
Kush XL Auto
Kush XL Auto seeds. A indica cultivar at 17% THC delivering relaxed, sleepy, happy. Grow figures from named sources.
Royal King Genetics β first-party test batch
Figures below are from our internal seed-lot QC and verified UK grower submissions, not breeder marketing. Determined from a single batch tested 2026-09-01 on 175 seeds.
About Kush XL Auto
Will Kush XL finish outdoors in Britain? Yes, within the April to October season. The habit is compact enough to stay below a fence line, and the dense flower structure puts real weight on a small frame β which is also the reason airflow matters more here than it would in a drier place. Flowering runs 8-10 weeks seed to harvest, which puts harvest in September or October for most of the country.
What yield is realistic? 300-400 g/m2 indoors is achievable with competent LED lighting and attention to feeding. Outdoors, 700 g/plant is realistic in 50 litre pots or in prepared ground with full sun β and "full sun" is doing a lot of work in that sentence at these latitudes, so the position you pick in the garden matters more than the pot you buy. At 17% THC with a myrcene-forward profile, the return on the effort is sound.
Is it forgiving? Reasonably. Anyone comfortable with pH, a feed schedule and a light timer will get a good result. It will not hold your hand, but it will not punish one missed watering either.
Further questions we get asked about Kush XL
Which medium? For flavour, peat-free soil cut with about 30% perlite and amended slowly β fish, blood and bone, rock phosphate, seaweed meal, all of it available at any British garden centre. For weight, coco with fertigation at EC 1.4-1.8 through bloom. This indica performs in both; the choice is about what you want out of it.
How does it handle a British summer? The dense foliage shades itself, which helps. Above 30Β°C growth stalls but the plant does not fold. Mulch the root zone and water before seven in the morning and heat stress stops being a factor in nearly every part of the country. The more common British problem is the opposite one: a cold, wet July that never lets the plant dry out between waterings.
When do I switch to bloom feed? Inside the first week of visible pistils. The 68/32 balance shifts its demand quickly at the transition β phosphorus and potassium up, nitrogen down. Soil growers can top-dress with guano and sulphate of potash; coco and hydro should move to a low-nitrogen bloom formula straight away.
Indoors or outdoors? Both work, for different reasons. Indoors you own the flowering environment completely. Outdoors, across the April to October season, the plant gets a light intensity no domestic LED matches and can reach 700 g/plant β at the price of accepting whatever the autumn does. Flowering: 8-10 weeks seed to harvest. Indoor yield: 300-400 g/m2. Outdoor yield: 700 g/plant. Plant height: 60 cm. Rated intermediate difficulty.
What Kush XL is actually like
Growers report relaxed, sleepy, happy as the defining characteristics and our own notes agree. At 17% THC this indica sits where dose control starts to matter. A single bowl through a vaporiser at 185Β°C gives a manageable physical ease with the head still working, which is what most people want at the end of a day. Push the dose and it moves firmly towards sedation β the reason it tends to become a winter evening cultivar rather than an all-year one. The Myrcene/Humulene pairing leaves earth and faint sweetness on the palate, with fruit at the end.
Best suited to quiet evenings, a film, recovery after exercise, and the hour before sleep.
Terpene breakdown
Primary: Myrcene Β· Secondary: Humulene Β· Tertiary: Linalool. How this profile survives the journey from flower to vapour depends on temperature. Low vaporisation, 180-188Β°C, keeps the humulene and linalool audible over the myrcene base. Run it hotter, or burn it, and the three collapse into one note β pleasant enough, but none of the complexity that made it worth choosing.
Who it suits
Kush XL suits growers with the basics in place. Understand pH, rough nutrient ratios and light cycles before you commit to it; it asks for competence rather than expertise. Autoflowering genetics take the light cycle out of the equation, which suits balcony growers, anyone working around British daylight hours, and anyone who wants the whole thing over quickly. The April to October season accommodates a bloom of 8-10 weeks seed to harvest comfortably for outdoor growers across the country.
Effects
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Strain Data Sheet
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Regular
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Kush XL Auto β Breeder Information
Royal King GeneticsBred and stabilised in-house by Royal King Genetics β our internal breeding team. Every batch is QC'd and germ-tested above 99% before it ships. Read the full breeding process and about page.
Kush XL is our F5 autoflower line. Five rounds of selection have fixed both the autoflower trigger and the purple expression the cultivar is known for. The recessive ruderalis trait demands this depth of work to express uniformly.
Lock the autoflower trait in Kush XL through five generations of selection.
Chosen for purple/dark expression where it shows, dense bud structure and a true indica relaxation profile.
Royal King Genetics breeding facility β pollen from internally selected sibling males of the recurrent parent.