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Can you Use Tomato Fertilizer on Other Plants? Here’s How

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Tomato fertilizer ensures optimal growth, robustness, and a rich harvest. But can the product also be used for other plants?

Tomato fertilizer can be used on other plants. Tomato plants are heavy consumers, so the dosage of fertilizer is correspondingly high. Plants that are also heavy feeders tolerate the same fertilizers as this nightshade family plant. Pumpkins, aubergines, savoy cabbage, cucumbers, peppers, and courgettes can be fertilized with tomato fertilizer.

In this article, we are going to explain different aspects of tomato fertilizer.

We will briefly discuss what nutrients tomato fertilizers have, the different brands of tomato fertilizers, and the effects of tomato fertilizers on garden plants and house plants.

What Nutrients Does Tomato Feed Contain?

Tomato fertilizer

Tomato fertilizer contains a combination of potassium, phosphorus, calcium, and magnesium. Tomato plants use these nutrients to grow healthy fruit and vegetable plants.

Two different types of fertilizers are in use:

  1. Mineral-based products such as saltpeter, lime, and blue grain.
  2. Organic fertilizers contain organic components such as manure, bones, or food waste.

Mineral-Based Tomato Fertilizers

Mineral tomato fertilizers usually contain potassium. This ensures a good fruit set, good taste, a solid red color, and rapid growth and strengthens the plant’s defenses. 

Phosphate, sulfur, magnesium oxide, and nitrogen are other ingredients in mineral fertilizers. The advantage of mineral fertilizers is that the plant can absorb them immediately.

Organic Fertilizers

Organic fertilizers are biologically more compatible than mineral ones and put less strain on the soil. 

Furthermore, horse manure, coffee grounds, mature compost, nettle suds, and the like are easy on the wallet. 

In contrast to mineral fertilizers, organic substances must first be activated by soil organisms in order to be usable by the plant.

Organic and mineral fertilizers are available in various forms in specialist shops. The choice is made according to personal preferences, whether as liquid fertilizer, sticks, tablets, or spherical form.

How to Use Tomato Feed on Other Plants?

Using tomato fertilizers on other plants is a bit tricky thing, but you can make it easy by considering some important tips. These are the tips:

Quantity to Use

The quantity of tomato fertilizer used for other plants depends on the plant’s nutrient needs. The number of nutrients that a plant needs will vary depending on the soil and weather conditions, as well as the size and age of the plant.

The best way to get an accurate estimate is to take a sample of your soil and water it with a dilution cup or trowel. After giving it a few minutes to absorb water, remove it from the cup and measure its weight. 

Next, check your garden’s pH level with a pH meter. If it’s too high or too low, adjust accordingly by adding lime or sulfuric acid to your soil until it has the proper PH balance.

To test the moisture and pH of the soil, you can use the cost-effective Trazon Soil 3-in-1 Meter. It tests for not only pH but also moisture content and light intensity. You can find it by clicking here!

Trazon Soil pH Meter 3-in-1 Soil Tester Moisture

Time of Day to Use

Tomato fertilizer is best used in the afternoon or evening when the plant roots have time to absorb nutrients. 

This is also a good time for watering since you don’t want to overwater your plants and cause them to rot.

How to Apply

The best way to use tomato fertilizer is by spraying it directly onto the leaves of the plant where you want it to grow. 

You can also mix it with water and pour it onto the soil below where you want your plant to grow.

Special Note: If you are using tomato fertilizer as a liquid, mix it with water before applying it to your plants. If you are using granular tomato fertilizer, scatter it over the soil instead of trying to soak it into it with a watering can.

Things to Consider

When using tomato fertilizer for other plants, it’s important to consider how much your plants need. If you are using a balanced tomato fertilizer, then there should be enough nutrients in the formulation for all of your plants. If not, then you may need to add an additional amount of feed.

If you want to use synthetic tomato fertilizer as well as organic tomato soil amendments and compost, then it’s best to mix them together before applying them to your garden plot or vegetable garden area.

Types/brands of Tomato Fertilizer Used to Feed Plants

Vegetable fertilizer used on houseplants

There are many types of tomato fertilizer used to feed plants. These types of fertilizers are not the same and may have different formulas, but they still work well for feeding tomato plants.

Different fertilizers have different functions. Some are more effective than others in increasing the growth rate of your crops. 

For example, one brand may be more effective than another when it comes to increasing the amount of fruit produced by a specific plant species.

These are the main categories of tomato fertilizer:

Granular Tomato Fertilizer

It’s a granular type of fertilizer used to feed tomato plants. It’s made up of a mixture of potassium and phosphorous. 

These nutrients are essential for plants to grow and thrive. Tomato fertilizer can be purchased at most garden centers or farm stores.

Liquid Tomato Fertilizer

This type of fertilizer comes in liquid form so that you can apply it directly to your plants without having to water them first or apply it through drip irrigation lines. You don’t need to worry about applying too much because it is concentrated so only what your plants need will reach them through their roots.

Tomato Fertilizer Brand

The most common brand is Miracle-Gro, but many other brands are also being used.

The Miracle-Gro Company has been in business for over 50 years, and they have developed multiple different products for consumers to use.

I have had the best results from using Miracle-Gro Soluble fertilizer. It’s great value for money and will last a long time. You can find it by clicking here.

Miracle-Gro 1001233 Water Soluble

They also have a website where people can buy their products online if they would like to do so.

One of the most popular Miracle-Gro products is the Tomato Starter Kit. This kit comes with everything you will need to start feeding your plants with tomatoes.

It includes a seed packet, potting soil, and fertilizer bags for each plant type that you want to grow. 

You can also order additional bags of fertilizer if you want more than one bag per plant type.

Is Tomato Feed Harmful to Houseplants?

Yes! Tomato fertilizers are harmful to some houseplants for example orchids. Orchids do not need heavy fertilizer so, before applying tomato fertilizers to them you should dilute them. This has to be done because tomato fertilizers are heavy feeders which are not suitable for the health of orchids. 

Plants That Can Grow Sufficiently with Tomato Fertilizer:

Tomato feed can be applied to almost all plants, including ornamentals, fruits, and vegetables. This organic tomato feed is made up of high nitrogen, phosphorus, and potassium levels, which are essential nutrients needed for optimum plant development.

There are some specific plants that grow well with tomato fertilizers. We will discuss those plants here:


To fertilize your cucumbers, you use either complete fertilizer or special cucumber fertilizer. In addition to this particular product, you can also use tomato fertilizer or vegetable fertilizer. They all bring the necessary nutrients for your cucumbers and have an exceptionally high potassium content.

Note: When using, pay attention to the manufacturer’s instructions on the packaging. This is the only way you can fertilize your cucumbers properly and avoid over-fertilization.


The peppers can also be fertilized by tomato feed because tomatoes and peppers have almost the same nutritional requirements. Therefore, you don’t need to worry if you add tomato fertilizer to your pepper plants. 


You can also use tomato feed on herbs because tomato feeds are high in potassium which is good for the growth of herbs. The best time to feed herbs with tomato feed is in mid-summer because at that time, it helps them toughen up.

Olive Tree

As the tomato feeds are fast-release fertilizers, they are best to feed the Olive trees. To get the best growth for your Olive trees, combine the fast-release tomato fertilizers with slow-release fertilizers.


If you want your onion bulbs to grow healthy and have healthy tissues, then the tomato feed is most suitable for them because of its high potash content.


When strawberry plants are established, they need less fertilizer. During the late summer, balanced fertilizer such as 10-10-10 works well. 

After your harvest, apply 2 to 3 pounds of this nutrient per 100 square feet to encourage growth for next year’s harvest. Keep fertilizer off foliage and water thoroughly so that nutrients reach roots. 

If you’re using tomato fertilizer with three equal numbers (20-20-20), use half the rate of a 10-10-10 on established strawberries at this time. 

Adjust application as needed. For example, one 20-20-20 has double the percentage of nutrients; use only half as much at one application per season on established plants.


To encourage potato plants to grow tubers, feed them with tomato feed every two weeks from May to September. If you use general-purpose feed, the foliage will grow too much; however, if you use tomato feed, your potatoes will develop tubers.

NutrientUse Deficiency Symptom
Nitrogen – NA major component of chlorophyll and is used in photosynthesisStunted Growth, Pale color, Light green yellowish leaves
Prosperous – PEnergy transfer, photosynthesis, the transformation of sugars and starchesStunted growth, darkening of the leaves
Potassium – KEnzyme activation in plants, Increases root growth and improves drought resistance. Brown scorching and curling of leaf tips
Calcium – CaTo provide structural support to cell wallsPlant dark green, Drying starts from the tips, Tender leaves pale
Magnesium – MgUsed in chlorophyll production and enzyme regulationPaleness from leaf edges. Edges have cup shapes folds
Sulfur – SUsed in the formation of amino acids, proteins, and oilsLeaves light green, veins pale green
Boron – BUsed for cell wall formation and plant stabilitydiscoloration of leaf buds. breaking and dropping of buds
Copper – CuPhotosynthetic and respiratory electron transport chainsPale pink between the veins. wilt and Drop.
Chlorine – ClOsmotic and stomatal regulation, disease resistance and toleranceWilting of leaves, especially at the margins
Iron – FeUsed for the synthesis of chlorophyll, and it is essential for chloroplast functionLeaves are pale, No spots, major veins Green
Manganese – MnSustains metabolic roles within different plant cell compartmentsLeaves pale in color, veins dark green
Zinc – ZnFormation of chlorophyll and some carbohydratesLeaves pale, dark spots on leaf edges
* These are the more predominant nutrients found in fertilizers and can vary by brand.

The Takeaway

In a nutshell, tomato fertilizer contains all the main nutrients required by the plant. These include nitrogen, phosphorus, and potassium which are all essential for the healthy growth of the plant. 

There are many types of tomato fertilizers available in the market, and each one has its advantages, so you should choose the one that suits your needs and requirements best. 

You can use organic or chemical-based tomato fertilizer for any of your plants, but make sure you use the right amount and apply them regularly.

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