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Helium

Feminised

Helium is a sativa-dominant hybrid with lively citrus and pine notes and moderate to high THC.

Why choose Helium?
  • Uplifting cerebral headspace with light body ease
  • Compact plants suited to limited height spaces
  • Resilient terpene profile with citrus and pine
THC 18-24%
CBD <1%
Lineage Blue Dream x Lemon Haze
Genotype Sativa-dominant hybrid
Difficulty Intermediate
Flowering 8-10 weeks
Height Compact, 80–130 cm indoors
Yield Medium-high (≈400–500 g/m²)
Taste Citrus zest, Pine and herbal notes, Light diesel spice
Seed Type Feminised
Climate humid greenhouse environments
Effects Uplifting cerebral rush, Focused creativity, Gentle physical relaxation
Environment Indoor / greenhouse; sheltered outdoor

About Helium

Helium is a sativa-dominant hybrid bred from Blue Dream x Lemon Haze that offers uplifting cerebral effects and compact, productive plants. It performs well in controlled indoor and greenhouse settings and rewards growers who manage humidity and airflow carefully.

Grow Difficulty:

Under humid greenhouse environments Helium needs vigilant humidity control to prevent mould. It suits growers with intermediate experience who can manage ventilation and canopy airflow.

Flowering Time:

Flowering usually completes in eight to ten weeks depending on the phenotype. Early-finishers are closer to eight weeks while other pheno stretch to around ten.

Yield:

Yield is moderate to generous when plants are kept disease-free and trained. Expect roughly 400–500 grams per square metre in optimised indoor setups.

Height:

Plants remain compact with a strong central cola and well-spaced side branches. Indoor height typically sits between eighty and one hundred and thirty centimetres without extreme training.

Environment:

Indoors in Hampshire Helium responds well to SCROG and mainlining, filling small areas with dense bud sites. Outdoors in Hampshire it prefers a sheltered greenhouse or a sunny wall to reduce wet weather exposure.

Climate:

Growing Helium in Hampshire with humid greenhouse environments requires active dehumidification and constant inspection for bud rot. Keep flowering humidity between 45% and 55% and ensure good air movement to protect yields.

Frequently Asked Questions

Common questions about this strain, covering growth, effects, and suitability for UK conditions.

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Choose seed quantity
Selected: 5 Seeds
£53.33 £40.00
£8.00 / seed • You save £13.33
Accepted payment methods
100% Satisfaction Guarantee • Secured Payments
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Questions & Answers

Customer questions and answers from the Urbanseedbank team. Submit your own question and we’ll respond after review.

5 questions Answered posts are shown first.
Common question Posted by Urbanseedbank Answered
Q
My greenhouse is humid; how do I stop bud rot?
A
Verified answer
Increase ventilation, run a dehumidifier during flowering and thin inner foliage to improve airflow around colas.
Common question Posted by Urbanseedbank Answered
Q
What's the best training for compact growth?
A
Verified answer
Use a shallow SCROG net or low-stress training to spread the canopy without excessive vertical growth.
Common question Posted by Urbanseedbank Answered
Q
How often should I water Helium indoors?
A
Verified answer
Water when the top 2–3 cm of substrate is dry; avoid overwatering which worsens humid conditions.
Common question Posted by Urbanseedbank Answered
Q
When should I switch to bloom nutrients?
A
Verified answer
Begin bloom nutrients at the first signs of pistils to support bud development and resin production.
Common question Posted by Urbanseedbank Answered
Q
How long to dry before curing?
A
Verified answer
Dry slowly for seven to ten days in a cool, dark place with stable humidity before moving to jars for curing.

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