Does anyone know how much to put in per gallon for a Hydroponic setup?

This is for 5 gallons. I have been using this for tomatoes works great. 12 grams of the fertilizer. 12 grams calcium nitrate. 6 grams Epsom salt . You need gram scales. 28 grams in an ounce so not hardly half an ounce

I'm growing tomatoes and peppers in 20 gal. containers, what else do I need to go with this fertilizer?

Calcium nitrate and Epsom salt is all that's needed along with this. If in soil no need for pH down but if you using soiless mediums then just pH down your solution about 1/4 teaspoon to 2mls hope this helps. :)

As side dressing when tomato plant is already producing large tomatoes, how to use? sprinkle on soil or mix in water and pour on soil around root??

Hello, You can use either way. If you would like to use for a liquid application you will need to dissolve 2.5 grams of fertilizer per gallon of water, and then poor onto soil. Depending on the quality of the soil amounts vary, but one gallon of solution should be enough for about 15 to 20 adult tomato plants.

Can you put this straight into the reservoir of wicking tubs?

Hello, You can add it straight to the tubs but we usually recommend dissolving in a bit of water first for easier mixing.

Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

Help Track order

Account Cart

Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

Help Track order

Account Cart

Greenway Biotech, Inc. Tomato Fertilizer 4-18-38 Powder - Water Soluble with Chelated Micronutrients for Tomatoes Peppers Eggplant - Bigger Fruit Better Flavor - Hydroponics or Soil - 1 LB

Product ID: 168588646

Details

Brand
Greenway Inc.
Item Form
Liquid Powder
Item Weight
16 ounces
Liquid Volume
1 quarts
Specific Uses For Product
Hydroponic

🍅4-18-38 NPK optimized for nightshades

💧100% water soluble, clog-free formula

🔬Chelated micronutrients for max uptake

207.74 DT

Duties & taxes included

In stock

Sold byAmazon TunisiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Tunisia.

Secure transaction

Description

🍅 Unlock Bigger, Juicier Fruits with Every Feed!

TRUSTED PURITY SAFETY - Independently tested for heavy metals and CDFA registered for peace of mind and consistent quality.
MICRONUTRIENT POWERHOUSE - EDTA-chelated Iron, Manganese, Zinc, Copper plus Boron & Molybdenum ensure nutrient absorption across pH 4–9.
SEAMLESS HYDRO SOIL USE - Fully dissolves for drip, foliar, NFT, DWC & soil applications—no clogging, no fuss.
VERSATILE FLEXIBLE FEEDING - Adjustable rates for soil or hydroponics, compatible with all irrigation methods for tailored growth.
PRECISION NPK FOR PEAK HARVEST - High potassium (38%) boosts fruit size, flavor & shelf life while low nitrogen (4%) prevents excess foliage.

Greenway Biotech’s 4-18-38 Tomato Fertilizer is a premium, water-soluble powder designed specifically for nightshade crops like tomatoes, peppers, and eggplants. Featuring a high-potassium formula with chelated micronutrients, it enhances fruit size, flavor, and shelf life while supporting strong root and bloom development. Perfect for hydroponic and soil systems, it dissolves completely without clogging and is rigorously tested for purity and safety. Trusted by gardeners since 1989, it delivers flexible application options for professional-grade yields.

Specifications

ASIN	B081ZF2H1B
Best Sellers Rank	#43,013 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #1,170 in Garden Fertilizers
Brand Name	Greenway Biotech, Inc.
Coverage	vegetable gardens
Customer Reviews	4.6 4.6 out of 5 stars (281)
Item Form	Liquid, Powder
Item Weight	16 ounces
Liquid Volume	1 quarts
Manufacturer	Greenway Biotech, Inc.
Mixing Ratio	1/2 teaspoon per gallon of water or 3 grams per plant
Model Number	TB4-18-38
Part Number	Tomato_Parent
Specific Uses For Product	Hydroponic,Hydroponics
Target Species	tomatoes
UPC	619206360483
Unit Count	16 Ounce

Common Questions

Are the products genuine and authentic?+

Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

How long does delivery take and is it reliable?+

Delivery times vary by destination country, typically ranging from 3-9 business days. Each order is fully trackable through our system. We handle all customs clearance and use reliable courier partners for last-mile delivery. You'll receive regular updates about your order status via email and our app.

What is Desertcart? Is it safe to order from?+

Desertcart is an international e-commerce platform operating since 2014. We securely process thousands of orders globally each day. Every product goes through our quality verification process before delivery, and we provide end-to-end order tracking, 24/7 customer support, and a comprehensive returns policy to ensure a safe shopping experience.

How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Farhan Q.

The delivery time was excellent, and the packaging was secure.

2 months ago

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

View all Trustpilot reviews

Shop Global, Save with Desertcart

Value for Money

Competitive prices on a vast range of products

Shop Globally

Serving millions of shoppers across more than 100 countries

Enhanced Protection

Trusted payment options loved by worldwide shoppers

Customer Assurance

Trusted payment options loved by worldwide shoppers.

Desertcart App

Shop on the go, anytime, anywhere.

207.74 DT

Duties & taxes included

In stock

Sold byAmazon TunisiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Tunisia.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Yusuf A.

Fantastic experience overall. Will recommend to friends and family.

1 month ago

Ali H.

Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

1 day ago

View all Trustpilot reviews