White Widow XXL
Cannabis seeds
by Barney's Farm
White Widow XXL Cannabis Seeds by Barney's Farm
White Widow XXL is a feminized photoperiod cannabis seed from Barney's Farm that delivers massive yields of resinous, flavour-packed buds. Barney's Farm took the most famous genetics in cannabis history and bred them for sheer output — up to 650g/m² indoors and a staggering 2kg per plant outdoors. If you've grown cannabis before but never grown a White Widow, this is where you fix that.
Choose Your Pack Size
| Pack | Seeds | SKU |
|---|---|---|
| 3-pack | 3 feminized seeds | CSBF0168 |
| 5-pack | 5 feminized seeds | CSBF0169 |
Go with the 5-pack if you want to run a full canopy or keep a couple of seeds in reserve. The 3-pack works fine for a single-plant project or a first run to see how she handles your setup.
Why White Widow XXL Seeds Deserve a Spot in Your Grow Room
White Widow has been circulating since the mid-'90s, and every seed bank worth its salt has taken a crack at it. Barney's Farm — an Amsterdam institution — focused their version on one thing: yield. The "XXL" isn't marketing fluff. Indoor growers regularly pull 650 grams per square metre, and outdoor plants in optimal conditions can push past 2 kilograms each. Those are serious numbers from a strain that stays under 120cm tall.
What makes this particular cut worth your time is the balance between output and manageability. She's not a lanky, unruly sativa that needs constant training and support. White Widow XXL grows compact and sturdy, topping out around 100–120cm indoors. That means she fits comfortably in an 80x80 tent without dominating the vertical space. Novice growers can handle her without feeling overwhelmed, and experienced growers can pack more plants per square metre.
The honest limitation? She's a photoperiod strain, not an autoflower. You need to manage your light cycle — 18/6 for veg, 12/12 to trigger flowering. If you've never flipped a light schedule before, read up on photoperiod growing basics first. It's not difficult, but it does require a timer and some attention. If you want something more hands-off, look at autoflowering varieties from Barney's Farm instead. But if you want control over veg time and the bigger yields that come with it, photoperiod is the way.
White Widow XXL Grow Specifications
| Specification | Detail |
|---|---|
| Seed Bank | Barney's Farm |
| Seed Type | Feminized Photoperiod |
| Genetics | White Widow (Barney's Farm selection) |
| Indoor Height | 100–120cm |
| Indoor Yield | Up to 650g/m² |
| Outdoor Yield | Up to 2kg per plant |
| Flowering Time | 60–65 days |
| Outdoor Harvest | October |
| THC Content | Approximately 20% |
| Flavour Profile | Sweet, fruity, pine, spice |
| Grow Difficulty | Easy to moderate |
Flavour and Effects of White Widow XXL Buds
Once you've dried and cured your harvest, White Widow XXL delivers a flavour profile that's layered without being complicated. The first thing you notice is sweetness — a ripe, fruity quality that sits on the tongue. Behind that comes a resinous pine note and a dry spice on the exhale. It's a classic flavour that works equally well smoked or vaped. Through a vaporiser at around 185–190°C, the fruity terpenes come through cleaner and the spice is more pronounced.
At roughly 20% THC, she's potent but not overwhelming. The effects lean uplifting and energetic — the kind of smoke you can enjoy during the day without being glued to the sofa. She's traditionally been considered a solid session strain, meaning you can come back to her throughout the day without things getting too heavy. That said, 20% THC is still 20% THC. Respect the potency, especially if your tolerance is low.
How to Grow White Widow XXL Seeds
- Germinate your feminized seeds using the paper towel method or directly in a starter plug. Keep the environment warm (22–25°C) and moist. Taproots typically emerge within 24–72 hours.
- Transplant seedlings into their growing medium once the taproot is 1–2cm long. She performs well in soil, coco coir, or hydro. For beginners, a quality organic soil mix keeps things simple.
- Maintain an 18/6 light schedule during the vegetative phase. White Widow XXL stays compact, but you can extend veg time to build a larger canopy if your space allows. Light topping or LST (low-stress training) works well to maximise light penetration.
- Switch to a 12/12 light schedule to trigger flowering. She'll begin showing pistils within the first week or two. Flowering takes approximately 60–65 days from the flip.
- During flowering, watch for heavy bud development. White Widow XXL produces dense, resinous buds that can weigh down branches. Support stakes or a trellis net help prevent snapping, especially in the final two weeks.
- Monitor nutrient levels — she's not a particularly hungry feeder, but she responds well to a balanced flowering nutrient regimen. Watch calcium and magnesium levels if you're growing in coco.
- For outdoor grows, plant out after the last frost and expect to harvest in October. She's resilient against temperature fluctuations and handles cooler autumn nights better than most.
- Harvest when trichomes are mostly milky with a few turning amber. Dry slowly in a dark room at 18–20°C with 55–60% humidity for 7–10 days, then cure in glass jars for at least two weeks.
Complete your grow setup with a propagation kit for germination and a carbon filter to manage odour during flowering — White Widow XXL gets pungent in the final weeks. If you're running a tent grow, pair these seeds with a complete grow kit that includes lighting, ventilation, and a timer for your photoperiod schedule.
Frequently Asked Questions
What does White Widow XXL taste like?
Sweet and fruity up front, with a pine and spice backbone on the exhale. Through a vaporiser, the fruit notes come through more clearly. It's a classic, recognisable flavour — nothing exotic, just properly good.
How tall does White Widow XXL grow indoors?
Expect 100–120cm in an indoor setup. She stays compact during veg but stretches 20–30cm in the first two weeks of flowering. Easy to manage in an 80x80 or larger tent.
How long does White Widow XXL take to flower?
Around 60–65 days from the switch to 12/12 lighting. Outdoor plants are typically ready for harvest in October. Check trichomes with a loupe rather than relying purely on the calendar.
Is White Widow XXL good for beginner growers?
Yes. She's resilient, forgiving with nutrients, and doesn't require advanced training techniques. You do need to manage a photoperiod light schedule, so make sure you have a reliable timer. Beyond that, she's straightforward.
What yield can I expect from White Widow XXL?
Indoor growers can pull up to 650g/m² with proper lighting and nutrition. Outdoor plants in optimal conditions — full sun, good soil, long growing season — can produce up to 2kg per plant. Even modest setups return impressive harvests.
What's the difference between White Widow XXL and White Widow XXL Auto?
This is the photoperiod version — you control when she flowers by changing the light schedule. The auto version flowers on its own timeline regardless of light. Photoperiod gives you more control over plant size and typically higher yields.
Can I grow White Widow XXL outdoors in a cooler climate?
She handles cooler autumn temperatures better than many strains, making her suitable for northern European outdoor grows. She'll be ready by October, so as long as your first hard frost comes after mid-October, you should be fine.
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.