tired of weak, inconsistent highs and bland-tasting buds?

Many strains promise a powerful high and rich flavor but fall short—leaving you with flat aromas, disappointing yields, or an unbalanced effect that’s either too sleepy or too jittery. It’s frustrating when your hard work doesn’t translate into a satisfying harvest.

Imagine your plants stretching tall, loaded with dense, sticky colas that burst with blueberry-citrus aroma

Now picture harvesting over 700 grams per plant outdoors, with buds that smell like fresh fruit and skunk, and a high that lifts your mood while melting away stress. That’s the reality with Cobalt Haze—no guesswork, no letdowns.

Cobalt Haze delivers consistent, high-impact results you can count on

Bred from legendary genetics—Silver Haze, Afghani #1, and Blueberry—Cobalt Haze combines explosive sativa growth with indica’s generous yields. Feminized seeds ensure every plant flowers, so you maximize space and harvest only top-shelf buds.

Why Cobalt Haze grows massive, resin-rich harvests with ease

Cobalt Haze thrives in warm, sunny environments, making it ideal for Mediterranean climates or long outdoor summers. Its sativa heritage drives impressive vertical growth—reaching up to 1.80 m (5.91 ft) outdoors—while its indica roots ensure dense bud development. The plant’s natural resistance and low maintenance needs mean you spend less time troubleshooting and more time enjoying your crop.

Factors that shape your harvest—and how Cobalt Haze makes them easy to control

• Genetics: Feminized seeds eliminate male plants, ensuring 100% flowering females and consistent results.
• Light: Performs best with full sun or strong indoor lighting (HPS/LEC), supporting vigorous growth.
• Climate: Prefers warm, dry conditions—ideal for outdoor grows in sunny regions or greenhouse setups.
• Training: Responds well to LST and SCROG, helping manage height and boost yields indoors.
• Watering: Moderate needs; avoid overwatering as its structure favors good airflow.
• Harvest timing: Flowering lasts 9 weeks indoors, with outdoor harvests ready by October—easy to plan.
• Nutrients: Medium feeder—responds well to balanced organic or mineral diets without overcomplicating your routine.

Recommended routine for maximum flavor, yield, and effect

1. Start seeds in a warm, humid environment (22–25 °C, 60–70% RH).
2. Transplant to final pot early—18–27 L (4.76–7.14 gal) for autos, 11–20 L (2.91–5.28 gal) for photoperiods.
3. Use airy soil or coco with Bio Bloom BioBizz to support root and early growth.
4. Switch to 12/12 light cycle to trigger flowering; maintain 20–25 °C and 40–50% RH.
5. Apply bloom boosters like Boost Accelerator Canna during peak flowering for denser buds.
6. Monitor trichomes—harvest when milky with slight amber for balanced effects.
7. Flush 7–10 days before harvest and cure buds for 2–4 weeks to enhance flavor.

Advantages and benefits of growing Cobalt Haze

• Large yields: Up to 450 g/m² (1.14 oz/ft²) indoors, over 700 g (24.69 oz) per plant outdoors.
• Consistent quality: Stable genetics from Sensi Seeds ensure reliable performance every grow.
• Delicious flavor: Fruity blueberry with citrus and skunky notes—perfect for connoisseurs.
• Balanced effect: Uplifting cerebral buzz followed by deep relaxation—ideal for daytime or evening.
• Easy to grow: Low to medium difficulty, suitable for beginners and experts alike.
• Discreet smell during grow: Medium odor—manageable without a carbon filter in most setups.
• Community-approved: Chosen and named by the Sensi Seeds community for its standout performance.

Technical specifications

• Breeder / Brand: Sensi Seeds
• Type: Feminized
• Dominance: Sativa-dominant hybrid (60% sativa / 40% indica)
• Genetics: Silver Haze × Afghani #1 × Blueberry
• Indoor flowering: 9 weeks
• Outdoor harvest: October (Northern Hemisphere)
• Indoor yield: 450 g/m² (1.14 oz/ft²)
• Outdoor yield: Over 700 g/plant (24.69 oz/plant)
• Indoor height: 1.20–1.50 m (3.94–4.92 ft)
• Outdoor height: Up to 1.80 m (5.91 ft)
• Difficulty: Low to medium
• Structure: Tall, branched, with significant stretch in pre-flowering
• Climate: Warm, sunny, Mediterranean
• Resistance: Moderate resistance to mold and pests
• Training: Suitable for LST, SCROG, topping (in veg)
• Substrate: Soil or coco with good drainage
• Light cycle: 18/6 (veg), 12/12 (flowering)
• Temperature: 22–26 °C (veg), 20–25 °C (flowering)
• Humidity: 60–70% (seedling), 50–60% (veg), 40–50% (flowering)
• pH: 6.0–6.5 (soil), 5.8–6.2 (coco/hydro)
• Smell in grow: Medium
• THC: High (15–25%)
• CBD: Low (approx.
• Aromatic profile: Limonene, myrcene, pinene
• Flavour: Fruity, blueberry, citrus, skunky, woody
• Effect: Balanced—cerebral, uplifting, relaxing, creative

Frequently Asked Questions

What if my Cobalt Haze plants grow too tall?

Use low-stress training (LST) early in veg to control height. Indoors, consider a SCROG setup to manage vertical growth and maximize light exposure.

How do I know when to harvest Cobalt Haze?

Check trichomes with a magnifier. Harvest when most are milky with some amber for a balanced high. Indoors, flowering takes about 9 weeks; outdoors, harvest in October.

Can I grow Cobalt Haze indoors successfully?

Absolutely. Provide strong lighting (HPS/LEC), maintain climate control, and use techniques like LST to manage its height. Yields up to 450 g/m² are achievable.

Why did Sensi Seeds name it Cobalt Haze?

The name was chosen by the Sensi Seeds community, previously known as Sensi #11. It reflects the strain’s vibrant, electric high and deep blueberry tones in the buds.

Personal Experience of Pevgrow’s CEO (Alan)

I’ve tested dozens of Haze hybrids, but Cobalt Haze stands out for its reliability and flavor. I grew it on my rooftop in Barcelona—full sun, minimal intervention—and it shot up to 1.70 m (5.58 ft), loaded with sticky, fragrant colas. The high is smooth: first a wave of creativity, then a gentle body melt. I love how it bridges old-school Haze energy with modern yield expectations. I’ve reused seeds from my harvest, and the genetics stayed stable. If you want a powerful, tasty sativa hybrid that doesn’t demand perfection, this is your plant.