Tomato Fertilizer 4-18-38 | Chelated Micronutrients | Hydroponics, Soil & Foliar Application
- Regular Price
- $ 24.99
- Sale Price
- $ 24.99
- Regular Price
- $ 24.99
- Unit Price
- per
Tomato Fertilizer 4-18-38
Elevate your tomato harvest with our premium water-soluble 4-18-38 formula. This high-potassium fertilizer is specifically designed for tomatoes, peppers, eggplants, potatoes, and other nightshade crops, delivering exceptional fruit development and disease resistance. Enriched with essential micronutrients and completely heavy metal-free, it's the professional choice for both soil and hydroponic growing.
🍅 Quick Access
NPK Formula 4-18-38
The Perfect Balance for Tomato & Nightshade Success
Complete Micronutrients
Chelated Fe, Mn, Zn, Cu plus B & Mo ensure vibrant growth and prevent deficiencies
100% Water Soluble
Instantly dissolves for soil drench, foliar spray, or hydroponic systems
KEY FEATURES & BENEFITS
- Optimal 4-18-38 Ratio: Perfect balance for flowering and fruiting stages of nightshade crops
- Complete Micronutrient Package: Chelated iron, manganese, zinc, copper plus boron and molybdenum
- Heavy Metal-Free: Guaranteed pure ingredients for safe, healthy produce
- Very High Potassium Content: Enhances fruit quality, flavor, and disease resistance
- Versatile Application: Suitable for soil, hydroponic, aeroponic, and foliar feeding
- Promotes Nutrient-Dense Produce: Micronutrients accumulate in fruits for better nutrition
- Professional Grade: Used by commercial growers for maximum yields
- Fast Acting: See results within days of application
SCIENCE BEHIND THE FORMULA
Understanding why our 4-18-38 formula works so well for tomatoes and nightshade crops requires looking at the unique nutritional needs of these plants throughout their growth cycle.
The Role of Each Nutrient
Low Nitrogen (4%): Tomatoes need minimal nitrogen during fruiting to prevent excessive vegetative growth. Too much nitrogen leads to lush foliage but poor fruit production and delayed ripening. Our 4% nitrogen content provides just enough for healthy leaves without compromising fruit development.
High Phosphorus (18%): During flowering and early fruit development, tomatoes have elevated phosphorus demands. This element is crucial for:
- Energy transfer (ATP production)
- Root development and nutrient uptake
- Flower formation and fruit set
- Seed development within the fruit
Very High Potassium (38%): Tomatoes are exceptionally heavy potassium feeders, especially during fruit development. Potassium serves multiple critical functions:
- Regulates water movement and turgor pressure
- Activates over 60 enzyme systems
- Enhances photosynthesis and sugar transport
- Strengthens cell walls for disease resistance
- Improves fruit quality, size, and shelf life
- Reduces blossom end rot incidence
Why Tomatoes 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 NIGHTSHADE CROPS
Our formula is specifically optimized for nightshade family plants and similar crops:
- Beefsteak Tomatoes
- Cherry Tomatoes
- Roma Tomatoes
- Heirloom Varieties
- Grape Tomatoes
- Bell Peppers
- Hot Peppers
- Eggplants
- Potatoes
- Tomatillos
- Goji Berries
- Ground Cherries
- Chayote
- Nipplefruit
- Cucamelons
DERIVED FROM
Premium Quality Sources:
APPLICATION RATES & DIRECTIONS
Below are recommended rates for tomatoes, peppers, eggplants, potatoes, and other nightshade crops.
🌱 Soil Application
| Application Method | Rate | Frequency | Notes |
|---|---|---|---|
| Per Plant | 3g (1/2 tsp) | Every 4-6 weeks | Apply around base |
| Per 100 sq ft | 0.75-1.25 lbs | Every 4-6 weeks | Broadcast evenly |
| Per Acre | 24-38 lbs | Every 4-6 weeks | Through irrigation |
🍃 Foliar Application
| Application Method | Rate | Frequency | Coverage |
|---|---|---|---|
| Per Plant | 1g in water | Every 1-2 weeks | Spray to runoff |
| Per 100 sq ft | 100-150g/gallon | Every 1-2 weeks | Early morning best |
💧 Hydroponic Application (per 100 gallons)
| Growth Stage | 4-18-38 Amount | Cal-Mag Plus | pH Range | EC/PPM |
|---|---|---|---|---|
| Vegetative Growth | 0.5 lbs | 500ml-1L | 6.4-6.6 | 1200 PPM |
| Blooming/Fruiting | 0.5 lbs | 1L | 6.1-6.3 | 1700 PPM |
Optimal Feeding Through Growth Stages
Half strength weekly
+ Cal-Mag 2.5ml/gal
Full strength biweekly
+ Cal-Mag 5ml/gal
Weekly applications
+ Cal-Mag 7.5ml/gal
Weekly applications
+ Cal-Mag 10ml/gal
- 10-gallon system = ~6 plants
- 25-gallon system = ~16 plants
- 50-gallon system = ~32 plants
- 100-gallon system = ~63 plants
TOMATO FERTILIZER CALCULATOR
Tomato Fertilizer 4-18-38 Calculator
Calculate the exact amount needed for your tomatoes, peppers, eggplants, and other nightshade crops.
🍅 Garden Bed Application
📋 Recommended: 0.75-1.25 lbs per 100 sq ft every 4-6 weeks
🌱 Individual Plant Application
📋 Standard rate: 3g (1/2 tsp) per plant every 4-6 weeks
💧 Hydroponic System
📋 Standard rate: 0.5 lbs per 100 gallons (assumes ~63 plants per 100 gallons)
🍃 Foliar Spray Application
📋 Mix 100-150g per gallon for 100 sq ft coverage
Powered by Greenway Biotech, Inc. — Premium fertilizers since 1989
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
- Precise nutrient formulation to reduce runoff
- Support for eco-friendly farming methods
Charitable Contributions
1% of all profits go to our foundation, focused on improving educational opportunities for children.
DOCUMENTS
FREQUENTLY ASKED QUESTIONS
Click on each question to see the answer.
Why is 4-18-38 the ideal ratio for tomatoes and nightshades?
The 4-18-38 ratio is specifically formulated for the unique needs of fruiting nightshade crops:
- 4% Nitrogen: Low N prevents excessive foliage growth that delays fruiting
- 18% Phosphorus: High P promotes strong root development and abundant flowering
- 38% Potassium: Very high K is crucial for fruit development, quality, and disease resistance
Tomatoes are heavy potassium feeders during fruiting. The high K content improves fruit size, sugar content, shelf life, and helps prevent diseases like early and late blight. This ratio ensures plants focus energy on fruit production rather than excessive vegetative growth.
Can I use this fertilizer for all types of tomatoes and peppers?
Yes! This formula is ideal for all nightshade family plants, including:
- Tomatoes: All varieties (beefsteak, cherry, roma, heirloom)
- Peppers: Bell peppers, hot peppers, sweet peppers
- Other Nightshades: Eggplants, potatoes, tomatillos
- Specialty Crops: Goji berries, ground cherries
Adjust application rates slightly - larger plants like beefsteak tomatoes may need 25% more fertilizer than cherry tomatoes.
How do I transition from vegetative to fruiting stage feeding?
Feeding schedule for optimal results:
- Seedling Stage (0-3 weeks): Use half-strength solution weekly
- Vegetative Stage (3-6 weeks): Full strength every 2 weeks
- Flowering Stage: Begin weekly applications when first flowers appear
- Fruiting Stage: Continue weekly, increase Cal-Mag to prevent blossom end rot
Pro tips:
- Watch for first flower clusters as signal to increase feeding
- Foliar feed with half-strength solution during fruit set
- Maintain consistent moisture - irregular watering reduces nutrient uptake
- For hydroponics, increase Cal-Mag during fruiting to prevent calcium deficiency
How does this prevent blossom end rot?
While our formula doesn't contain calcium, the balanced nutrition helps prevent blossom end rot by:
- Low nitrogen prevents excessive foliage that competes for calcium
- High potassium improves water regulation for better calcium transport
- Balanced micronutrients enhance overall plant health
For complete protection, we recommend supplementing with Cal-Mag Plus or Calcium Nitrate, especially during fruiting.
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
"The growth was incredible! I love the growth of my plants, they look so healthy. My tomato plants are thriving!"
"This fertilizer is amazing! My tomato plants are thriving and producing an abundance of flavorful tomatoes. Highly recommend!"
"Our greenhouse operation saw a 40% increase in tomato yields after switching to this formula. The low nitrogen really makes a difference during fruiting."