Grass-O-Matic is a Spanish autoflower specialist with roots stretching back to the early days of ruderalis breeding in Europe. We stock their feminised autoflowering range, including Sugar Gom and Auto Mass — two strains that show what the bank does best: compact, fast-finishing plants with proper resin production. Small catalogue, focused work.
Grass-O-Matic is a Spanish autoflower specialist with roots stretching back to the early days of ruderalis breeding in Europe. We stock their feminised autoflowering range, including Sugar Gom and Auto Mass — two strains that show what the bank does best: compact, fast-finishing plants with proper resin production. Small catalogue, focused work.
Grass-O-Matic was one of the first European seed banks to take autoflowering genetics seriously, working with ruderalis crosses back when most breeders were still dismissing them as a novelty. The bank sits within the wider Spanish breeding scene and has spent years stabilising lines that finish quickly, stay short, and still produce something worth smoking. Our shelf only carries two of their strains, but both are workhorses that have been in the catalogue long enough to prove themselves.
The range we stock is entirely autoflowering and entirely feminised. Sugar Gom is the sticky-resin pick — an indica-leaning auto that throws trichomes heavily for its size and finishes in a typical autoflower window of around 70 days seed-to-harvest. Auto Mass is the yield pick of the pair, bred for growers who want more weight off a single plant without giving up the convenience of autoflower scheduling. Between them you cover the two reasons most people grow autos in the first place: resin or volume.
If this is your first ever grow, either strain will do the job — autoflowers are forgiving by design because you don't have to manage a light flip, and Grass-O-Matic's genetics are stable enough that you're not gambling on phenotype lottery. Pick Sugar Gom if you have limited space, a small tent, or you're growing on a windowsill or balcony where keeping plants short matters. Pick Auto Mass if you've got a full tent, want one or two plants to fill the footprint, and care more about jar weight than trichome density.
Intermediate growers tend to run Sugar Gom in multiples — three or four plants in 11-litre fabric pots, light defoliation, and a sea-of-green style canopy. It's a strain that rewards leaving the training light; autos don't recover from heavy stress the way photoperiods do, so a gentle hand beats aggressive topping. Auto Mass takes a slightly bigger pot (15 litres is a sensible minimum) and prefers being left to stretch in the first three weeks before you commit to any low-stress training.
For more experienced growers, the appeal of Grass-O-Matic is turnaround time. You can run a full cycle from seed to dry jar in roughly ten to eleven weeks, which means three to four harvests a year from the same tent without ever changing the light timer. That schedule is hard to match with photoperiod genetics. If you've been running photos and want a fast perpetual setup, these are sensible seeds to start with.
Autoflowers don't transplant well, so germinate directly into the final pot if you can. Use a light, airy soil mix — autos hate sitting in heavy, wet medium — and start feeding lightly from week three. Don't push nitrogen the way you would with a photoperiod; the plant simply doesn't have time to recover from a nute burn before flowering kicks in. Keep humidity moderate (around 50–60% in veg, lower in flower) and you'll get the resin Grass-O-Matic is known for.
The two strains we carry — Sugar Gom and Auto Mass — are both feminised autoflowers. Autoflowering is the bank's specialism and what they're best known for in the European market.
Sugar Gom, narrowly. It stays smaller, which makes it easier to manage in a first grow, and the indica-leaning structure means fewer surprises with stretch. Auto Mass is also beginner-friendly but wants a slightly bigger pot to hit its potential.
Both strains sit in the standard autoflower window of roughly 70 days seed-to-harvest, though exact timing depends on your light schedule, pot size, and environment. Running 20/4 light tends to give the fastest finish.
Yes — autoflowers are well suited to outdoor and balcony grows because they don't depend on day length to flower. In northern European climates you can usually get two outdoor cycles per summer if you start the first one early under lights.
Last updated: April 2026
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