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Sticky buds. Loud flavour. Easy grow. Black Runtz Auto brings full-strength THC and candy-sweet terps into a fast, compact plant that practically runs itself. What more do you want?
Black Runtz Auto doesn’t just show up to the party. It kicks the door in with sticky buds, wild flavours, and enough THC to make even veteran smokers blink twice. Sitting comfortably at 25% THC, this strain brings that full-body bliss and fruity sweetness that made its photoperiod parent a household name. But now it's faster, smaller, and a whole lot easier to grow. No need to mess with light cycles or complex feeding charts. This thing just does its job. Whether you’re running a stealth grow indoors or letting it soak up sun on the balcony, Black Runtz Auto delivers punch, polish, and proper yields in no time flat.
Want to stretch the veg phase and sculpt your plants exactly how you like? The Black Runtz photoperiod version gives you that flexibility.
This autoflower is a remix of the legendary Black Runtz, paired with Ruderalis to make it hands-off and cycle-free. Black Runtz itself descends from Gelato and Zkittlez, so you already know it’s packing sweet, loud terps and knockout power. The addition of Ruderalis keeps the flavour intact while giving growers a stress-free timeline. No photoperiod? No problem. Just plant, water, and let nature take it from there.
The high kicks off clean and happy, with an uplifting mental spark that mellows out into full-body comfort. It’s not a couch-locker unless you overdo it, but it’s definitely got that heavy-lidded grin baked right in. Perfect for creative sessions, chill evenings, or just winding down without totally checking out.
flavour-wise, it’s a fruit basket explosion. Think berry chews, tropical candy, and a little sweet spice on the back end. The aroma matches the flavour, and it is loud. Crack a jar and the whole room knows what’s up.
At 25% THC, Black Runtz Auto hits like premium-grade flower. Even seasoned smokers will feel this one. The 0.5% CBD doesn’t get in the way, but it softens the edge just enough to keep things balanced. Strong, but smooth.
The terp profile reads like a who’s who of flavour and effect: Caryophyllene, Limonene, Linalool, Myrcene, and Pinene. Caryophyllene adds a peppery kick, Limonene lifts the mood, and Linalool calms the nerves. Myrcene brings that mellow body feel, while Pinene cuts in with a bit of fresh forest zing. It’s a full-spectrum experience from first sniff to final exhale.
This strain practically grows itself. Perfect for beginners, but still interesting enough for experienced growers. It’s resilient, low-maintenance, and bounces back fast from minor mistakes. As long as you give it decent light and nutrients, it’ll reward you with chunky buds and deep aroma.
Black Runtz Auto is flexible. Indoors, it stays compact at around 80 cm to 110 cm, ideal for small grow tents or discreet setups. Outdoors, it can push up to 150 cm in good conditions, starting from about 110 cm. Thanks to high fungal resistance, it holds up well in mountain climates, cooler temps, or humid areas. It’s a great choice for growers who don’t want to fight the elements.
Quick turnaround is a major win here. You’ll be harvesting in 63 to 70 days from seed. Indoors, yields hit between 450 grams per m2 and 550 grams per m2. Outdoors, expect between 500 grams per plant and 650 grams per plant if you give it some love. For an auto this compact, those numbers are seriously impressive.
If you’re after a fast, flavourful, and hard-hitting auto that doesn’t need babysitting, Black Runtz Auto should be on your list. Order from WeedSeedsExpress and get fresh, feminised seeds backed by a germination guarantee, stealthy shipping, and a team that actually knows what they’re doing. Whether this is your first grow or your fiftieth, you’ll want this one in the jar.
Click here for the full strain description.
| Lineage | Black Runtz X Ruderalis |
| Flowering Type | autoflower |
| Gender | feminized |
| Genotype | Indica dominant |
| Ratio | 20 % Sativa / 60 % Indica / 19 % Ruderalis |
| Grower Profile | Beginner |
| THC | Up to 25% |
| CBD | Up to 0.50% |
| Yield Indoor | Up to 550 gr./m2 |
| Yield Outdoor | Up to 650 gr./plant |
| Height Indoor | Up to 110 cm |
| Height Outdoor | Up to 150 cm |
| Climate | Mountains, Mediterranean, Temperate, Cold, Arid |
| Flowering Time | 63 to 70 days |
| Flavors | Berry, Fruity, Spicy, Sweet, Tropical |
| Terpines | Caryophyllene, Limonene, Linalool, Myrcene, Pinene |
| Effects | Euphoric, Happy, Relaxed, Uplifting |
What does Black Runtz Auto taste and smell like?
Sweet candy and fruity berries with tropical notes, a creamy vanilla touch, and subtle earthy spice. The aroma mirrors the flavour with a rich, dessert-like terpene profile.
What are the effects and typical THC/CBD levels of Black Runtz Auto?
Uplifting euphoria and creative energy that settles into deep body relaxation. THC is typically high (often 20%+), while CBD is generally low. May cause dry mouth and dry eyes.
How long does Black Runtz Auto take from seed to harvest?
Typically about 9–11 weeks from germination to harvest, depending on conditions.
What yields can I expect from Black Runtz Auto?
Indoors up to 500 grams per m2 under optimal conditions; outdoors up to 150 grams per plant in warm, sunny climates. Actual results vary by environment and experience.
Is Black Runtz Auto suitable for beginners?
Yes. It’s considered easy to moderate in difficulty, resilient, and forgiving. As an autoflower, it doesn’t require photoperiod management.
How tall does Black Runtz Auto get and where does it perform best?
Compact to medium stature, making it suitable for small spaces. Performs well indoors and outdoors in warm, sunny conditions and finishes quickly in regions with shorter summers.
Is Black Runtz Auto truly autoflowering and do I need to change the light cycle?
Yes. It flowers automatically regardless of light schedule, so you don’t need to change the light cycle.
What is the genetic background of Black Runtz Auto?
A hybrid from the Runtz lineage combined with ruderalis to introduce the autoflowering trait, resulting in a balanced, dessert‑leaning profile.
Ordering Information
We are one of the few seed banks that still ship to New Zealand, and we have many happy Kiwi customers.
Orders to NZ typically take between 10 & 26 business days.
You can find further details about our ordering conditions related to shipping, payment, and guarantees below.
Our goal is to give you the best experience possible! We ship your order quickly, offer free worldwide shipping, use discreet packaging, and guarantee delivery on all tracked orders.
Free shipping
Delivery without tracking is always free of charge. Free delivery with tracking for orders over 130 NZD
Discreetly packaged
Your privacy matters. Our shipments are super discreet, with no mention of cannabis or seeds anywhere.
Delivery time
You can expect your order within 10 to 25 business days.
Free replacement
In rare cases where your seeds get damaged or lost during shipping, we’ll replace them for free!
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Our seeds have an average germination rate of 96%. To make sure you have a 100% germination rate, we add free seeds with every standard seedpack (Not applicable to 3-packs or BOGO Deals). In case of germination issues, feel free to contact us any time so we can work towards a solution.
Our delivery guarantee applies for all tracked shipments, which are available for almost all countries we deliver to. You can see if we offer tracked shipments to your country on our shipping and delivery page.
While our delivery guarantee is available for tracked shipments only, we ensure to initiate an inquiry for any shipment that fails to reach its destination. We value your input as a customer and will collaborate with you to discuss the remaining alternatives, aiming to reach an agreement on the most favorable resolution.
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