Super Silver Haze
Cannabis seeds
by Greenhouse Seeds
Super Silver Haze Feminised Seeds by Greenhouse Seeds
Super Silver Haze is a sativa-dominant feminised cannabis seed that crosses three legendary genetics — Skunk, Northern Lights, and Haze — into a single, award-stacked hybrid. Bred by Greenhouse Seeds, this strain has collected more Cannabis Cup trophies than most seed banks have strains, and it remains the benchmark sativa hybrid that growers measure everything else against. With 19% THC, a flowering time of 10–11 weeks, and indoor yields pushing 800g/m², these seeds reward patience with genuinely staggering harvests.
How Many Seeds Do You Need?
These feminised seeds come in packs of 3, 5, or 10. If you're running a ScrOG setup with a single tent, 3 seeds gives you enough to select the best phenotype and still have a backup. Growing outdoors with space to spare? The 5-pack is the sweet spot — you'll want multiple plants because the outdoor yields on this strain are absurd (more on that below). The 10-pack makes sense if you're filling a larger room or want to pheno-hunt seriously across several grows.
Super Silver Haze Genetics and Lineage
Super Silver Haze pulls its genetics from three of the most influential cannabis lines ever cultivated: Skunk, Northern Lights, and Haze. The Skunk parentage brings vigour and reliable structure. Northern Lights contributes resin production and a manageable flowering window. The Haze genetics deliver that soaring, cerebral sativa character and the complex terpene profile this strain is famous for. Greenhouse Seeds combined these three into a hybrid that's won the High Times Cannabis Cup three years running — 1997, 1998, and 1999. That's not a fluke; that's dominance.
The result is a plant that leans heavily sativa in its growth pattern — long internodal spacing, stretchy branches, and a flowering period that tests your patience at 10–11 weeks — but delivers yields and resin coverage you'd normally associate with indica-dominant genetics. It's the best of both worlds, provided you've got the vertical space and the calendar to accommodate it.
Super Silver Haze Growing Characteristics
Super Silver Haze develops long, lateral branches that practically beg for training. This strain responds exceptionally well to LST (Low Stress Training) and performs brilliantly in a ScrOG (Screen of Green) setup, where you can spread those branches across a net and expose every bud site to direct light. We'd pick ScrOG over SOG for this one every time — the branching structure is made for it.
| Specification | Detail |
|---|---|
| Seed Bank | Greenhouse Seeds |
| Seed Type | Feminised (photoperiod) |
| Genetics | Skunk x Northern Lights x Haze |
| Dominant Type | Sativa-dominant hybrid |
| THC | 19% |
| Flowering Time | 10–11 weeks |
| Indoor Yield | Up to 800g/m² |
| Outdoor Yield | 1,300–1,500g per plant |
| Outdoor Harvest | Mid-October |
| Available Packs | 3, 5, or 10 seeds |
Indoors, expect yields up to 800g/m² — that's genuinely heavy for a sativa-leaning strain. Outdoors in a temperate climate, this is where Super Silver Haze gets ridiculous. Individual plants can produce 1,300g, with some specimens pushing 1,500g by mid-October. Those aren't typos. The plant simply doesn't stop stacking weight when it has room to stretch and a full season of sunlight.
The honest limitation: 10–11 weeks of flowering is a long wait, especially if you're used to 8-week indica runs. And the stretch during early flower is significant — if you flip to 12/12 with plants already at half your tent height, you'll be fighting the ceiling within a fortnight. Flip early or train aggressively. There's no shortcut around this one.
Super Silver Haze Aroma, Flavour, and Resin
Here's where the sensory experience gets interesting. Super Silver Haze buds can grow to the length of a grown man's forearm — dense, elongated colas absolutely riddled with long white to pale green pistils. The trichome coverage is extraordinary. By late flower, the buds take on a distinctly silvery sheen from the sheer density of resin glands — that's where the "Silver" in the name comes from. Even the sugar leaves are coated, which makes this strain a strong candidate if you're planning to run trim for extracts.
The aroma is genuinely complex and difficult to pin down in a single word. Imagine a sugary berry fruit snack — sweet, almost candy-like — layered over freshly cut pine wood with a sharp, resinous edge. There's a diesel undertone that comes through more when you break the buds apart. According to research published in the journal Molecules (PMC9775512), Super Silver Haze contains notable levels of monoterpenes with documented anti-inflammatory and antioxidant properties in laboratory settings. The terpene profile isn't just about flavour; it's part of what makes this strain's character so distinctive.
Super Silver Haze Strain Effects and THC Profile
At 19% THC, Super Silver Haze sits in a comfortable zone — potent enough to deliver a clear, uplifting sativa effect without immediately overwhelming less experienced users. The onset is typically cerebral and energising, with a physical warmth that builds gradually. According to research compiled by Healthline, sativa-dominant strains like Super Silver Haze are traditionally associated with daytime use due to their stimulating character.
A note on sensitivity: since this strain leans heavily sativa, those who are prone to overstimulation from cannabis may want to approach with respect. According to dosage observations from seed bank grow reports, even a modest amount (around 0.46g) produces noticeable physical warmth and gentle onset effects. The sativa energy can be intense for some — this isn't a couch-lock strain by any measure.
According to a clinical review published in PMC (PMC10308385), THC has been investigated across a range of clinical contexts including appetite stimulation and nausea reduction, though individual responses vary significantly. We mention this for context, not as a product claim — what you're buying here are seeds, and the plant you grow will express its own phenotype within the genetic range Greenhouse Seeds has stabilised.
How to Grow Super Silver Haze Seeds
- Germination: Use the paper towel method — place seeds between moist (not soaking) paper towels on a plate, cover with a second plate, and keep in a warm dark spot at around 22–25°C. Check every 4–6 hours to ensure the towels stay damp. Taproots typically emerge within 24–72 hours.
- Seedling stage: Transfer germinated seeds taproot-down into small pots with light, airy soil or coco coir. Keep humidity high (65–70%) and lighting gentle — 18/6 light cycle under a low-intensity LED or CFL.
- Vegetative growth: Super Silver Haze stretches considerably. Begin LST early by gently bending the main stem and securing it with soft plant ties. If you're running a ScrOG, install your screen at around 40cm above the pot rim and tuck branches under the net as they grow through.
- Flip to flower: Switch to 12/12 when plants reach about one-third of your desired final height — this strain can double or even triple in size during the flowering stretch. Indoors, expect 10–11 weeks of flowering before harvest.
- Feeding: Sativas generally prefer lighter feeding than indicas. Start at 50–75% of your nutrient manufacturer's recommended dose and increase only if the plant asks for it. Watch for nitrogen toxicity (dark, clawed leaves) during early flower.
- Harvest timing: Check trichomes with a jeweller's loupe. For the classic uplifting sativa effect, harvest when trichomes are mostly cloudy with minimal amber. Outdoors in temperate climates, expect to harvest around mid-October.
Super Silver Haze vs Other Sativa Seeds
If you're weighing up sativa options, here's how Super Silver Haze compares to two other popular choices from Greenhouse Seeds' catalogue.
| Strain | Genetics | THC | Flowering Time | Indoor Yield |
|---|---|---|---|---|
| Super Silver Haze | Skunk x Northern Lights x Haze | 19% | 10–11 weeks | Up to 800g/m² |
| Hawaiian Snow | Hawaiian Haze x Neville's Haze x Laos | ~20% | 10–12 weeks | Up to 600g/m² |
| Trainwreck | Mexican x Thai x Afghani | ~21% | 8–9 weeks | Up to 500g/m² |
Trainwreck finishes faster and hits slightly harder on THC, but the yield difference is massive — Super Silver Haze produces up to 300g/m² more indoors. Hawaiian Snow is the purest sativa of the three but takes longer and yields less. For the combination of yield, potency, and proven genetics, Super Silver Haze is still the one we'd recommend to anyone building a sativa-focused grow.
Complete your grow setup: If you're running Super Silver Haze in a ScrOG, pair these seeds with a proper grow tent and ScrOG net. The long branches and heavy colas benefit from support — a trellis net keeps everything spread evenly under the light and prevents branches snapping under their own weight during late flower. A carbon filter is also non-negotiable with this strain; the terpene output is intense and your neighbours will know about it without one.
Why Super Silver Haze Still Deserves a Spot in Your Garden
We've been watching strains come and go since 1999. New genetics drop every month, breeders chase ever-higher THC numbers, and the hype cycle moves fast. Super Silver Haze has outlasted all of it. The reason is simple: it delivers. Three Cannabis Cup wins didn't happen because of marketing — they happened because judges kept coming back to this strain's combination of flavour complexity, resin production, and genuine sativa energy.
The yield numbers alone justify growing it. Up to 800g/m² indoors is exceptional for any strain, let alone a sativa-dominant one. Outdoors, 1,300–1,500g per plant is the kind of harvest that makes you rethink your drying space. The resin coverage — those silvery, trichome-encrusted forearm-length colas — makes it equally valuable for flower and extraction.
The trade-off is time. You need 10–11 weeks of flowering, you need to manage the stretch, and you need vertical space or a solid training plan. If you're after a quick turnaround, look at something indica-dominant. But if you're willing to invest the weeks, Super Silver Haze rewards that patience more generously than almost any other sativa seed on the market. We've seen growers come back to this strain year after year for exactly that reason.
Frequently Asked Questions
Is Super Silver Haze good for beginner growers?
It's manageable but not the easiest first grow. The long flowering time (10–11 weeks) and significant stretch during early flower require planning. If you're comfortable with basic LST and have enough vertical space, go for it. If it's your very first plant, something with a shorter flowering window might build your confidence faster.
What's the best setup for growing Super Silver Haze indoors?
ScrOG, without question. The long lateral branches spread beautifully across a net, and training them horizontally maximises light exposure to every bud site. You'll hit those 800g/m² yields much more consistently with a screen than without one. Start LST early in veg to get the structure right before flipping to flower.
How tall does Super Silver Haze get indoors?
Expect the plant to double or triple in height after you switch to 12/12 flowering. If you flip at 40cm, you could end up with a plant over 120cm tall. Flip early or train aggressively — this strain will fill every centimetre of vertical space you give it.
When should I harvest Super Silver Haze outdoors?
In a temperate European climate, mid-October is the target window. Watch your trichomes with a loupe — mostly cloudy with minimal amber gives you the classic uplifting sativa character. Don't rush it; the last couple of weeks add significant weight and resin.
Why is it called Super Silver Haze?
The "Silver" refers to the extraordinary trichome coverage on mature buds. By late flower, the sheer density of resin glands gives the colas a distinctly silvery, almost frosted appearance — even the sugar leaves are coated. It's one of the most visually striking strains at harvest time.
What does Super Silver Haze smell like?
Complex and layered. The dominant notes are sweet and berry-like — almost like a sugary fruit snack — over a base of freshly cut pine and sharp resin. Breaking the buds apart releases a diesel undertone. A carbon filter is strongly recommended for indoor grows; this strain is not subtle.
Are these seeds feminised or regular?
Feminised. Every seed is bred to produce a female plant, so you won't need to identify and remove males. This makes them straightforward for growers focused on flower production rather than breeding projects.
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.