Black Widow Seeds

The Strength of Black Widow

With THC levels ranging from 24% to 28%, it packs a serious punch.

Known for its high potency

The high kicks off with a cerebral rush and an uplifting buzz that some users enjoy in the early part of the day - but go easy, because higher doses tend to lean into a heavier, body-melting effect. It’s a powerful strain with bold flavor and a strong reputation - great for experienced smokers looking for something intense.

Feel the High of Black Widow

This knockout Hybrid hits fast and hits hard, kicking off with a buzzing head rush that lights you up with euphoria and a clear, uplifting energy. It’s the kind of high that grabs your attention and pulls you into the moment - colors seem brighter, music feels deeper, and everything just feels a little more fun.

As it settles in, that cerebral buzz gives way to a smooth body high that wraps you up in a calm, happy haze without knocking you out right away. It’s the perfect strain for sparking creativity, laughing with friends, or just zoning out to your favorite playlist. And yes - the munchies are real with this one, so have snacks on deck. If you’re chasing bold effects, big flavor, and a high that evolves beautifully, Black Widow absolutely delivers.

Responsible marijuana use within one's tolerance levels can produce pleasant effects- avoid excessive intake.

The Flavor of Black Widow

This lemon venoms flavor is wild - in the best way. The first hit hits you with this crisp mix of earthy pine and bright citrus, almost like lemon zest on top of fresh-cut wood.

It’s smooth on the inhale, but once you exhale, you get this spicy, herbal kick that hangs around, kind of warm and tingly - definitely the caryophyllene and myrcene doing their thing. And there’s this little sweet, funky note underneath it all that keeps you coming back for more. Honestly, it’s one of those strains where the flavor keeps you just as locked in as the high.

Flowering Time 63-70 Days

-- Outdoor Grow (Full Sun / In Ground) --
Height: 6 Ft Plus
Yield: 1 - 1 1/2 Plus lbs. Cured

How to Grow Black Widow Marijuana Indoors and Outdoors

What to Watch for When Growing Black Widow - It has moderate resistance, but the buds get dense and resin-heavy in late flower, which makes them more prone to bud rot or mildew if your humidity gets out of control. Strong airflow and keeping humidity under control in flower is key. Using a preventative spray like Holi Moli Eliminator during early to mid flower will help keep mold, mildew, and pests like spider mites in check.

Temperature Fluctuations: This strain prefers a stable environment but can handle light swings without too much stress. Just don’t let night temps dip below 60°F - that can stunt growth and slow things down, especially during flower.

Nutrient Sensitivity: It isn’t super sensitive, but it doesn’t like to be overfed, especially with nitrogen in flower. That can throw off pH and dull the flavor. Stick to a clean, balanced feed - Holi Moli Juice is a great all-in-one option if you want to keep it simple from veg through harvest.

Odor Control: This one gets loud. Expect bold, skunky citrus and earthy funk once those buds start stacking. Indoors, a carbon filter is a must unless you want the whole place reeking of Widow’s bite.

Stretching: It can stretch 1.5x its veg height after flip, so give it room to rise. Pro Tip: Flip to 12/12 when your plant hits 20–22 inches tall (usually around week 5 or 6) to keep your canopy under control and prevent overcrowding.

Support: This beauty stacks on some heavy buds, so you’ll want to set up support early. Don’t wait until the branches start leaning - by then, they’re more likely to bend or snap. A few bamboo stakes or a trellis net during early flower can save you a lot of trouble later on.

Best Climate to Grow Black Widow Cannabis

This heavy-hitting Hybrid thrives in warm, dry climates with long sunny days and low humidity. This strain loves to soak up the sun, so make sure to plant it in a spot that gets at least 6-8 hours of direct sunlight each day, along with a nice natural breeze to help with airflow. Good circulation is especially important during late flower when those dense buds start forming.

To keep humidity under control outdoors, water early in the morning so excess moisture can evaporate throughout the day. Add a layer of mulch on top of your soil to help lock in moisture at the roots while keeping the surface dry. Also, thin out the lower branches and inner foliage to improve airflow through the canopy. If humidity spikes or rain is in the forecast during late flower, use a simple canopy or rain cover to protect the buds without blocking air movement.

Grow Bag Sizes & Spacing:

— 5-gallon bags – 2–3 feet apart

— 10-gallon bags – 3–4 feet apart

— 15-gallon bags – 4–5 feet apart

— 20-gallon bags – 5–6 feet apart

Fabric grow bags are highly recommended - they breathe better than plastic, drain well, and help keep roots cooler on hot days. Just place them on a well-draining surface so water doesn’t pool up around the base after heavy watering or rain.

How to Grow Black Widow Marijuana in Subtropical Climates

This resin-loaded variety can be grown in hot, arid subtropical climates, but you’ll need to take a few extra steps to keep it thriving in the heat. The intense sun and dry air can dry out your soil quickly, so fabric grow bags are a smart choice. They promote airflow to the roots and drain well, but you’ll want to keep a close eye on moisture levels. Adding a thick layer of mulch over the soil helps keep the root zone cool and retains moisture through those scorching afternoons.

Even in dry climates, humidity can still spike during late flower or after a rare rainstorm, which can put dense buds at risk for mold or bud rot. Water early in the day so the plants have time to dry off, and be sure to prune lower branches and thin inner foliage to keep air moving through the canopy. Choose a sunny, open location that gets plenty of direct light and natural airflow, and avoid planting near fences or walls that could block the breeze or trap excess heat. If temps rise above 90°F for extended periods, consider using white shade cloth during peak heat hours to reduce stress without sacrificing sunlight.

Grow Bag Sizes & Spacing:

— 5-gallon bags – 2–3 feet apart

— 10-gallon bags – 3–4 feet apart

— 15-gallon bags – 4–5 feet apart

— 20-gallon bags – 5–6 feet apart

If you're growing in hotter zones, 15- or 20-gallon bags will give your plants more room to spread their roots and hold moisture better between waterings. Just make sure your bags are set on well-draining ground and not sitting in direct contact with concrete or hot surfaces.

How to Grow Black Widow Marijuana in Temperate Climates

This potent strain can be successfully grown in temperate climates, but you’ll need to take some extra precautions - especially as you move into late flower when humidity tends to rise and temps start to dip.

If you want a head start in temperate zones, start by germinating seeds indoors in early spring, then transplant outdoors after the last frost, once nighttime temperatures consistently stay above 50°F. Fabric grow bags are ideal for this climate - they improve drainage during rainy spells and help prevent root rot in cooler, wetter conditions. Just be sure your bags are placed on well-draining ground, not sitting directly on concrete or other surfaces that retain cold or moisture.

To manage humidity, water early in the day so excess moisture can evaporate, and lay down a layer of mulch to help regulate soil temperature and moisture retention. Prune the lower branches and thin out inner foliage to improve airflow, and avoid planting near fences or walls that block natural breezes. If rain is expected late in the season, consider using a simple rain cover or greenhouse structure to keep the buds dry and healthy.

Grow Bag Sizes & Spacing:

— 5-gallon bags – 2–3 feet apart

— 10-gallon bags – 3–4 feet apart

— 15-gallon bags – 4–5 feet apart

— 20-gallon bags – 5–6 feet apart

With a little prep and attention to airflow and moisture, this beauty can do really well in a temperate setup.

How to Grow Black Widow Cannabis Indoors

This frosty powerhouse likes a stable environment. Aim for 72-80°F during lights-on hours and keep it around 60-65°F during lights-off. It can handle slight fluctuations, but bigger swings - especially at night - can slow growth or cause stress, particularly during flowering.

During veg, keep humidity between 55-65% to support healthy growth. Once you flip to flower, start dropping it gradually to around 40-45% by mid-flower. This strain produces dense, sticky buds, so lower humidity helps prevent mold or bud rot. A dehumidifier is a smart investment, especially in sealed rooms or humid climates.

Use 5-7 gallon fabric pots - they allow for great root aeration, prevent overwatering, and help regulate temperature. If you’ve got the room and want to go big, 10-gallon pots are also a good choice. It tends to get bushy, so space plants about 18-24 inches apart to allow airflow and light to hit all parts of the canopy. If you’re doing training, a little extra space goes a long way.

If you’re comfortable with training or want to test your skills, Black Widow responds well to topping, low-stress training (LST), and even SCROG setups. Start training early in veg so the plant has time to bounce back before flowering. Training helps increase yields, manage stretch, and open up the canopy for better airflow and light penetration.

This strain gets loud in flower - expect strong, skunky citrus and earthy pine aromas that will fill your space fast. A carbon filter is essential if you’re growing indoors and want to stay discreet. Strong, consistent airflow is key. Use oscillating fans to keep air moving above and below the canopy. This helps strengthen stems, prevents mold and mildew, and keeps temps more even throughout the grow space.

Light absolutely matters! Black Widow does best under strong, full-spectrum LEDs. Most growers run 6500K for veg and switch to 3000K or 3500K for flower, but here at Holi Moli, we actually run 6500K from start to finish and consistently see dense, resin-loaded buds with rich flavor. If you want big yields and top-shelf results, investing in quality lighting is one of the smartest moves you can make.

GET YOUR SEEDS TODAY!