Wham Boom

Wham Boom Auto Cannabis Seeds by Anesia Seeds

Wham Boom Auto is an autoflowering feminized cannabis seed from Anesia Seeds that packs a staggering 31% THC into a compact, fast-finishing plant. Bred from Wham crossed with Rainbow Sherbet #54 (RS54) and infused with ruderalis genetics, this indica/sativa hybrid delivers photoperiod-level potency on an autoflowering timeline. The full seed-to-harvest cycle clocks in at just 9–10 weeks, making it one of the fastest routes to genuinely heavy-hitting flower you can grow.

Why Wham Boom Auto Seeds Deserve a Spot in Your Grow Room

Here's the honest truth: most autoflowering strains trade potency for convenience. You get speed and simplicity, but the flower feels like a watered-down version of what a photoperiod plant can produce. Wham Boom Auto breaks that pattern entirely. At 31% THC, it doesn't just compete with photoperiod strains — it outperforms a good number of them. That's not marketing fluff; those genetics from Wham and Rainbow Sherbet #54 are genuinely elite, and the ruderalis backbone keeps the grow cycle short without gutting the cannabinoid profile.

The practical side is just as strong. Plants stay between 70 and 100 cm indoors, so you're not fighting for vertical space in a tent. Outdoors, they'll stretch to around 120 cm — still manageable on a balcony or in a discreet corner of the garden. The full life cycle from germination to chop is 9–10 weeks. That's roughly two months from cracking the seed to trimming sticky, dense buds. For growers running smaller setups or anyone who wants multiple harvests per season outdoors, that speed is a genuine advantage.

And then there's the nose. Wham Boom Auto inherits a terpene profile that smells like a bakery crossed with a citrus grove — sweet vanilla and nut aromas layered over citrus undertones. When you crack a bud open, you get that rich, complex scent that tells you straight away the flower is worth smoking. The one thing to watch: plants this resinous will absolutely stink during the last few weeks of flower. If you're growing indoors without a carbon filter, your neighbours will know about it. Budget for proper extraction and filtration if discretion matters.

How to Grow Wham Boom Auto Seeds

Wham Boom Auto is one of the more forgiving autoflowering strains we've come across. It doesn't need an experienced hand to produce decent results, though experienced growers will push those yields closer to the upper limits. Here's a straightforward approach:

1. Germinate your seeds using the paper towel method or directly in a small pot of moist, light soil or coco coir. Autoflowers don't like being transplanted, so if you're starting in a small container, move them to their final pot within the first week — before the taproot gets established.
2. Plant each seedling in its final container. A 15–20 litre pot works well for most indoor setups. Outdoors, you can go larger — 25–30 litres gives the roots more room and generally pushes yields higher.
3. Set your indoor lights to an 18/6 or 20/4 schedule. Because Wham Boom Auto is autoflowering, it doesn't need a 12/12 flip to trigger flowering. More light hours means more energy for bud production. Keep your light at the manufacturer's recommended distance to avoid bleaching those tops.
4. Feed lightly during the seedling stage. Autoflowers are sensitive to overfeeding early on. Once vegetative growth picks up — usually around week 2–3 — introduce a balanced grow nutrient at half the recommended dose and increase gradually.
5. Switch to bloom nutrients when you see the first pistils appear. Wham Boom Auto transitions to flower on its own, typically around week 3–4 from germination. Boost phosphorus and potassium during this phase to support dense bud development.
6. Monitor humidity closely during the final weeks. Dense, resinous buds like these are prone to mould if relative humidity stays above 50% in late flower. Good airflow and extraction are critical — not optional.
7. Flush with plain water for the last 7–10 days before harvest. This helps clean up the flavour profile, letting those vanilla, nut, and citrus terpenes come through properly in the finished product.
8. Harvest when trichomes are mostly cloudy with a few turning amber. Given the indica/sativa hybrid genetics, harvesting with more cloudy trichomes leans towards a more energetic effect, while more amber pushes it towards a heavier, more sedating finish. A jeweller's loupe or USB microscope is worth the small investment.

Wham Boom Auto vs Other Autoflowering Seeds

Compared to most autoflowering varieties on the market, Wham Boom Auto sits at the top end for THC content. Many popular autos hover around 20–24% THC, which is respectable but noticeably less intense. The 31% figure here puts Wham Boom Auto in rare territory — only a handful of autoflowering genetics from any seed bank reach that level.

The yield potential is the other standout number. Up to 550 g/m² indoors is photoperiod territory. Most autos top out around 400–450 g/m² under optimal conditions. Outdoors, 300 g/plant is solid for a plant that finishes in under 10 weeks. If you're comparing Wham Boom Auto to a standard photoperiod strain, the trade-off is simple: you sacrifice a few weeks of veg time and some height in exchange for a dramatically faster turnaround. For many growers, especially those running perpetual harvests or growing in limited space, that's a trade worth making.

Frequently Asked Questions

Last updated: April 2026