Organic Potassium Supplement (0-0-15)

Stack weight. Ripen right. Strengthen from the inside out.

PuurK is a highly concentrated organic potassium formula designed to give your plants the late-stage support they need to finish strong. From flower stacking to ripening and stress resistance, potassium plays a vital role in final-stage development — and PuurK lets you deliver it cleanly, precisely, and sustainably.

Formulated for purity and performance, this sediment-free liquid potassium supplement is fully soluble and safe for use in soil, coco, hydroponics, or as a foliar spray. It’s the clean, efficient way to push bloom density, enhance ripening, and fortify your crop against environmental stressors.

🌍 Sustainability That Stacks Up

PuurK is crafted with an eco-conscious approach, using natural plant-based sources rather than mined salts or heavy synthetics. Its formulation supports regenerative practices and minimizes environmental impact—so you can grow strong while staying sustainable.

• Derived from renewable plant matter

• Clean, fast-acting, and earth-friendly

• No harsh salts or excess residue

• Built for regenerative growing systems

✅ Why Growers Love It:

• Increases flower density and weight during bloom

• Supports ripening, sugar production, and color development

• Enhances plant strength and resistance to heat, drought, and stress

• Clean, sediment-free formula won’t clog lines or filters

• Organic and eco-conscious – no mined inputs, no synthetics

PuurK gives you the freedom to elevate potassium levels when your plants need it most — without filler nutrients or extra bottles.

🌿 Part of the Complete PuurOrganic Feed Program

PuurK works best as part of the Cronk Nutrients PuurOrganic Feed Program. Use it alongside:

• PuurNitro – for strong vegetative growth

• PuurPhos – for flower initiation and root strength

• PuurBalance – for critical micros and uptake efficiency

• PuurCalMag – to reinforce structural support and prevent deficiencies

Together, these products allow growers to fully control their N-P-K ratios, maximize nutrient availability, and simplify their feeding programs without sacrificing performance.

Stack weight. Push bloom. Finish clean.

Only with PuurK by Cronk Nutrients.

Safe for All Plant Types & Grow Mediums

At Cronk Nutrients, we pride ourselves on creating fertilizers that are compatible with a wide range of plants and growing mediums.

🌎 Compatibility
PuurK is compatible with all grow systems, including:
✔️ Soil
✔️ Soilless mixes (Pro-Mix HP, peat blends)
✔️ Coco coir (Pro-Mix CX, buffered coco)
✔️ Deep Water Culture (DWC)
✔️ Drip irrigation and automated systems
✔️ Living soil and organic no-till beds
✔️ Foliar spray applications

Great for all plant types, including:
🌿 Leafy greens, vegetables, and herbs
🌸 Flowering ornamentals and greenhouse crops
🌱 Potted plants and houseplants
🌾 Turf, lawn, and landscape
🌳 Fruiting trees, vines, and shrubs

Directions

SHAKE BEFORE USE

Dilute the suggested amount as per the chart on the back of the bottle into at least 1 litre of water. Apply once per week or every other watering. Safe to use in conjunction with any other nutrients. Use for the majority of the plant's life.

🌱 How to Use

Hydroponic, Coco, and Soilless Mediums:

• Vegetative / General Feeding: 1.25 mL per L or 5 mL per gallon
• Heavy Bloom / Fruiting Stages: 2.5 mL per L or 10 mL per gallon

Apply once per week or with every feeding.

Soil Grows:

Use 1.25–2.5 mL per L or 5–10 mL per gallon

Feed 1–2 times per week depending on plant needs.

Foliar Spray – Fruiting & Leafy Vegetables, Herbs, Grains, Trees, Vines, Ornamentals:

• Use 15–25 mL per 1 L or 60–100 mL per gallon
• Apply every 1–2 weeks during bloom or as needed

Greenhouse & Potted Plants:

• Use 5–15 mL per 1 L or 20–60 mL per gallon
• Spray to runoff every 7–14 days as needed

🌿 Part of the Complete PuurOrganic Feed Program

PuurK works best as part of the Cronk Nutrients PuurOrganic Feed Program. Use it alongside:

• PuurNitro – for strong vegetative growth
• PuurPhos – for flower initiation and root strength
• PuurBalance – for critical micros and uptake efficiency
• PuurCalMag – to reinforce structural support and prevent deficiencies

Together, these five products allow growers to fully control their N-P-K ratios, enhance nutrient availability, and simplify their feeding programs without sacrificing performance.

Conversions: 1 Teaspoon = 5mL | 1 Tablespoon = 15 mL | 1 Ounce = 30mL | 1 Cup = 240 mL

Guaranteed Analysis

0-0-15

Soluble Potash (K₂O)...........15.0%

Derived From: Durian Shell (Biologically Processed)

Safety Data Sheet

CLICK HERE for a copy of Cronk Nutrients PuurK 0-0-15 SDS

Shipping

Cronk Nutrients' online store ships all over Canada and the United States from Canada & the United States. If your country isn't a standard option, please contact us and we can get a shipping quote. We offer free shipping on any order in North America over $125* We ship via UPS, Purolator, FedEx, Canada Post or from our inventory at either Amazon.ca or Amazon.com. 

All orders are processed within 1 business day. 

Your order will be marked as fulfilled from the moment it’s been boxed up in the warehouse awaiting for the courier to pick it up. Once your order has been fulfilled, you will receive an email with your tracking number. Your tracking details will appear once the courier has processed the package.  CLICK HERE for more information about our shipping policy.