Amaretto Tarmac Auto (Seedstockers)

Amaretto Tarmac Auto Cannabis Seeds by Seedstockers

Amaretto Tarmac Auto is an autoflowering feminised cannabis seed from Seedstockers that produces dense, resinous sativa-leaning flowers roughly 10 weeks after germination. No light schedule changes, no fuss. Seedstockers crossed their photoperiod Amaretto Tarmac (Amaretto Sour x Apollo Black Cherry) with Apollo Black Cherry Auto to create a strain that practically grows itself. If you want loud, unusual terpenes without the steep learning curve, this is a solid place to start.

Why Growers Choose This Strain

Sativa-dominant autoflowers that finish in 10 weeks and suit beginners are genuinely rare. Most sativa-leaning strains punish new growers — they stretch too tall, they need precise light cycle flips, and they take forever to finish. This cultivar sidesteps all of that. Seedstockers bred the autoflowering genetics from Apollo Black Cherry Auto into this line, so the plants transition from vegetative growth to flowering on their own — roughly 4 weeks of veg, then straight into bloom without you touching a timer.

The photoperiod version of this strain is a proper diva. Lovely results, but she demands attention. This auto version? Pop the seed into decent soil, keep her watered and fed, and she'll handle the rest. We've seen first-time growers pull impressive harvests from autoflowers like this because the plant does the thinking for you. That said, the one honest limitation: autos don't give you the flexibility to extend veg time if something goes wrong early on. If you stunt an auto in week two, she won't recover the way a photoperiod would. So get your soil, pots, and nutrients sorted before you germinate — not after.

What makes this cultivar worth choosing over the dozens of other autos on the market? The terpene profile. We'll get into that below, but "hot tarmac, glazed cherries, and bitter amaretto" isn't something you smell every day. Most auto strains play it safe with generic fruity or diesel profiles. This one genuinely stands out in a tent full of cookie crosses. If you want to buy seeds that deliver something different from the usual catalogue, this is a strong pick.

Growing Specs

The core numbers for this cultivar are a 9–10 week seed-to-harvest cycle, up to 450g/m² indoors, and THC between 20–26%.

Flavour and Aroma Profile

The dominant aromas are hot tarmac, glazed cherry, and dry amaretto bitterness — a combination you won't find in most seed catalogues. The Apollo Black Cherry parentage brings the dark fruit character — think overripe cherries with a slightly fermented edge. The Amaretto Sour side contributes that distinctive nutty bitterness. And the tarmac? That's the wild card. It's an asphalt-like musk that sounds odd on paper but works brilliantly in practice.

According to the European Monitoring Centre for Drugs and Drug Addiction (EMCDDA), cannabis potency and chemical profiles vary significantly across cultivars, which is part of what makes terpene-forward breeding programmes like this one noteworthy. Sesquiterpenes like beta-caryophyllene — common in pepper and spice-forward strains — are among the most available terpenoids in cannabis plants and extracts (PMC, 2020). Strains with this kind of layered, savoury-sweet profile tend to carry a varied terpene load that goes well beyond single-note genetics.

Once dried and cured properly, the buds are dense, frosty with resin, and display bright green colouring with pink and purple hues. They genuinely look as interesting as they smell — proper bag appeal.

How to Grow These Seeds Step by Step

Germination to harvest takes roughly 10 weeks when conditions are dialled in correctly.

1. Germinate your seeds using the paper towel method or by planting directly into moist soil. Autoflowers don't like being transplanted, so start them in their final pot — a 10-15 litre container works well.
2. Use a light, airy growing medium. A good-quality organic soil with perlite mixed in gives the roots room to breathe. This cultivar isn't fussy, but waterlogged roots will slow her down, and with autos you can't afford lost days.
3. Set your light schedule to 18/6 or 20/4 from seed to harvest. Unlike photoperiod strains, autos don't need a 12/12 flip to start flowering — they'll transition on their own after roughly 4 weeks of vegetative growth.
4. Feed lightly during veg. Autos are smaller than photoperiod plants and burn easily on heavy nutrient schedules. Start at half the recommended dose on your nutrient bottle and increase only if the plant looks hungry.
5. Watch for the stretch. When she enters bloom, she can almost double in height, reaching 100-150cm. If you're growing indoors, make sure you've got headroom or be ready to do some low-stress training (LST) early in veg to keep the canopy even.
6. Harvest at around 9-10 weeks from germination. Check trichomes with a jeweller's loupe — you're looking for mostly cloudy with a few amber heads. Dry slowly in a dark room at 18-20 degrees Celsius for 7-10 days, then cure in glass jars for at least 2 weeks.

How This Strain Compares to Other Beginner Autoflowers

The main differentiator versus typical beginner autos is the complex terpene profile combined with sativa-dominant structure and higher THC. Many entry-level autoflowers lean indica — short, bushy, generic fruity smell, done in 8 weeks. This cultivar takes a touch longer at 10 weeks but rewards you with a more complex aromatic experience and those distinctive pink-purple buds.

The trade-off is height. At 100-150cm, she's taller than most autos, which means she needs a bit more vertical space. In a small 60x60 tent, she might crowd you out. We'd pick an 80x80 or larger for this one. If you're after something shorter that still delivers unusual flavour, Seedstockers' Apollo Black Cherry Auto is worth a look — though the terpene complexity isn't quite at the same level.

What to Watch Out For

This strain is genuinely beginner-friendly, but "beginner-friendly" doesn't mean "zero effort." Here are the things we'd flag from experience:

First, don't overwater. This is the number one killer of autoflowers. The plants are smaller than photoperiods, their root systems are more compact, and they sit in wet soil longer. Let the top inch of soil dry out before watering again. Lift the pot — if it's light, water. If it's heavy, wait.

Second, the stretch is real. Seedstockers says these plants can almost double in size when they flip to flower. If you've got a 120cm tent and you start with a 40cm plant, you could be pushing against the lights by week 7. LST in the first few weeks of veg gives you insurance.

Third, with THC levels between 20-26%, this is a potent strain. Dry and cure properly — rushing this step wastes the complex terpene profile that makes this cultivar worth growing in the first place. Two weeks minimum in jars, burping daily for the first week.

Frequently Asked Questions

Last updated: April 2026