Cluster BombStrain, Effects, Genetics, Grow Guide & Where to Buy
Cluster Bomb is one of the most-searched cannabis strains in the United States, but the data behind the hype is what holds growers' attention. It is a indica-dominant (79% indica / 21% sativa) testing at roughly 20% THC, with a flowering window of 7-9 weeks under a 12/12 photoperiod. This guide pulls together the lineage, the effects, the grow data, and the practical answer to "where can I buy Cluster Bomb seeds in the USA" in one place.
Cluster Bomb Quick Stats
THC
20%
Indica
79%
Sativa
21%
Autoflower
No
Flowering
7-9 weeks
Difficulty
intermediate
Indoor Yield
2.3 - 2.6 oz/ft² indoors
Outdoor Yield
800 grams
Plant Height
90-140 cm
Cluster BombEffects & Experience
The dominant effects of Cluster Bomb are euphoric, creative, focused, and the experience is more nuanced than a simple high/low/sedating label would suggest. Onset is gradual rather than abrupt, the peak holds for roughly an hour, and the comedown is smooth, which is why this strain shows up in so many "daily driver" lists from experienced consumers.
Growing Cluster Bomb
Growing Cluster Bomb fits shorter outdoor seasons, Pacific Northwest, New England, Great Lakes, where 7-9 week flowering finishes ahead of October rains. Cluster Bomb is photoperiod, which means you control when it flowers by switching from 18/6 (vegetative) to 12/12 (flowering). Most indoor growers veg for 4-6 weeks before the flip. Indoor yields land around 2.3 - 2.6 oz/ft² indoors under quality LED, and outdoor plants given full sun and 5-7 gallon containers reliably produce 800 grams. Expected plant height is 90-140 cm, with intermediate cultivation difficulty. Practical tips that move the needle: maintain canopy airflow with an oscillating fan moving air through the leaves, not just above them, to prevent powdery mildew; and defoliate strategically on day 21 of flower; remove fan leaves blocking interior bud sites without stripping the plant. The most common challenge growers report is over-feeding nitrogen past week 1 of flower, switch to bloom nutrients within 7 days of seeing pistils.
Cluster BombLineage & Genetics
Cluster Bomb is offered in the Royal King Seeds catalog. Read the description on this page as a general profile rather than a guarantee of your specific pack; expect some phenotype variation between packs.
Where to Buy Cluster Bomb Seeds in the USA
Cluster Bomb seeds ship from Royal King Seeds from within the United States. Estimated delivery is approximately 5-7 business days; actual timing varies by destination and carrier.
Cluster Bomb FAQ
Is Cluster Bomb indica or sativa?+
Cluster Bomb is a indica-dominant with a 79% indica / 21% sativa split. The effects lean toward physical relaxation and a calm, settled headspace.
How long does Cluster Bomb take to flower?+
Cluster Bomb flowers in 7-9 weeks once you flip to 12/12 light cycle. Outdoor harvest typically lands in late September to mid-October across most US zones.
What is the THC content of Cluster Bomb?+
Cluster Bomb tests at approximately 20% THC when grown to its potential. Real-world numbers depend on grow conditions, harvest timing, and curing, well-grown phenotypes can land at the high end of that range, while poorly cured flower tests lower.
Is Cluster Bomb good for beginner growers?+
Cluster Bomb is rated intermediate difficulty. Photoperiod genetics give you control over plant size and harvest timing, which means a bit more responsibility for getting the schedule right. Most growers with one harvest behind them handle this strain without difficulty.
Where can I buy Cluster Bomb seeds in the USA?+
Royal King Seeds ships Cluster Bomb seeds from within the United States, with estimated delivery in approximately 5-7 business days. The product page is at https://royalkingseeds.us/cluster-bomb-feminized.