Lettuce Fertilizer 8-15-36 | Chelated Micronutrients | Hydroponics, Soil & Foliar Application
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- $ 24.99
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- $ 24.99
- Regular Price
- $ 24.99
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Lettuce Fertilizer 8-15-36
Unlock the full potential of your leafy greens with our scientifically formulated Lettuce Fertilizer 8-15-36. This premium water-soluble blend delivers the perfect balance of nutrients for lettuce, kale, spinach, microgreens, and over a dozen leafy vegetables. Enriched with essential micronutrients and free from heavy metals, our fertilizer ensures vigorous growth, nutrient-dense harvests, and exceptional flavor in every leaf.
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NPK Formula 8-15-36
The Perfect Balance for Leafy Green Excellence
Complete Micronutrients
Chelated Fe, Mn, Zn, Cu plus B & Mo prevent deficiencies and ensure vibrant, healthy growth
100% Water Soluble
Instantly dissolves for soil drench, foliar spray, or hydroponic systems with no clogging
KEY FEATURES & BENEFITS
- Optimal 8-15-36 NPK: Precisely balanced for leafy green vegetables with high potassium for crisp, flavorful leaves
- Complete Micronutrient Package: Chelated iron, zinc, manganese, copper, plus boron and molybdenum
- Heavy Metal Free: Tested and certified for safe, clean produce
- Versatile Application: Perfect for soil, hydroponic, and foliar methods
- Nutrient-Dense Produce: Enhances vitamin and mineral content in leaves
- Professional Grade: Used by commercial growers worldwide
- Instant Availability: 100% water-soluble for immediate uptake
- pH Stable: Maintains optimal pH for nutrient absorption
SCIENCE BEHIND THE FORMULA
Understanding why our 8-15-36 formula works so well for leafy greens requires looking at the unique nutritional demands of these crops throughout their growth cycle.
The Role of Each Nutrient
Moderate Nitrogen (8%): Leafy greens need sufficient nitrogen for chlorophyll production and leaf development, but too much creates problems. Excessive nitrogen leads to:
- Overly succulent tissues prone to disease
- Reduced shelf life and poor shipping quality
- Bitter flavors and compromised texture
- Increased nitrate accumulation in leaves
Our 8% nitrogen content provides optimal growth without these negative effects.
Enhanced Phosphorus (15%): Phosphorus is critical for leafy greens because it:
- Develops strong, efficient root systems for nutrient uptake
- Enables rapid ATP production for cellular energy
- Supports photosynthesis and sugar transport
- Promotes early establishment and faster maturity
Very High Potassium (36%): Leafy greens are heavy potassium feeders. This essential nutrient:
- Regulates stomatal function and water use efficiency
- Activates over 60 enzyme systems
- Strengthens cell walls for crisp texture
- Enhances disease resistance, especially to fungal infections
- Improves cold tolerance and stress resistance
- Extends post-harvest shelf life significantly
Why Leafy Greens Love High Potassium
Micronutrient Synergy
Our formula includes carefully balanced micronutrients that work synergistically with the NPK ratio:
Chelated Iron (Fe) - 0.10%
Chelated Manganese (Mn) - 0.05%
Chelated Zinc (Zn) - 0.05%
Chelated Copper (Cu) - 0.05%
Boron (B) - 0.02%
Molybdenum (Mo) - 0.0005%
SUITABLE FOR ALL LEAFY GREENS
Our formula is optimized for a wide variety of leafy vegetables:
- Romaine
- Iceberg
- Butterhead
- Leaf Lettuce
- Baby Lettuce Mixes
- Kale
- Broccoli Leaves
- Cabbage
- Collard Greens
- Bok Choy
- Spinach
- Swiss Chard
- Arugula
- Microgreens
- Watercress
DERIVED FROM
APPLICATION RATES & DIRECTIONS
Our Lettuce Fertilizer can be applied through soil, foliar, or hydroponic methods for maximum flexibility.
🌱 Soil Application
| Application Method | Rate | Frequency | Notes |
|---|---|---|---|
| Per Plant | 3 grams (1/2 tsp) | Every 4-6 weeks | Apply around base |
| Broadcast (per 100 sq ft) | 100-200 grams | Every 4-6 weeks | Water in thoroughly |
| Row Application | 2-4 lbs/100 ft row | At planting & mid-season | Side dress 2" from plants |
| Per Acre | 660-1500 lbs | Every 4-6 weeks | Based on plant density |
🍃 Foliar Application
| Concentration | Application Rate | Frequency | Best Time |
|---|---|---|---|
| 0.5-1% Solution | 5-10 g/liter water | Every 1-2 weeks | Early morning/evening |
| Per Plant | 1 gram in 100ml water | Weekly | Avoid hot sun |
| Per Acre | 200-500 lbs in 100 gal | Every 1-2 weeks | Cool, calm conditions |
💧 Hydroponic Application (per 100 gallons)
| Growth Stage | Fertilizer Amount | Cal-Mag Plus | Target pH | Target EC/PPM |
|---|---|---|---|---|
| Seedling/Transplant | 0.25 lbs | 250-500 ml | 6.5-6.8 | 0.8-1.0 EC (560-700 PPM) |
| Vegetative Growth | 0.5 lbs | 500-1000 ml | 6.4-6.7 | 1.5-1.8 EC (1050-1260 PPM) |
| Mature/Harvest | 0.5 lbs | 1000 ml | 6.0-6.5 | 1.8-2.2 EC (1260-1540 PPM) |
Optimal Feeding Through Growth Stages
Quarter strength weekly
+ Cal-Mag 2.5ml/gal
Half to full strength
+ Cal-Mag 5-10ml/gal
Full strength weekly
+ Cal-Mag 10ml/gal
Cut and come again
+ Cal-Mag 10ml/gal
- Fill tank with water to 80% capacity
- Add Cal-Mag Plus first (if using)
- Dissolve fertilizer completely while agitating
- Adjust pH after all nutrients added
- Top off to final volume
- 10-gallon system = ~12 plants
- 25-gallon system = ~30 plants
- 50-gallon system = ~60 plants
- 100-gallon system = ~120 plants
LETTUCE FERTILIZER CALCULATOR
Lettuce Fertilizer 8-15-36 Calculator
Calculate precise amounts for your leafy green production.
🌱 Soil Application Calculator
📋 For garden beds and field production
💧 Hydroponic System Calculator
📋 For NFT, DWC, ebb & flow systems
🍃 Foliar Spray Calculator
📋 For quick nutrient correction
🥬 Individual Plant Calculator
📋 Calculate for specific number of plants
🌾 Commercial Field Calculator
📋 For large-scale lettuce production
Powered by Greenway Biotech, Inc. — Premium fertilizers since 1989
COMPLETE MICRONUTRIENT PROFILE
Our formula includes all essential micronutrients in optimal ratios for leafy greens:
| Micronutrient | Form | Function in Leafy Greens |
|---|---|---|
| Iron (Fe) | Chelated EDTA | Chlorophyll production, prevents yellowing |
| Manganese (Mn) | Chelated EDTA | Photosynthesis, disease resistance |
| Zinc (Zn) | Chelated EDTA | Growth hormones, leaf development |
| Copper (Cu) | Chelated EDTA | Enzyme activation, lignin synthesis |
| Boron (B) | Boric Acid | Cell wall strength, calcium uptake |
| Molybdenum (Mo) | Sodium Molybdate | Nitrogen metabolism, enzyme function |
GROW WITH CONFIDENCE
Below are important details on quality, returns, sustainability, and charitable efforts that set our product apart.
Product Quality Guaranteed
- All our products are manufactured in California, USA
- Tested by independent third-party laboratories for quality assurance
- Registered with the California Department of Food and Agriculture (CDFA)
- Rigorously tested to ensure products are free from heavy metals
Hassle-Free Return Policy
If you're not completely satisfied, we offer a 90-day money-back guarantee. Simply return the unused portion in its original packaging, and we'll process a full refund.
Environmental Responsibility
We're committed to sustainable practices, including:
- Biodegradable packaging materials
- Precise nutrient formulation to reduce runoff
- Support for eco-friendly farming methods
- Ongoing research into organic solutions
Charitable Contributions
1% of all profits go to the Greenway Foundation, focused on improving educational opportunities for children. Learn more at greenway.foundation.
DOCUMENTS
FREQUENTLY ASKED QUESTIONS
Click on each question to see the answer.
Why is 8-15-36 the ideal ratio for lettuce and leafy greens?
The 8-15-36 ratio is specifically formulated for the unique needs of leafy vegetables:
- 8% Nitrogen: Provides adequate leaf growth without excess that causes soft tissue, nitrate buildup, or reduced shelf life
- 15% Phosphorus: Ensures strong root development for efficient nutrient uptake and faster maturity
- 36% Potassium: Very high K is crucial for crisp texture, disease resistance, and extended shelf life
This ratio produces compact, flavorful heads with excellent shipping quality and consumer appeal.
How does this prevent tip burn in lettuce?
Tip burn is primarily a calcium mobility issue, often triggered by environmental stress. Our formula helps prevent it by:
- Moderate nitrogen levels that don't overstimulate growth
- High potassium improves water regulation and calcium transport
- Boron enhances calcium utilization
- Balanced nutrition reduces plant stress
For complete protection, we recommend supplementing with Cal-Mag Plus, especially in hot weather or rapid growth conditions.
Can I use this for baby leaf and microgreen production?
Absolutely! For baby leaf and microgreens:
Baby Leaf (3-4 weeks to harvest):
- Use at 50-75% of standard concentration
- Apply every 5-7 days
- Target EC: 0.8-1.2
Microgreens (7-14 days to harvest):
- Use at 25% concentration after cotyledons emerge
- Single application usually sufficient
- Target EC: 0.4-0.6
The balanced nutrition enhances color, flavor, and nutritional content in these specialty crops.
What's the best application schedule for continuous harvest?
For cut-and-come-again production:
- Initial Growth: Apply at planting/transplanting
- First Harvest: Apply 2-3 days after cutting
- Subsequent Harvests: Apply after each cutting
- Concentration: Use 75% strength for regrowth applications
Pro tips:
- Foliar feed between soil applications for fastest recovery
- Maintain consistent moisture for continuous production
- Alternate with Cal-Mag Plus applications
DISCOVER MORE GARDEN WISDOM
HAVE QUESTIONS?
Check out our full FAQ or contact our support team for personalized advice.
Email: questions@greenwaybiotech.com
CUSTOMER SUCCESS STORIES
"We've been using this fertilizer for our hydroponic lettuce operation for 3 years. The crisp texture and extended shelf life have helped us secure premium restaurant contracts."
"My microgreens have never looked better! The color is vibrant, growth is uniform, and the flavor is outstanding. This formula is perfect for specialty greens."
"Switching to this 8-15-36 formula eliminated our tip burn issues and increased yields by 30%. The high potassium really makes a difference in quality."