Q
How much ventilation did you run in your greenhouse?
A
I ran continuous low-speed extraction and intermittent roof vents to keep relative humidity around 50–60% during flowering.
Choose seed quantity
Selected:
5 Seeds
£8.00 / seed • You save £13.33
100% Satisfaction Guarantee • Secured Payments
- Steady yield, solid relief.
Undertow
Feminised
Undertow is an indica-dominant hybrid that offers steady, reliable yields and a calming, uplifting effect.
Why choose Undertow?
- Dense resin production
- Reliable 8–10 week finish
- Performs well with training
THC |
18-22% |
CBD |
0.5-1.5% |
Lineage |
Northern Lights x Haze |
Genotype |
Indica dominant hybrid |
Difficulty |
Intermediate |
Flowering |
8-10 weeks |
Height |
Medium-tall outdoors (1.5–2.5 m), compact indoors |
Yield |
Medium to high (approx 450-500 g/m² indoors; larger outdoor with good care) |
Taste |
Earthy, Citrus, Pine |
Seed Type |
Feminised |
Climate |
humid greenhouse conditions |
Effects |
Relaxed, Uplifted, Focused |
Environment |
Indoor and outdoor |
About Undertow
Undertow is a resilient indica-dominant hybrid bred from Northern Lights x Haze. It produces dense, resinous buds with an earthy-pine and citrus profile and suits growers who can manage humidity and canopy structure. The plant flowers in 8–10 weeks indoors and performs well outdoors when sited for good airflow, especially in temperate areas like Suffolk. Medicinally it is used for pain relief, insomnia and anxiety; cultivators should prioritise mildew prevention in humid greenhouse conditions to realise its full potential.
Grow Difficulty:
Growing Undertow rates as intermediate and rewards consistent training and nutrient management. In humid greenhouse conditions you must control airflow and monitor for mildew to avoid crop loss.
Flowering Time:
Flowering usually completes in 8 to 10 weeks under controlled light. Outdoors in Suffolk, plants typically finish by late September to early October.
Yield:
Yield is medium to high when growers manage canopy and nutrient cycles carefully. Outdoor specimens in Suffolk produce generous colas when space and disease control are prioritised.
Height:
Plants develop a medium to tall structure with a pronounced stretch in early bloom. Branching forms multiple strong side colas suitable for topping and LST.
Environment:
Indoors, Undertow responds well to SCROG and topping with predictable node spacing. Outdoors in Suffolk, site selection and airflow are crucial to minimise rot risk.
Climate:
Growing Undertow in Suffolk's humid greenhouse conditions requires vigilant ventilation and regular mildew inspections. With strict humidity control, the strain produces dense, healthy flowers by harvest.
Frequently Asked Questions
Common questions about this strain, covering growth, effects, and suitability for UK conditions.
Help other collectors choose well
Leave a rating, short review, and optional photos.
Customer reviews
Customer photos 0 uploaded
No customer photos yet.
No reviews yet
Be the first to leave feedback for this strain.
Choose seed quantity
Selected:
5 Seeds
£8.00 / seed • You save £13.33
100% Satisfaction Guarantee • Secured Payments