Wham Boom
Cannabis seeds
by Anesia Seeds
Wham Boom Cannabis Seeds by Anesia Seeds
Wham Boom is a feminized cannabis hybrid from Anesia Seeds that crosses Wham with RS54 (Rainbow Sherbert #54) to produce a balanced strain with a reported THC content of up to 39%. That's not a typo. With yields reaching 600 g/m² indoors and a staggering 900–1,200 g/plant outdoors, this one delivers on both potency and productivity. If you want seeds that punch well above their weight, Wham Boom belongs on your shortlist.
Wham Boom Genetics and Terpene Profile
Wham Boom gets its firepower from two seriously potent parent strains. Wham brings the raw THC muscle, while RS54 — a Rainbow Sherbert #54 cut — layers in a terpene profile that's genuinely enjoyable to smoke or vape. Crack open a cured bud and you'll pick up warm, soothing aromatics: creamy vanilla on the inhale, followed by nutty undertones that linger. It's the kind of flavour that makes you want to take your time with it, which is good advice given the potency.
As a balanced hybrid, Wham Boom doesn't lean heavily indica or sativa. The initial effect is a surge of motivation and mental clarity — the sort of lift that makes you want to tidy the kitchen or finally reply to those messages. That gives way to a deep, full-body relaxation that settles in gradually. Share it with mates and you're in for a chatty, giggly session. Enjoy it solo and you'll melt into the sofa with a grin. Either way, go slow. At 39% THC, a little goes a long way, and even seasoned smokers should respect the dosage.
Wham Boom Growing Specifications
One thing we appreciate about Wham Boom: it's not a diva in the grow room. This balanced hybrid adapts well to both indoor and outdoor environments, and it doesn't demand expert-level skills to produce a solid harvest. Here's what you're working with.
| Specification | Detail |
|---|---|
| Seed Bank | Anesia Seeds |
| Genetics | Wham x RS54 (Rainbow Sherbert #54) |
| Type | Feminized |
| Phenotype | Balanced Hybrid |
| THC Content | Up to 39% |
| Flowering Time | 9–10 weeks |
| Indoor Height | 100–140 cm |
| Outdoor Height | 160–220 cm |
| Indoor Yield | 600 g/m² |
| Outdoor Yield | 900–1,200 g/plant |
| Seeds per Pack | 5 |
Indoors, Wham Boom stays compact at 100–140 cm, which means it fits comfortably in a standard grow tent without aggressive training. That said, some low-stress training (LST) will help open up the canopy and push those yields closer to the 600 g/m² mark. Outdoors, plants stretch to 160–220 cm and really show off — that 900–1,200 g/plant figure isn't marketing fluff if you give them enough root space, light, and nutrients during the flowering phase.
Indoor vs Outdoor: Which Setup Suits Wham Boom?
Both work well, but the choice depends on your situation and goals. Indoor growers get the advantage of climate control. With a 9–10 week flowering time, you can plan your harvest precisely, and the shorter plant height means you won't need a massive tent. An 80x80 or 100x100 setup with decent lighting will do the job. The resinous buds this strain produces will coat your trimming scissors in trichomes — have some isopropyl alcohol handy.
Outdoor growers, on the other hand, are in for a treat if you've got the space and a warm enough climate. At 160–220 cm, these plants develop substantial canopies, and the yield potential of 900–1,200 g per plant is genuinely impressive. You'll want to support the branches during late flower — those dense, resin-heavy buds get heavy, and a snapped branch in week 9 is heartbreaking. We've seen it happen more times than we'd like.
The one honest limitation: with THC levels this high, Wham Boom can be sensitive to environmental stress during late flowering. Keep humidity below 50% in the final weeks to avoid mould issues in those dense colas. A dehumidifier indoors or good airflow outdoors is worth the investment.
Growing Wham Boom indoors? Pair these seeds with a complete grow tent kit for a controlled environment from seed to harvest. A carbon filter is non-negotiable once those terpenes start filling the room — vanilla and cream sounds lovely until your entire flat smells like a dispensary. A jeweller's loupe or pocket microscope will also help you time the harvest by checking trichome colour.
Why Wham Boom Cannabis Seeds Stand Out
We carry seeds from dozens of breeders, and Anesia Seeds have built a reputation for pushing THC boundaries. Wham Boom is a prime example. At up to 39% THC, it sits at the extreme end of what's commercially available in feminized seed form. For context, most strains marketed as "high THC" sit between 20–28%. Wham Boom nearly doubles the lower end of that range.
But potency alone doesn't make a great strain — if it did, we'd all just smoke concentrates. What makes Wham Boom worth growing is the combination of that extreme THC content with a genuinely pleasant terpene profile and yields that justify the tent space. Getting 600 g/m² indoors from a strain this potent is unusual. Most ultra-high-THC genetics sacrifice yield for resin production, but Wham Boom manages both.
Compared to something like Anesia Seeds' Imperium X, which also pushes extreme THC numbers, Wham Boom offers a more balanced effect profile. Where Imperium X leans heavier on the indica side, Wham Boom's hybrid genetics give you that initial motivational lift before the relaxation kicks in. If you want a strain that's versatile enough for a social evening or a solo wind-down, Wham Boom has the edge.
How to Grow Wham Boom Cannabis Seeds
- Germinate your Wham Boom seeds using the paper towel method or directly in a starter plug. Keep temperatures between 22–26°C and ensure consistent moisture without waterlogging. Taproots typically emerge within 24–72 hours.
- Transplant seedlings into their growing medium once the taproot is 1–2 cm long. Wham Boom performs well in soil, coco coir, or hydroponic setups. Start with a mild nutrient solution — these seedlings don't need heavy feeding early on.
- During the vegetative phase, maintain 18 hours of light and 6 hours of darkness. Apply low-stress training by gently bending and tying down branches to create an even canopy. This maximises light penetration and encourages multiple bud sites.
- Switch to a 12/12 light cycle to trigger flowering. Wham Boom takes 9–10 weeks to finish. Increase phosphorus and potassium in your feeding schedule during this phase, and reduce nitrogen gradually.
- Monitor humidity closely from week 6 onwards. Keep it below 50% to protect those dense, resinous buds from mould. Good airflow around and through the canopy is critical.
- Harvest when trichomes are mostly milky with around 10–20% amber — use a loupe or microscope to check. Dry in a dark room at 18–21°C with 55–60% humidity for 7–10 days, then cure in glass jars for at least 2 weeks for the best flavour development.
Frequently Asked Questions
Is Wham Boom really 39% THC?
Anesia Seeds reports up to 39% THC based on their testing. Actual THC levels depend on your growing conditions, nutrients, lighting, and harvest timing. Even at 30%, this strain hits exceptionally hard. Grow it well and you'll be in the upper range.
Is Wham Boom suitable for beginner growers?
Yes, it's an uncomplicated plant overall. It stays compact indoors and doesn't require advanced techniques to produce a good harvest. Just keep humidity in check during late flowering and you'll be fine. The growing difficulty is low to moderate.
What does Wham Boom smell and taste like?
Expect warm, creamy vanilla on the nose with nutty undertones. The terpene profile is soothing rather than sharp — it's a pleasant smoke or vape that doesn't assault your throat. The flavour really shines through a clean glass piece or dry herb vaporiser.
How long does Wham Boom take to flower?
Flowering time is 9–10 weeks from the switch to 12/12 lighting. This is standard for a balanced hybrid. Outdoor growers in the Northern Hemisphere can expect to harvest around mid to late October, depending on local climate.
What yield can I expect from Wham Boom?
Indoors, expect around 600 g/m² with proper lighting and training. Outdoors, individual plants can produce 900–1,200 g each when given enough space and sunlight. These are strong numbers, especially for a strain with this level of potency.
Is Wham Boom indica or sativa?
It's a balanced hybrid — roughly 50/50. The effects reflect this: an initial uplifting, motivational wave followed by deep physical relaxation. You get the best of both worlds without being locked to the sofa immediately.
How tall does Wham Boom grow?
Indoors, plants stay between 100–140 cm, making them manageable in most tent sizes. Outdoors, they stretch to 160–220 cm. Low-stress training can help control height indoors if space is tight.
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.