Ultraviolet Autoflower

Ultraviolet Autoflower Cannabis Seeds by Samsara Seeds

Ultraviolet Autoflower is a feminized autoflowering cannabis seed from Samsara Seeds that packs Lavender's full aromatic profile into a compact, fast-finishing plant. A hybrid cross of White Dwarf x Skunk and Lavender — then back-crossed to lock in the autoflowering trait — this strain delivers dense, resinous flowers with a sweet tropical nose in just 75 days from germination. If you want Lavender genetics without the fuss of photoperiod lighting schedules, this is your shortcut.

Why Ultraviolet Autoflower Seeds Deserve Your Grow Space

Samsara Seeds built this strain for growers who want flavour-forward genetics in a small footprint. The White Dwarf parentage keeps the plant compact — we're talking a genuinely small plant that won't outgrow a 60x60 tent or a balcony corner. The Lavender side contributes a sweet, fruity aroma loaded with citrus tones and an exotic tropical fragrance that fills the room well before harvest. It's a proper breeding achievement: all the Lavender character, none of the Lavender height.

The growth period is just 14 days before the plant flips into flower on its own. No timer adjustments, no light-cycle stress. From the moment your seed cracks open, you're looking at roughly 75 days to chop day. For indoor growers tight on time or running perpetual harvests, that speed is a genuine advantage over photoperiod Lavender cuts that can stretch to 10+ weeks of flowering alone.

The honest limitation? Yield. At up to 60 grams per plant indoors, Ultraviolet Autoflower isn't going to fill your jars the way a full-sized photoperiod strain would. If maximum weight is your priority, a strain like Auto Blueberry or a photoperiod Lavender will outproduce it. But if you're after quality over quantity — dense nugs with a mango-citrus flavour profile and a relaxing stone — Ultraviolet punches well above its size class. We'd pick this over most generic autoflowers for flavour alone.

Ultraviolet Autoflower Strain Genetics and Specifications

Understanding what's inside the seed helps you plan your grow. Here's what Samsara Seeds has engineered into this strain.

Aroma, Flavour, and What to Expect from the Flower

Ultraviolet Autoflower smells like a tropical fruit bowl left in the sun. The dominant note is mango — sweet, ripe, almost overripe — layered over a citrus base that sharpens the whole profile. There's a floral undertone from the Lavender genetics that rounds it out and stops it from being one-dimensional. When you break open a dried bud, the room fills with that exotic tropical fragrance within seconds. It's not subtle.

The flower structure reflects the White Dwarf influence: compact, dense nugs with tight internodal spacing. These aren't airy, fluffy buds — they're solid little rocks that trim easily and cure well. The resin production is respectable for an autoflower of this size, and the trichome coverage gives the dried flower a frosty appearance that hints at the terpene complexity inside.

The reported effect leans heavily toward relaxation. Samsara Seeds describes the stone as chilling and deeply curative — the kind of thing you reach for after a long day rather than before a social event. That Indica-dominant heritage comes through clearly in the body-heavy, couch-friendly character.

How to Grow Ultraviolet Autoflower Seeds

Autoflowers are forgiving, but a few things will make the difference between 30 grams and 60 grams per plant. Here's the practical rundown.

1. Germination: Soak seeds in water for 12-24 hours, then transfer to damp paper towels in a warm, dark spot (20-25°C). Taproots typically appear within 48-72 hours.
2. Pot selection: Plant directly into the final container — autoflowers don't respond well to transplanting. An 11-15 litre pot with good drainage is the sweet spot. Fabric pots work brilliantly for air-pruning the roots.
3. Light schedule: Run 18/6 or 20/4 from seed to harvest. Ultraviolet Autoflower doesn't need a light-cycle change to trigger flowering — it handles that on its own after roughly 14 days of vegetative growth.
4. Nutrients: Start light. Autoflowers are sensitive to overfeeding, especially in the first two weeks. Use half-strength nutrients during veg, then gradually increase during flower. Watch for tip burn — it's the first sign you've pushed too hard.
5. Training: Low-stress training (LST) works well to open up the canopy and expose lower bud sites to light. Avoid high-stress techniques like topping — the short lifecycle doesn't give the plant enough recovery time. According to research published in Plants, strategic pruning and defoliation can greatly enhance light-use efficiency and optimise flower exposure (PMC11479007).
6. Harvest timing: At around day 70-75 from germination, check trichomes with a jeweller's loupe. Milky white trichomes with 10-20% amber is the standard window for a relaxing effect. Harvesting earlier (mostly milky, no amber) will give a slightly more alert character.

Light Spectrum and Cannabinoid Production

Ultraviolet Autoflower gets its name from the Lavender lineage, not from UV light requirements — but light spectrum does matter for any cannabis grow. According to research published in Molecules, increased concentrations of THC were found with UV-B treatment in both leaf and floral tissues of drug-type cannabis (PMC8489345). Separately, a study in Metabolites found that increased solar UV radiation results in higher CBDA, terpene, and cannaflavin content in hemp varieties (PMC8200639).

Does that mean you need a UV supplemental bar? Not necessarily. A good full-spectrum LED already covers most of the action spectrum. But if you're chasing maximum terpene expression from those Lavender genetics, a modest UV-B supplement during the last 2-3 weeks of flower is worth experimenting with. According to research in Frontiers in Plant Science, a combination of red and UV-A light enhanced plant growth during the vegetative stage (PMC12748683). Just don't overdo it — excessive UV can stress plants and reduce yields rather than boost them.

Ultraviolet Autoflower vs Other Compact Autoflowers

How does Samsara's Ultraviolet stack up against other small autoflowers? Here's a quick comparison based on published strain data.

The standout difference is the aroma. Most compact autoflowers sacrifice terpene complexity for speed and ease. Ultraviolet keeps the full Lavender nose — that mango-citrus-tropical combination isn't something you stumble across in your average quick-finish auto. The trade-off is yield: 60 grams per plant is decent but not chart-topping. If you want bigger harvests from a similarly compact plant, look at strains with Northern Lights or Ruderalis-heavy genetics — but expect a blander smoke.

Frequently Asked Questions

Last updated: April 2026