
- Dessert terps, serious potency, greenhouse-friendly
Forbidden Runtz
Forbidden Runtz is an indica-dominant hybrid known for sweet candy flavours and a potent, balanced high.
- Sweet candy flavour with a berry finish
- Great greenhouse performer when humidity is controlled
- Balanced cerebral lift with gentle body relaxation
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20-24% |
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<1% |
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Forbidden Fruit x Runtz |
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Hybrid (Indica-dominant) |
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Intermediate |
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8-9 weeks |
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Medium (80-140 cm) |
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Medium-high (up to 500 g/m² indoors) |
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Sweet candy, Citrus, Berry |
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Feminised |
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moist western coastal |
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Euphoric, Relaxed, Focused |
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Greenhouse / Outdoor |
About Forbidden Runtz
Forbidden Runtz is an indica-dominant hybrid bred from Forbidden Fruit and Runtz that delivers sweet candy and berry terpenes with a clear yet relaxing high. It suits greenhouse cultivation in the UK where humidity and temperature can be managed, and responds well to training and attentive canopy management. Growers in coastal regions such as Swansea should prioritise ventilation and dehumidification to avoid bud rot, and can expect medium to high yields with an eight to nine week flowering period. The strain is best grown from feminised seed and favours experienced beginners to intermediate growers willing to manage moisture and pests carefully.
Forbidden Runtz is an indica-dominant hybrid with dense, resinous buds and a dessert-like terpene profile. It produces a compact canopy well suited to trained greenhouse spaces.
THC levels typically sit between twenty and twenty-four percent, offering a distinctly potent experience. The high arrives quickly and can be long-lasting for those unused to strong strains.
CBD content is minimal, generally under one percent, so therapeutic effects are mainly cannabinoid-light. This makes the variety more suited to recreational or symptom-targeted use rather than high-CBD therapy.
The lineage pairs Forbidden Fruit with Runtz for a dessert-forward terpene profile and hybrid vigour. The cross emphasises sweetness and compact bud structure inherited from both parents.
Seeds are offered feminised to simplify cultivation and ensure a high proportion of flowering females. These seeds are stable and express consistent traits across runs.
Under a moist western coastal climate the plant demands attentive mould prevention and good airflow to thrive. Growers with moderate experience will find it manageable if ventilation and pruning are prioritised.
Flowering typically completes in eight to nine weeks under stable conditions. A minority of phenotypes may finish slightly earlier or need an extra week to fully mature.
Yields are medium to high when grown in a controlled greenhouse, and well-fed plants can reach around 500 g per square metre indoors. Outdoor crops in Swansea can produce generous harvests provided late-season rainfall is minimal.
Plants generally remain medium in height with a sturdy central cola and productive side branches. Training methods such as topping and low-stress techniques respond well and improve light penetration.
In Swansea this variety performs particularly well in a greenhouse where humidity and temperature can be moderated. Outdoors in Swansea it can flourish in a dry late summer but requires vigilance against rot.
Growing Forbidden Runtz in Swansea requires extra care because of the moist western coastal climate and the increased risk of bud rot. Practical measures such as dehumidifiers, good ventilation and careful canopy management are essential.
The high begins with a clear, uplifted cerebral buzz that sharpens mood and focus. Over time it settles into a gentle physical relaxation without heavy sedation for most users.
The flavour combines sweet candy notes with citrus zest and a lingering berry finish. Smoke is smooth and leaves a sugary aftertaste on the palate.
Frequently Asked Questions
Common questions about this strain, covering growth, effects, and suitability for UK conditions.
Yes, Forbidden Runtz suits UK greenhouse cannabis growing well if you control humidity and airflow to combat mould common in coastal regions.
Harvest when trichomes are mostly cloudy with some amber for balanced effects, typically late September to early October outdoors in the UK depending on the season.
Prevent mould by maintaining good airflow, keeping RH below 50–55% during late flowering, removing excess foliage and spacing buds to promote drying.
A bloom-focused feed with reduced nitrogen and increased phosphorus and potassium works well, with regular micro-nutrient support to avoid lockouts.
Yes, you can grow from feminised seed in a greenhouse in Swansea but start seeds indoors or in a heated germination area to avoid cold stress early on.
Expect eight to nine weeks after a 12/12 switch for most phenotypes, with occasional plants finishing a week earlier or later.
Watch for aphids, spider mites and thrips as they can exploit stressed plants, and monitor regularly to act early with organic controls if possible.
Many growers flush with plain water for a week or two before harvest to help improve smoke quality and reduce residual nutrients.
Dry slowly to 45–55% RH and then cure in sealed jars, opening daily for a week then less frequently for several weeks to preserve terpenes and smooth the smoke.
Cultivating cannabis remains illegal without a licence in the UK, so ensure you understand local laws and permissions before attempting any grow.
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