Super Lemon Haze

Super Lemon Haze Feminised Seeds by BSF Seeds

Super Lemon Haze is a feminised cannabis seed variety from BSF Seeds that crosses Lemon Skunk with Super Silver Haze to produce an 80% sativa with up to 25% THC and yields reaching 700g/m² indoors. If you've ever cracked open a jar and had the entire room fill with sharp lemon zest and a back note of cracked black pepper — that's SLH. She's been a staple in seed collections for years, and BSF Seeds have put together a version that keeps the classic profile while shaving the flowering time down to just 9–10 weeks. For a sativa of this calibre, that's genuinely quick.

Why Super Lemon Haze Seeds Deserve a Spot in Your Grow Room

The short answer: she delivers sativa-grade potency and flavour without making you wait half the calendar year. Most sativas with this kind of THC percentage — up to 25% — demand 12, 13, sometimes 14 weeks of flowering. BSF Seeds' Super Lemon Haze wraps it up in 9–10 weeks. That's nearly a month shaved off, which matters when you're paying for electricity, nutrients, and patience.

Then there's the yield. Indoors, under optimised conditions with proper lighting, you're looking at up to 700g/m². Outdoors, growers have reported harvesting 1,000–1,200g from a single plant when the climate cooperates. Those aren't numbers you see from every sativa — plenty of lanky Haze varieties give you airy, disappointing colas after months of veg. SLH packs dense, resin-caked flowers onto a branchy frame with short internodal spacing. She looks like she means business.

The honest limitation? She grows like a sativa. That means vertical stretch. If you're working in a tent under 1.8m tall, you'll want to top her early and consider a ScrOG net. Her branchy structure actually makes her a natural fit for Screen of Green — the short internode gaps fill out the screen evenly without much coaxing. But if you just let her run without training in a small space, she'll push into your light. Plan for it.

Aroma and Flavour Profile of Super Lemon Haze

Super Lemon Haze smells exactly how you'd hope she would. The dominant note is sharp, bright lemon — not a vague citrus suggestion, but proper lemon zest, the kind that hits you the moment you open the jar. Underneath that, there's a layer of lime, a whiff of incense, and a peppery bite that lingers in the background. The resin production is heavy: flowers come out sparkling white under a thick trichome blanket, which is where all that terpene intensity lives.

According to research published in Frontiers in Plant Science, subjective experience reports for Super Lemon Haze consistently highlight its distinctive flavour and aroma profile, with free-narrative reports aligning strongly with citrus and spice descriptors (PMC7819481). What you smell in the grow room is what you get in the final product — there's no bait-and-switch with this strain.

If you've grown Amnesia Haze or another classic sativa and found the flavour a bit flat or too earthy, SLH is the antidote. The lemon cuts through everything. Your carbon filter will earn its keep during weeks 6–10 of flower.

How to Grow Super Lemon Haze Seeds

1. Germination: Soak seeds in room-temperature water for 12–24 hours, then transfer to damp paper towels in a warm, dark spot. Taproots typically emerge within 48–72 hours. Move to your chosen medium once the taproot is 1–2cm long.
2. Seedling stage: Keep humidity around 65–70% and temperatures at 22–25°C. Use a light 18/6 schedule. She's vigorous from the start — don't overwater small pots.
3. Vegetative growth: This is where SLH shows her sativa side. She branches aggressively with short internodal distance. Top her at the 4th or 5th node to encourage lateral growth. If running a ScrOG, start tucking branches under the net once they're 5–10cm above it.
4. Flip to flower: Switch to 12/12 when the canopy fills roughly 60–70% of your screen (ScrOG) or when plants reach about half your target final height — she'll stretch during the first 2–3 weeks of flower.
5. Flowering (weeks 1–5): Expect significant stretch. Support branches if needed. Increase phosphorus and potassium in your feed. Humidity should drop to 45–55%.
6. Flowering (weeks 6–10): Buds fatten rapidly. Trichome coverage becomes heavy. Watch for mould in dense colas if humidity creeps above 50%. Flush for the final 1–2 weeks if growing in soil.
7. Harvest: Indoors, expect to chop at 9–10 weeks of 12/12. Outdoors, she's ready in October. Check trichomes with a loupe — mostly milky with 10–20% amber is the sweet spot for a cerebral, uplifting effect.

Super Lemon Haze vs Other Sativa Seeds

If you're weighing up SLH against other sativas in the catalogue, here's how she stacks up in practical terms:

The standout advantage is clear: SLH gives you sativa potency and yield without the sativa wait. Compared to something like a pure Haze that might need 14 weeks of flower, saving 4–5 weeks is significant — especially for indoor growers counting every day of electricity costs. The trade-off? She still grows tall. If you want something compact that finishes in 8 weeks, look at an indica-dominant hybrid instead. But if you want that cerebral, stimulating sativa effect with lemon terps, this is the one we'd point you toward.

Growing Super Lemon Haze: Best Medium and Climate

SLH performs well in soil, coco, and hydro. In our experience, coco with hand-watering or a drip system tends to bring out the best terpene expression and keeps the growth rate aggressive without the complexity of a full hydro setup. Soil is perfectly fine too — she's not fussy — but you'll see slightly slower veg growth compared to coco or hydro.

Climate-wise, she prefers warm, Mediterranean-style conditions: daytime temperatures of 24–28°C, dropping to 18–20°C at night. She handles heat better than most — the Haze genetics give her some resilience there. Outdoors in northern Europe, she'll finish in October, which means you're racing autumn rain. A greenhouse or polytunnel is smart insurance if you're growing above the 50th parallel.

One thing to watch: her dense, resinous flowers can trap moisture in the final weeks. Keep airflow strong around the canopy. A small oscillating fan pointed at the lower canopy does more than most growers realise.

What to Expect from the Effect

At up to 25% THC, BSF Seeds' Super Lemon Haze is potent. The effect is cerebral, stimulating, and uplifting — a classic sativa profile. According to Healthline's strain guide, Super Lemon Haze is listed among sativa strains associated with uplifting mood (Healthline). Research published in PLOS ONE notes that while consumer-facing terms like "sativa" and "indica" are widely used, the chemical profiles underlying these labels are more varied than the simple binary suggests (PMC6396691). In other words, the terpene and cannabinoid combination in your specific phenotype matters as much as the sativa/indica label.

From what we've seen and heard from growers over the years: SLH tends to hit fast and stay cerebral. It's a daytime smoke, not a couch-lock strain. If you're after something that leaves you functional and motivated, this is the profile. If you want heavy sedation, look elsewhere — a Kush or an indica-dominant hybrid would serve you better.

Frequently Asked Questions

Last updated: April 2026