Cronk Bloom 0-5-3 | Flowering Stage Plant Fertilizer
500mL
$10.88
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Cronk Bloom 0-5-3 | Flowering Stage Plant Fertilizer
$10.88
NPK Ratio:
0-5-3
Product Overview
Bloom 0-5-3 is a nitrogen-free flowering fertilizer that delivers elevated phosphorus and potassium for flower initiation, dense bud development, and enhanced resin production. The zero-nitrogen formula prevents vegetative interference during bloom, allowing plants to focus energy entirely on reproductive growth.
Excess nitrogen during flowering promotes unwanted leaf growth, delays maturation, and reduces flower quality. Bloom eliminates this problem while supplying the phosphorus for ATP energy production and potassium for terpene synthesis, sugar transport, and stem strength under heavy flower loads.
Key Benefits
- Zero nitrogen prevents leafy growth that diverts resources from flowers
- Elevated phosphorus (5%) drives flower initiation and energy-intensive bloom development
- Potassium (3%) enhances flower density, resin production, and aromatic compound synthesis
- Fully soluble for soil, coco coir, and hydroponic applications
Ideal For
Growers transitioning plants from vegetative growth to flowering. Gradually increase Bloom while decreasing Grow as plants enter and progress through bloom for optimized stage-specific nutrition.
What's Inside
Guaranteed Analysis: 0-5-3
| Available Phosphorus (P₂O₅) | 5.0% |
| Soluble Potash (K₂O) | 3.0% |
| Magnesium (Mg) | 1.5% |
Derived From:
Magnesium Carbonate, Magnesium Phosphate, Magnesium Sulfate, Phosphoric Acid, Potassium Carbonate, Monopotassium Phosphate, and Potassium Sulfate
How To Use
Bloom 0-5-3
Part of Cronk Nutrients 3-Part Base system and is recommended to be used with Micro and Grow. Delivers essential phosphorus and potassium for explosive flower and fruit production throughout the bloom phase. Use with every feeding throughout the grow cycle.
- Mix in room temperature water (65-72°F / 18-22°C)
- Add AFTER Micro and Grow have been thoroughly mixed
- Use with every feeding from seedling through harvest
- Use lower dosages during vegetative stage to prepare for flowering
- Increase to peak dosages during mid-late flowering for maximum bud development
- Maintain high dosages through week 8 of flowering for optimal yields
- For specific dosages and week-by-week schedule, see Feed Schedules section
⚠️ Mixing Order: Armadillo (if using) → Micro → Grow → Bloom (3rd) → Additives → Monkey Juice (LAST)
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
Bloom 0-5-3 Feed Schedule
Week-by-week dosage for Bloom. Add last in the 3-Part system (after Micro and Grow).
Vegetative Stage
| Week | mL/Gallon | mL/Liter |
|---|---|---|
| Week 1 | 1.25 mL | 0.33 mL |
| Week 2 | 2.5 mL | 0.66 mL |
| Week 3 | 2.5 mL | 0.66 mL |
| Week 4 | 5.0 mL | 1.32 mL |
Flowering Stage
| Week | mL/Gallon | mL/Liter |
|---|---|---|
| Week 1 | 5.0 mL | 1.32 mL |
| Week 2 | 7.5 mL | 1.98 mL |
| Week 3 | 7.5 mL | 1.98 mL |
| Week 4 | 7.5 mL | 1.98 mL |
| Week 5 | 7.5 mL | 1.98 mL |
| Week 6 | 7.5 mL | 1.98 mL |
| Week 7 | 7.5 mL | 1.98 mL |
| Week 8 | 7.5 mL | 1.98 mL |
| Week 9 | 0.0 mL | 0.0 mL |
Compatibility
Compatible Plant Types
Hemp
Vegetables
Fruits
Flowers
Houseplants
High-Value Crops
Compatible Growing Mediums
Soil
Coco Coir
Hydroponics
Soilless Mixes
Compatible Irrigation Styles
Hand Watering
Drip Systems
AutoPot Systems
Bottom Feed
Recirculating Systems
Fertigation
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 is Bloom (0-5-3) and what does it do?
It’s the flowering part of the Classic 3-Part, supplying phosphorus, potassium, and magnesium to drive flower initiation, fruit set, and dense blooms.
Is Bloom good for vegetables and ornamentals?
Yes—great for tomatoes, peppers, squash, flowers, and ornamentals during flowering/fruiting.
How often should I feed Bloom?
Soil: weekly or every other watering. Coco/Hydro: every feed per chart. Always follow the feeding schedule and pH last.
Any quick tips to avoid issues?
Add products one at a time, never mix concentrates together, stir between additions, and always adjust pH last.
What’s the correct mixing order with the 3-Part?
Add Micro first → Grow → Bloom; in RO water add CalMag first, wait 2–5 minutes, then add Micro → Grow. If using Armadillo Armour, it goes first.
Complete Your System
Add these essential products for optimal results throughout your grow.
5-0-1
Micro 5-0-1: Micronutrient Base
Essential calcium and chelated micronutrients for every feeding. The foundation of the 3-Part system.
- Complete micronutrient formula
- Chelated minerals for maximum absorption
- Essential for all growth stages
From $10.88
2-1-6
Grow 2-1-6: Veg Stage Formula
High potassium for strong stems and lush foliage during vegetative growth.
- Optimized for vegetative growth
- High potassium for strong stems
- Balanced nitrogen for lush foliage
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0-1-3
Bud Booster 0-1-3: PK Boost
Extra P and K for bigger, denser buds during peak flowering.
- PK booster for flowering
- Increases bud density and weight
- Zero nitrogen formula
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0-0-1
Sticky Bandit: Terp Booster
Carbohydrate formula for enhanced terpenes, resin, and flavor.
- Carbohydrate and potassium formula
- Enhances terpene production
- Feeds beneficial microbes
From $18.88
Complete Kit
Save 4%
Save with the Complete Kit
Get everything you need in one package and save up to 15%.
3-Part Kit - Micro, Grow, Bloom
Complete 3-part base nutrient system with Micro, Grow, and Bloom. Professional plant nutrition for all growth stages and systems.
- Complete 3-Part Base System
- Adjustable Stage Ratios
- Professional Grade
$29.64
$28.16
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.