Cronk PuurK 0-0-15 | Organic Potassium Plant Fertilizer
500mL
$18.88
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Cronk PuurK 0-0-15 | Organic Potassium Plant Fertilizer
$18.88
NPK Ratio:
0-0-15
Product Overview
PuurK 0-0-15 is an OMRI-certified organic potassium fertilizer sourced from upcycled durian fruit shells. The concentrated formula supports late-stage flowering, enhances terpene and resin production, and improves plant stress tolerance without mined potash or synthetic salts. Fully soluble for clean performance across all growing systems.
Potassium demand peaks during late flowering when plants synthesize terpenes, sugars, and other quality-determining compounds. Traditional organic potassium sources like wood ash contain insoluble particles and inconsistent nutrient levels. PuurK delivers 15% potassium in a clean, sediment-free solution for precise bloom-stage feeding.
Key Benefits
- 15% potassium from plant-based sources enhances flower density and quality attributes
- Supports terpene synthesis, sugar accumulation, and resin production during ripening
- Upcycled durian shells transform disposal problem into sustainable fertilizer
- OMRI Listed for certified organic production
Ideal For
Organic growers maximizing flower quality during late bloom and ripening phases. Elevate PuurK during the final weeks before harvest when potassium demand peaks for terpene and resin synthesis.
Best Results In
Soil, living soil, and coco coir. While fully soluble and technically hydro-compatible, organic nutrients in DWC/RDWC require more attention to reservoir management and pH stability. New hydro growers should consider the Classic 3-Part system.
What's Inside
Guaranteed Analysis: 0-0-15
| Soluble Potash (K₂O) | 15.0% |
Derived From:
Durian Shell (Biologically Processed)
How To Use
PuurK 0-0-15
Part of the 5-Part PuurOrganic system. Provides clean, organic potassium from upcycled durian shells for bloom density, terpene production, and plant strength. All 5 PuurOrganic products are recommended to be used together for best results. Frequency: Feed 1-2 times per week in soil. In coco, feed with every watering.
- Mix in room temperature water (65-72°F / 18-22°C)
- PuurOrganic Mixing Order: PuurNitro → PuurPhos → PuurK (3rd) → PuurCalMag → PuurBalance
- Frequency: In soil, feed 1-2 times per week. In coco, feed with every watering.
- Gradually increase through vegetative and into flowering
- Peak dosages during weeks 2-7 of flowering for maximum bud density
- Critical for flower density, terpene production, and stress resistance
- For specific dosages and week-by-week schedule, see Feed Schedules section
💡 PuurOrganic Mixing: Armadillo (if using) → PuurNitro → PuurPhos → PuurK (3rd) → PuurCalMag → PuurBalance → Additives → Monkey Juice (LAST)
Best Results In
Soil, living soil, and coco coir. While fully soluble and technically hydro-compatible, organic nutrients in DWC/RDWC require more attention to reservoir management and pH stability. New hydro growers should consider the Classic 3-Part system.
Basic Mixing Instructions
- Start with room temperature water (65-72°F / 18-22°C)
- If using Armadillo Armour, add it FIRST
- Add base nutrients in proper order and mix thoroughly
- Add CalMag after base nutrients (if applicable)
- Add other additives, with Monkey Juice LAST
- Check pH (5.6-6.4 depending on stage and medium)
- Apply to plants - water until 10-20% runoff
Customer Reviews
Feed Schedules & Dosage
Cronk PuurK 0-0-15 | Organic Potassium Plant Fertilizer Feed Schedule
Detailed week-by-week feed schedule available. Part of the 5-Part PuurOrganic system.
OMRI Certified Organic. Use alongside other PuurOrganic products for complete nutrition.
Compatibility
Compatible Plant Types
Hemp
Vegetables
Fruits
Flowers
Houseplants
High-Value Crops
Compatible Growing Mediums
Soil
Coco Coir
Hydroponics
Living Soil
Soilless Mixes
Compatible Irrigation Styles
Hand Watering
Drip Systems
AutoPot Systems
Bottom Feed *
Recirculating Systems
Fertigation
* Bottom Feed Notice: PuurOrganic nutrients may create a biofilm buildup in bottom-feed reservoirs. Regular cleaning is recommended when using bottom-feed systems.
General Mixing Tips
- Use room temperature water (65-72°F / 18-22°C)
- Mix each nutrient thoroughly before adding the next
- Never mix concentrated nutrients together
- Check and adjust pH after all nutrients are mixed
- Store nutrients in cool, dark place away from direct sunlight
Frequently Asked Questions
What does PuurK do ?
It delivers concentrated organic potassium to support bloom density, ripening, sugar production, and overall stress resistance in late-stage growth.
When should I use PuurK?
ll the way through. Use a light dose in veg for resilience and water balance, then increase from pre-flower through finish to drive density, colour, and sugar production.
What’s the correct mixing order with PuurOrganics?
(If using) Armadillo Armour → PuurNitro → PuurPhos → PuurK → PuurCalMag → PuurBalance. Add carbs after bases and microbes last; adjust pH at the end.
Which plants benefit most from PuurK?
Fruiting and flowering crops (tomatoes, peppers, berries, squash) and blooming ornamentals. Use ¼–½ strength in containers/houseplants and scale with demand.
Can I use PuurK with my current base nutrients?
Best practice: run PuurK within the PuurOrganics stack (with PuurNitro, PuurPhos, PuurCalMag, PuurBalance) for balanced NPK+micros. Compatible with other bases (e.g., Classic 3-Part, Bonnie & Clyde) — start ¼–½ strength, monitor EC/plant response, don’t replace your base N or P, and pH last.
How do I know plants need more potassium?
Look for marginal yellowing/browning on older leaves, weak stems, slow fruit swell, or poor bloom performance—often worse in heat or drought. Increase PuurK gradually and monitor EC and plant response.
Can too much potassium cause issues?
Yes—excess K can antagonize Ca/Mg uptake. If you see interveinal chlorosis or brittle growth, reduce PuurK, add/maintain PuurCalMag, and keep pH in range while stepping doses slowly.
Complete Your System
Add these essential products for optimal results throughout your grow.
8-0-0
PuurNitro 8-0-0: Organic N
OMRI Listed organic nitrogen for explosive veg growth.
- OMRI Listed organic nitrogen
- Derived from soybean protein
- Vegetative growth booster
From $21.88
0-12-0
PuurPhos 0-12-0: Organic P
OMRI Listed organic phosphorus for bloom and root development.
- OMRI Listed organic phosphorus
- Derived from pumpkin seeds
- Flowering stage booster
From $17.88
2-0-0
PuurBalance 2-0-0: Organic Micros
OMRI Listed micronutrients with amino acid chelation.
- OMRI Listed organic micronutrients
- Plant protein hydrolysate base
- Chelated trace minerals
From $20.88
Complete Kit
Save 5%
Save with the Complete Kit
Get everything you need in one package and save up to 15%.
PuurOrganics Complete Kit
Ideal for growers seeking a complete organic solution that delivers clean, balanced nutrition from seed to harvest.
- All-in-one organic system
- Promotes fast, balanced growth
- Maximizes quality and yield — no synthetics
$97.40
$92.53
Legal Disclaimer
Important Information for Our Customers
At Cronk Nutrients, we are committed to providing high-quality liquid plant fertilizers suitable for a variety of horticultural applications. Our products are designed for legal and responsible use by home growers and gardening enthusiasts. We do not condone or promote the use of our products for illegal purposes.
Customers are responsible for adhering to their local and state laws regarding plant cultivation. It is the sole responsibility of the customer to ensure compliance with all applicable laws and regulations. Cronk Nutrients will not be liable for any misuse of our products in violation of any laws.
By purchasing our products, the customer acknowledges their obligation to comply with the legal standards set forth in their jurisdiction and agrees to use our products in accordance with these laws. Cronk Nutrients reserves the right to refuse service to anyone suspected of using our products for illegal cultivation.
Thank you for choosing Cronk Nutrients for your plant nutrition needs. Grow with confidence, grow legally.