Magnum Auto

Where you grow Magnum in Ireland changes the margin rather than the method. The climate is temperate oceanic the whole way across, so the question is not which climate you are in but how much rain and wind you are asking this 49/51 hybrid to flower through — around 750 mm a year in the eastern counties against well over 1,200 mm on the Atlantic seaboard. The balanced genetics is the safer bet outdoors here than either extreme. The 49/51 ratio gives a canopy open enough to dry out between showers while still filling properly, which is the compromise an Irish autumn actually asks for. At 15% THC with caryophyllene dominance, quality holds up whether it is finished in a Wexford garden or a Galway polytunnel.

Indoor cultivators can control their environment regardless of location, but Magnum rewards specific adjustments for Irish conditions. Heat is rarely the constraint indoors here — an Irish summer averages a daily maximum near 19°C and rarely troubles a well-ventilated tent. Damp is. Ambient relative humidity outside the tent sits around 80% for much of the year, so the extraction air you are pulling in is already wet, and a dehumidifier sized for the room rather than the tent is the difference between a clean finish and bud rot. Relative humidity targets: 55-65% in veg, dropping to 40-50% once flowers form. EC targets: 1.0-1.4 during vegetative growth, stepping up to 1.6-2.0 at peak bloom. pH maintained between 5.8 and 6.3 depending on your medium. Electricity is among the dearest in the European Union, so lighting efficiency is a running cost rather than a detail.

Outdoor growers face region-specific challenges. The east and south-east: The driest and brightest part of Ireland, around 750 mm of rain a year and sheltered from the prevailing south-westerlies. This is where an outdoor photoperiod has the best odds. Slugs are the pest that actually costs plants here, not mites — a young transplant can be stripped overnight in June, so collars or gravel around the stem earn their place from the day it goes out. The Atlantic west and north-west: Rain of 1,200 to over 2,000 mm, Atlantic wind and the fewest sunshine hours in the country. Autoflowering genetics are the honest answer here — started at the end of May and harvested in August, the plant is off before the worst of the weather. Wind does more damage than rain: keep plants short, staked and spaced. The midlands and inland border counties: The frost window is the widest in the country at both ends and the ground drains slowly. Plant out in early June rather than late May, and treat mid-September as the harvest deadline rather than early October.

Flowering: approximately 85 days (seed to harvest). Indoor yield: 550-600 g/m2. Outdoor yield: 100-250 g/plant. Plant height: Up to 150 cm. Rated beginner difficulty.

The sensory arc of Magnum unfolds in stages. Initial inhalation at 15% THC brings a warm peppery spice that tingles at the back of the throat. The focused, calm effects emerge within minutes, presenting as a simultaneous head-and-body experience. Mental clarity remains intact whilst the muscles release tension progressively. This dual action makes it adaptable — a lighter dose suits afternoon tasks, a heavier dose transitions seamlessly into evening relaxation. The limonene secondary terpene adds a distinct layer: a mood-elevating brightness that counterbalances any heaviness.

Primary: Caryophyllene · Secondary: Limonene · Tertiary: Myrcene. This particular terpene trio appears frequently in award-winning cultivars and produces a nose that most growers find immediately appealing when jars are first opened after curing. The caryophyllene dominance anchors the aroma, limonene provides mid-range character, and myrcene contributes a subtle background note that distinguishes this strain from others sharing the same primary terpene.

Who grows Magnum successfully? Balcony and back-garden growers in Dublin, Cork and Galway. Rural cultivators wanting a crop that is finished and dry before the autumn weather closes in. Indoor growers with limited headroom in small tents. The autoflowering genetics run on their own internal clock — no light schedule adjustments, no stress about light leaks, and harvest arrives 10-12 weeks after germination regardless of the season. Difficulty is rated beginner, meaning even first-time growers with a basic setup and the willingness to follow a feeding schedule will achieve satisfying results. Delivered nationwide in discreet, unbranded packaging with sourced grow data on every strain page.