Runtz Auto White Label – Sweet, Compact Autoflower with Heavy Yields

Runtz Auto White Label is a compact, high-yielding autoflowering strain that blends fruity candy flavor with a balanced, uplifting high—ready to harvest in just 8–10 weeks from seed.

Worried your grow space is too small, your schedule too busy, or your skills too green for a top-shelf strain? You’re not alone. Many growers chase legendary genetics like Runtz but get stuck with finicky photoperiod plants that demand perfect timing, constant pruning, and endless patience.

Imagine investing time and cash only to end up with airy buds, weak aroma, or worse—mold from overwatering a plant that stretched too tall. That “here we go again” feeling kills the joy of growing faster than bad soil ever could.

Runtz Auto White Label solves all that. Bred by White Label (Sensi Seeds’ value-focused sister brand), it packs the iconic Zkittlez x Gelato lineage into a resilient, automatic plant that flowers on its own—no light switches, no stress. It’s sweet, potent, and surprisingly productive, even for first-timers.

Why Runtz Auto is your shortcut to connoisseur-quality buds

This isn’t just another autoflower—it’s Runtz, simplified. You get the same dessert-like terpene profile and 20%+ THC as the original, but in a plant that stays under 80 cm (31.50 in) indoors and finishes fast. Whether you’re growing in a closet, on a balcony, or in a full tent, it rewards minimal effort with maximum flavor and resin.

It’s ideal if you want discretion, speed, and that Instagram-worthy purple-tinged bud without the drama. And thanks to its ruderalis backbone, it’s forgiving of minor mistakes—perfect for busy growers who still crave premium results.

Most important features and benefits

• Autoflowering genetics – flowers automatically after 3–4 weeks, no photoperiod changes needed, so you save time and energy.
• Compact size (60–80 cm / 23.62–31.50 in indoors) – fits discreetly in small tents or stealthy outdoor corners without sacrificing yield.
• Heavy indoor yields (500 g/m² / 16.40 oz/ft²) – delivers dense, resin-coated buds that punch above their weight class.
• 20%+ THC with low CBD – offers a euphoric, creative lift followed by gentle body relaxation—ideal for evening wind-downs without couch lock.
• Fruity-candy aroma (limonene, myrcene dominant) – smells like tropical berries and sweet cream, making every puff a sensory treat.
• Resistant and beginner-friendly – tolerates minor nutrient or watering errors, so you’re less likely to lose your crop to rookie mistakes.
• Fast total cycle (70–90 days) – go from seed to harvest in under 10 weeks, letting you run multiple grows per season.

Typical objections and clear answers

Let’s clear the air on common doubts:

• You think that autoflowers are weak or low-yielding. In reality, Runtz Auto produces up to 500 g/m² indoors—on par with many photoperiods—thanks to modern breeding.
• You think it’s too smelly for stealth grows. In reality, while fragrant in late flower, its compact size makes it easy to manage with a carbon filter or by growing in a well-ventilated outdoor spot.
• You think training is impossible. In reality, light Low-Stress Training (LST) is safe and effective—just avoid aggressive topping or supercropping after week 3.
• You think the flavor won’t match the original Runtz. In reality, lab-backed terpene profiles confirm it inherits the same sweet, fruity, creamy notes that made the strain famous.

How to use it safely and effectively

Follow these steps for a smooth, high-yield grow from seed to jar:

1. Start seeds in a quality autoflowering starter kit with moist paper towels or root cubes at 22–25°C (71.6–77°F) and high humidity.
2. Transplant directly into a final 20 L (5.28 gal) pot with light, airy soil—avoid re-potting later, as autos hate root disturbance.
3. Provide 20 hours of light daily (LED or HPS) from day one; no need to switch schedules.
4. Water lightly but frequently, letting the top 2 cm (0.79 in) dry between sessions to prevent overwatering.
5. Use a balanced organic feed like Complete Biobizz Outdoor Kit at half strength—autos are sensitive to nutrient burn.
6. Support heavy colas with soft ties if growing outdoors, especially in windy areas.
7. Flush with plain water for 7–10 days before harvest when trichomes turn milky-white with amber hints.

Technical specifications

• Breeder: White Label (by Sensi Seeds)
• Type: Autoflowering, feminized
• Dominance: 70% Indica / 30% Sativa hybrid
• Genetics: Runtz (Zkittlez x Gelato) x Ruderalis
• Total cycle: 70–90 days from seed to harvest
• Indoor yield: 500 g/m² (16.40 oz/ft²)
• Outdoor yield: 150 g/plant (5.29 oz/plant)
• Indoor height: 60–80 cm (23.62–31.50 in)
• Outdoor height: up to 1.00 m (3.28 ft)
• Difficulty: Low – ideal for beginners
• Structure: Compact, bushy, short internodes, strong central cola
• Ideal climate: Temperate to Mediterranean; thrives in warm, sunny summers
• Resistance: Good resistance to common pests and mildew; avoid overwatering
• Training: Suitable for gentle LST only; avoid topping or defoliation after week 3
• Recommended pot: 18–27 L (4.76–7.13 gal) final container from start
• Light: 20/4 or 18/6 throughout entire cycle
• Temperature: Veg & flower: 20–26°C (68–78.8°F)
• Humidity: Seedling: 60–70%; Veg: 50–60%; Flower: 40–50%
• pH (soil): 6.0–6.5
• Smell in grow: Medium-high in late flowering—use carbon filtration indoors
• THC: ~20% or higher
• CBD: Low (
• Aromatic profile: Dominant terpenes: limonene, myrcene, caryophyllene
• Flavor: Sweet tropical candy, creamy berry, citrus zest
• Effect: Balanced euphoria and relaxation—great for creative evenings or social chill

Frequently Asked Questions

Can I grow Runtz Auto outdoors in a cooler climate?

Yes, but start in late spring after frost risk passes. It prefers warm, sunny conditions but can handle temperate summers if protected from heavy rain and wind.

Do I need a carbon filter for indoor grows?

Recommended. While not overpowering early on, the aroma intensifies in the last 2–3 weeks of flowering—especially in enclosed spaces.

How many plants per m² for best results?

9–16 plants/m² (0.84–1.49 plants/ft²) in 11–20 L pots using SOG (Sea of Green) works well due to its compact, uniform structure.

Is it safe to use bloom boosters like Budbastic Explosion?

Yes, but use at 50% strength. Autos are sensitive—overfeeding causes nutrient burn. Start in week 4 of flowering and stop by week 7.

Personal Experience of Pevgrow’s CEO (Alan)

I’ll admit I was skeptical at first—could an auto really capture the magic of Runtz? But after growing three batches in my home tent, I’m sold. The flavor is uncanny: like vaping a bag of sour gummies with a creamy finish. I run mine under a 20/4 light cycle in 20L fabric pots with light soil, and I only do minimal LST to open the canopy. No defoliation, no stress. By week 7, the buds are dripping in trichomes with those gorgeous purple hues. My biggest tip? Don’t overfeed. I use half-dose organics and flush early. The high is perfect for Friday nights—happy, relaxed, but still clear-headed enough to enjoy music or a movie. For the price and ease, it’s one of the best autos I’ve ever grown.