Top 10 Best Fertilizer For Tomatoes & Cucumbers 2023 [Reviews, Guide & FAQs)

Last Updated on March 9, 2023 by masudalam

This is a complete guide to best fertilizer for tomatoes and cucumbers combinedly in 2023.

In this new guide you will learn:

  • Detailed reviews of Top 10 best fertilizer.
  • Buying guide.
  • Commonly asked question on fertilizer of tomatoes and cucumbers
  • Lots more.

Let’s get started..

Well-nourished tomatoes and cucumbers are the epitome of backyard garden produce which does not occur by accident. It needs a healthy combination of patience, sunshine, soil fertility, and diligence to successfully grow cucumbers and tomatoes. Above all, fertilizers play a major role too.

To grow cucumbers and tomatoes you should fertilize them. A good fertilizer will support the overall growth of your veggies, flowering, disease resistance and fruit development as a whole.

A well-nurtured plant will produce beautiful fruit. But, you need the best fertilizer to achieve that. Selecting the fertilizer for tomatoes and cucumbers needs in-depth exploring. Here, we’ve compiled some of the best fertilizers for tomatoes and cucumbers that might help you to choose best one.

So, have a closer look!

1. Botanicare Cal-Mag And Iron Plant Supplement- 2-0-0

If you want a foliar spray but, at the same time, a fertilizer, then look no further than the Botanicare HGC732110 Cal-Mag Plus fertilizer. You can dilute this formula with one teaspoon for every water gallon. After that, you put your sprayer directly on the leaves of your plants.

This fertilizer does not contain phosphate or phosphorus; however, it includes Calcium with 3.2%, 1.2% of magnesium, and 0.1% of iron, making it an ideal fertilizer for reducing rotting. The HGC732110 Cal-Mag Plus is great for the veggies grown in the hydroponic systems by using it at an equal ratio. Besides, it contains an appropriate blend from other trace minerals made to produce veggies in abundance.


  • It has both Calcium, magnesium, and also trace minerals
  • It assists in preventing rotting and allows abundant fruiting.


  • It must be diluted in water before using

2. Cucumber Fertilizer 8-16-36 Powder 100% Water Soluble

This fertilizer is specially made for your tomatoes and cucumbers. The Cucumber Fertilizer 8-16-36 Powder is fully blended to offer a balanced ratio of Nitrogen, phosphorus, and Potassium to your hydroponic crop. The best thing about this formula is that it ensures a good supply of the chelated micronutrients to ensure your crops are at all times radiant and bears healthy and delicious fruits. You just have to apply this hydroponic fertilizer, then sit back and watch how your tomatoes and cucumbers will produce high-quality veggies.


  • Highly soluble in water
  • Contains micronutrients and minerals
  • Provides a balanced ratio in N-P-K


  • It must be dissolved in water first before you can use it.

3. Osmocote Smart-Release Plant Food, 8 lb.

Do you have potted tomatoes and cucumbers? If yes, the Osmocote Smart-Release fertilizer will do just fine for your plants. For up to 6 months, you can use this fertilizer to nurture your crops. Its formula is fortified with 11 important nutrients. The best thing about this fertilizer is that it works well with other plants.

Each of its granules is coated with a resin that controls any nutritional release to enable plants to get the nutrients they require and when they require them. Every granule has the three main nutrients in 15-9-12 essential for plant nutrition.

The Osmocote works well in both indoor and outdoor plants. For your outdoor plants, sprinkle the fertilizer evenly across the plants. It is advisable to apply this fertilizer to your crops every four months.


  • Works well in both indoor and outdoor plants
  • Its granule has resin
  • It can be used on any crop


  • Slightly costly

4. Down to Earth Organic Vegetable Fertilizer

Small seedlings will not be able to blossom very well for some time, and a good fertilizer that’s balanced comes in handy. The Down to Earth Organic fertilizer is your ticket to get your tender seedlings to a healthy start. It features an NPK formula of 4-4-4, thus beneficial formula to give young plants the boost they require.

Also, this fertilizer contains Calcium, iron, and also magnesium that is made from organic ingredients. This garden fertilizer can be put into the soil to enhance the growth and harvest of your tomatoes and cucumber. Its 5-pound package and a container may treat approximately 100 sq. feet of the garden plants.


  • Contains trace minerals
  • It’s organic


  • Somehow expensive

5. Lilly Miller Morcrop Tomato & Vegetable Food 5-10-10, 16lb

With Lilly Miller fertilizer, you are sure to grow many great-tasting tomatoes and cucumbers. In short, you may use it to grow any vegetable you like. It comprises natural and traditional ingredients blended together to develop a unique fertilizer that offers Nitrogen from 5 different sources.

Morcorp adds a mixture of nutrients that can help plants get a root, giving them a good start. Besides, other nutrients that can help crops to continue growing are also present in the Lilly Miller fertilizer. Minerals are also present since they are very important for your tomatoes and cucumbers.


  • Enhances healthy growth in plants
  • It is used both indoors and outdoors.
  • It does not burn the vegetables
  • Organic


  • Can a time stimulate microorganisms

6. MasterBlend 4-18-38 Tomato & Vegetable Fertilizer

For some time now, the MasterBlend 4-18-38 has been among the most liked fertilizer for most commercial gardeners. With their NPK ratio of 4-18-38, you are sure to have many products from your tomatoes and cucumbers. Due to its unique combination, you must use Magnesium Sulphate and Calcium Nitrate for a good balance.


  • Water-soluble
  • Good for soil gardeners


  • It must be combined with Magnesium sulfate and Calcium Nitrate
  • Highly concentrated

7. Jobe’s Fertilizer Spikes Vegetable and Tomato

Do you know that measuring as well as mixing fertilizers, then spraying them and storing the remaining is all in the past? The Jobe’s 06028 Fertilizer eliminates the time and space-wasting with liquids and granules. You have to do with this fertilizer to place the spikes in your soil, and your plants will stay strong and healthy for eight weeks.

The spikes for this fertilizer offer the required nutrition underground for the plant roots to use it. Actually, this is great for container gardens, in-ground gardens, or raised beds. When the spikes are inserted in the soil around the plant, there will be a slow release of formula, and it can feed the tomato and cucumber plants for a whole 8 weeks.

The best thing about this fertilizer is that the nutrients don’t wash away easily. Its NPK ratio is 6-8-16.


  • Supply nutrients continuously
  • Its mess-free
  • It releases the formula slowly


  • The spike may come crumbled or broken.

8. Dr. Earth Organic Tomato, Vegetable & Herb Fertilizer

This among the best fertilizer for tomatoes and cucumbers which is composed of top-notch human ingredients and feed-grade ingredients while at the same time having proteins, carbohydrates, multi-minerals, carbohydrates, and trace elements. The Dr. Earth Organic 5 Tomato, Vegetable & Herb Fertilizer promotes good quality soils that assist in growing nutritious vegetables.

These organic fertilizer granules are very easy to use and last longer. It’s somehow expensive, but apart from that, it is your choice fertilizer to go for. Despite that, the price is still worth it since it leads to the production of high-quality tomatoes and cucumbers that are very delicious.


  • Enhances healthy soil
  • It’s safe for people and pets too
  • High quality


  • It has a strong smell.

9. Miracle-Gro Shake’ N Feed Tomato, Fruit & Vegetable Plant Food, Plant Fertilizer

This water-soluble fertilizer is the best for your tomatoes and cucumbers. Thanks to its quick water dissolving features, it can be used well in a watering hose, garden feeder, or can.

It comes in a ratio of 18-18-21, which encourages your plants’ root development and strong growth. Above all, it increases the blossoms you’ll get. You just have to dissolve its granules at a rate of 1.5 teaspoons for every 1.5 gallons of water. While using the hose garden feeder to spray, follow the feeder directions.


  • Dissolves faster in water
  • Raises the production of blossoms
  • The formula encourages stronger root development and strong growth.


  • It needs a weekly application for good outcomes
  • Doesn’t contain Calcium

10. Harris Organic Plant Food and Plant Fertilizer, Hydrolyzed Liquid Fish Fertilizer Emulsion Great for Tomatoes and Vegetables, 3-3-0.3, 32oz (128oz (Gallon))

The Harris organic fertilizer shouldn’t miss in your list of best fertilizer for tomatoes and cucumbers. This hydrolyzed liquid fertilizer emulsion stands out among its competitors. It’s a great product for vegetables and promotes faster growth of vegetables and plants, thanks to its traces of minerals and nutrients which are naturally obtained from fish. Surely, this is a superb indoor and outdoor plat fertilizer.


  • It has a good natural texture and flavor
  • It’s good for both indoor and outdoor plants
  • It has traces of minerals as well as micro-nutrients that are obtained from fish naturally.


  • Costly

What to consider when buying the Best fertilizer for tomatoes and cucumbers

a) Healthy Nutrients

Tomatoes and fertilizers require fertilizers with less Nitrogen and more phosphorous or Potassium. For instance, the NPK ratio of 6-8-10 and 4-4-4 is suitable to grow tomatoes and cucumbers since nitrogen content doesn’t surpass the other two nutrients.

You should avoid fertilizers that have higher nitrogen content since it will increase the production of vines and foliage but could hinder the crop from producing tomatoes or cucumbers.

b) Organic or Synthetic

There are two types of fertilizers; organic or synthetic, and you should know the best one to go with. Organic fertilizers have nutrients that are sourced from nature like compost poultry manure, bone meal, and worm castings. Besides, no chemicals are used while creating the product.

Synthetic fertilizers contain non-organic ingredients and may still boost harvests and produce healthy plants. Besides, it’s less expensive than other organic fertilizers.

c) Types of Fertilizer (Granular, Liquid, Water soluble)

You should also consider the type of fertilizer to use. It can either be granular, liquid, or water-soluble. The granular fertilizers resemble tiny pellets and release the nutrients gradually to keep plants healthy for some weeks. They are usually mixed in the soil, where they dissolve slowly. The liquids fertilizers are available in a highly concentrated form where you mix with water before using. It’s then sprayed on the plants and rapidly absorbed by the plants. They also wash out of the soil very fast, leading to frequent feedings.

Conversely, water-soluble fertilizers come in either fine granule or powdered form and are made to dissolve in water quickly. You can stir into the water can or use a garden hose to spray across your plants.

d) Right combination of elements (NPK ratio)

You should also consider the combination of elements available in your fertilizer, which is the NPK ratio. The ratio is made of Nitrogen, Phosphorous, and Potassium. Nitrogen helps in foliage growth, phosphorous with flower, root, and fruit production, and Potassium is responsible for building strong stems and the overall health of your tomatoes and cucumbers. For instance, the ratio 4-6-4 implies that there is a 4% of N, 6% of P, and 4% of K.

e) Know your soil

This is very important before starting your planting time. Check your soil conditions before anything else. If you soil clay, sandy, or loam? What’s its PH? All these are important. Even though basic nutrients like Nitrogen may still be available in your soil, they still might not be in the right amount necessary to grow the tomatoes and cucumbers. So, ensure you conduct a soil test to know the PH of your soil.

Frequently Asked Questions (FAQs)

i. Can tomato fertilizer be used for cucumbers?

Mostly, the tomato fertilizer is just good for the cucumbers. Ensure you know the NPK ratio to ensure that Nitrogen is not high.

ii. What is the best N-P-K ratio for cucumbers

The best NPK ratio is 4-6-4. It should contain low Nitrogen and high phosphorous.

iii. Is liquid fertilizer better than granules?

Yes. Because liquid fertilizers provide your plants with nutrients right away.

iv. Is 20-20-20 fertilizer good for tomatoes?

Yes. It specifically works great while used on heavy feeding crops such as tomatoes.

v. Is liquid seaweed good for cucumbers?

Yes. Liquid seaweed is highly beneficial for cucumber plants. It makes them healthy and blossoms well.

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