Tomato Week

How to Fertilize Tomato Plants as a Beginner Gardener

Harvest time will be here before you know it, and if you want to enjoy the fruits of your lobar, now is the time to start thinking about fertilising your tomato plants. With just a little bit of care and attention, you can ensure that your plants are healthy and produce a bountiful harvest. Here’s what you need to know about fertilising your tomato plants for the best results.

Why fertilise tomato plants?

Tomato plants are heavy feeders, which means they require a lot of nutrients to produce healthy fruit. Tomato plants need three main nutrients: nitrogen, phosphorus, and potassium. Nitrogen helps with leaf growth, phosphorus promotes root growth, and potassium helps the plant withstand stress and disease.

Fertilising your tomato plants will ensure that they have all the nutrients they need to produce healthy fruit. It’s important to fertilise your plants at the right time and in the right amount; otherwise, you run the risk of over-fertilising, which can actually damage your plants.

What are heavy feeders?

In the world of gardening, “heavy feeders” refer to plants that require large amounts of nutrients in order to thrive. These types of plants tend to be fast-growing with high outputs, such as tomatoes, squash, and corn.

Others that fall into this category include leafy greens like lettuce and cabbage and flowers like roses and petunias. On the flip side, there are also “light feeders,” or plants that do not require as much nutrient input in order to flourish. Examples include herbs like mint and thyme and perennials like lavender and succulents.

When designing a garden layout, it is important to consider the needs of different plants – balancing heavy feeders with light feeders will ensure optimal growth for all varieties.


When to fertilise tomato plants?

The best time to fertilise your tomato plants is when they are actively growing and producing fruit. This typically occurs from late spring through early fall. You should fertilise your plants every two weeks during this time period.

Ways to fertilise tomatoes

1. Use compost or manure

Compost or manure is one of the best ways to fertilise your tomato plants. Both of these options are rich in nutrients that will help your plants grow. While store-bought chemical options are readily available, using all-natural compost or manure can provide essential nutrients for your plants while also being better for the environment.

To utilise these natural fertilisers, start by spreading a layer around the base of your tomato plants, making sure to avoid direct contact with the stems. As your plants grow and you continue to water them, the nutrient-rich compost or manure will seep into the soil and be absorbed by the roots. When it’s time to harvest your tomatoes, you’ll be rewarded with good flavour and lots of fruits.

You can either buy compost or manure from a gardening store, or you can make your own. If you choose to make your own, be sure to do it at least six weeks before you plan to plant your tomatoes, so it has time to break down properly.

2. Use a slow-release fertiliser (usually granular)

When it comes to fertilising tomatoes, a slow-release granular fertiliser is a terrific option. This type of fertiliser contains a mix of nitrogen, phosphorus, and potassium, which are all essential nutrients for plant growth. Unlike liquid fertilisers that need to be applied regularly, a granular fertiliser slowly releases nutrients over time, providing sustained nourishment for your tomato plants.

It also helps eliminate the risk of over-fertilising and burning plants. And because it’s in granular form, it’s easy to evenly distribute the fertiliser around each plant rather than just in one spot.

When using a granular fertiliser, simply scatter it around the base of your tomato plants according to package instructions and lightly mix it into the soil. Then sit back and watch your tomatoes thrive thanks to their steady supply of nutrients! Some gardeners like to use slow-release fertilisers in their tomato planting holes to prepare for the season ahead.

You can find balanced fertilisers at most gardening stores or online. Be sure to follow the instructions on the package carefully, so you don’t over-fertilise your plants.

3. Use a liquid fertiliser

If you’re looking to take your tomato garden to the next level, consider using a liquid fertiliser. Unlike traditional granular fertilisers, plants immediately absorb liquid fertilisers, providing quick and efficient nutrient uptake.

Plus, their liquid form means they can easily be applied directly to the soil or even sprayed directly onto leaves for maximum coverage. And because they’re not as prone to over-application as granular fertilisers, they’re less likely to harm your plants in the process.

Your tomato plants thank you with bountiful harvests, and you’ll also save time and effort when it comes to fertilising. That sounds like a win to me!

4. Prepare your tomato planting holes

All of the fertilisation methods above work perfectly well throughout the season, but you’ll want to do a little more for your tomatoes if you can. Since tomatoes are heavy feeders and most gardeners are looking to maximise their harvests, doing some tomato planting hole prep is common.

Before you go digging holes haphazardly in your garden, there are a few steps you can take to ensure optimal growth for your tomato plants:

  • Choose a location that receives plenty of sunlight throughout the day. (6-8 hours of full sun in most zones);
  • Next, dig a hole and loosen up the soil in the hole with a garden trowel or shovel;
  • Mix in some fertiliser, soil amendments, and compost to give the plants extra nutrients for healthy growth;
  • Place the plant in the ground. Bury the stem deep and trim off all but the top few leaves.

Once all these steps have been completed, water thoroughly and watch as your tomato plants thrive! I have a whole article on how to prepare tomato planting holes if you’re interested in learning more tips on how to do this correctly.

What is the best way to fertilise tomato plants?

There is no definitive answer to this question. Some gardeners prefer to use a granular fertiliser, while others find that liquid fertilisers work best for their plants. Ultimately, it’s up to you to experiment and see what type of fertiliser works best for your particular tomato plants.

Do keep in mind, however, that over-fertilising can harm your plants. Follow the instructions on whatever fertiliser you choose, and don’t go overboard in your application. A little bit of fertiliser can go a long way!

Most tomato gardeners will prepare their tomato planting hole at the beginning of the season and add some slow-release granular fertiliser into the mix. Then, they will use liquid fertiliser throughout the season to keep the tomatoes happy and healthy. If you’re looking for a suggested method of fertilising your tomato plants, that is what I’d recommend starting with.



FAQ on fertilising tomato plants

What are the best nutrients for tomato plants?

The three main nutrients that are essential for tomato plant growth are nitrogen, phosphorus, and potassium.

How often should I fertilise my tomato plants?

You should fertilise your tomato plants every two weeks when they are actively growing and producing fruit. This typically occurs from late spring through early fall.

Can I use manure to fertilise my tomato plants?

Yes, manure is an excellent natural fertiliser for tomatoes. It is rich in nutrients that will help your plants grow. Just be sure it’s well-rotted or composted, avoid direct contact with the stems, and mix it into the soil well.

What is the best way to apply fertiliser to my tomato plants?

The best way to apply fertiliser to your tomato plants is to use a slow-release granular fertiliser. This type of fertiliser will provide a steady supply of nutrients over time and is less likely to burn your plants. Scatter it around the base of each plant and lightly mix it into the soil.

Can I use too much fertiliser on my tomato plants?

Yes, if you use too much fertiliser, it can burn your plants. Following the package instructions carefully is important, so you don’t over-fertilise.

Wrapping up: How to Fertilise Tomato Plants

There are a few different ways that you can fertilise your tomato plants. One option is to use a granular fertiliser that you can mix into the soil around the base of the plant.

Another option is to use a water-soluble fertiliser that you can mix with water and apply directly to the leaves of the plant. Whichever method you choose, follow the fertiliser package instructions carefully so that you don’t damage your plants.

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