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What Size Grow Bag for Tomatoes? (Quick Answers)

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When you’re new to growing tomatoes, it can be challenging to determine the correct size grow bag for your plants because there are many factors to consider, including the size of the tomato plants you have, the climate where you live, and how much sunlight, your plants will receive.

For your convenience, we have put together a guide on choosing the right tomato grow bag.

Grow bag size for tomatoes

Grow bags for tomatoes should be 15 to 20 gallons. The depth and width should be at least 10 inches and 15 inches. Roma tomatoes and cherry tomatoes require a grow bag that holds six to eight gallons. For determinate tomatoes, a grow bag needs 10 gallons, and for indeterminate tomatoes, 20 gallons.

Specifically designed to house plants, tomato grow bags are containers for growing tomatoes. A grow bag offers many benefits, but the most important is that it provides much better control over watering and airflow than traditional pots and planters.

With this increased precision, growers can better manage their crops and avoid problems such as leaf scorch, water logging, and nutrient deficiencies. The following are some types of tomatoes and their grow bag sizes.

Indeterminate tomatoes:

Choosing a grow bag at least two to three times the height of your indeterminate tomato plants would be best.

It is recommended to have a grow bag of at least 20 gallons for indeterminate tomatoes. The depth or diameter should be 10 inches or 15 inches, respectively.

Determinate tomatoes:

Choose a grow bag three to four times the tomatoes’ height if you want determinate tomatoes. Also, it should have a depth of 12 inches or a diameter of 15 inches. Finally, there should be a capacity of at least 10 gallons in it.

Cherry tomatoes:

A grow bag of six to eight inches is adequate for cherry tomatoes. Additionally, the surface area of the grow bag should be large enough to allow sufficient air circulation.

Cherry tomatoes can be grown in bags measuring 10 by 12 inches. It is recommended to have a 6–8-gallon bag for Cherry tomatoes.

Roma tomatoes:

It is best to use a grow bag that measures 10 by 12 inches in height and 8 inches wide for Roma tomatoes.

A six to eight-gallon bag is sufficient for a single plant. However, if you have multiple plants, you should get a giant grow bag, such as one that measures 18 by 24 inches.

Beefsteak tomatoes:

For Beefsteak tomatoes, you will need a grow bag that measures at least 16 inches high and 12 inches wide. It is recommended to have a 15-gallon bag. You can, however, use a larger size like a 20 gallon grow bag if you have large plants.

Is a 5 gallon grow bag good for tomatoes?

Ideally, a grow bag should have a diameter of 15 inches and a depth of at least 10 inches. The 5 gallon grow bag would be suitable for tomatoes such as Roma and Cherry tomatoes.

However, for larger tomatoes like Indeterminate, Beefsteak, and Determinate, it is recommended that you get a more giant grow bag.

The 5 gallon grow bag is ideal for small tomato plants and plants that don’t require a lot of space. The same applies to tomatoes planted in the ground or containers on a patio.

A giant grow bag is better if you have more than one tomato plant, want to expand your growing area, or want to save floor space during the gardening season. You can use a 5 gallon grow bag if you have a small garden or limited space.

5 factors that determine grow bag size for tomatoes

Tomatoes are versatile fruit you can use in various dishes, so picking the right grow bag is crucial. Here are five factors that determine an increased bag size for tips on choosing the right tomato grow bag size.

Plant size:

The first thing you need to consider is the size of the plant. If you are growing smaller plants, a 5 gallon grow bag will do the trick.

Larger grow bags are best for transplants or plants grown in pots before planting in the ground. A larger bag can relax the roots and provide more space for them to grow.

Pot type:

The type of pot in which your tomatoes are growing will also affect the size of your grow bag. There are two kinds of tomato grow bags: soil-based and hydroponic-based.

The root system of soil-grown tomatoes requires a giant bag to accommodate it and prevent pests from damaging it. The plants are fed with nutrients directly through the water in hydroponic media, so the bag needs to be smaller.


You will also need a grow bag that is large enough for your tomatoes based on your location. Growing plants in a more giant grow bag may be necessary during those cold winter months while they’re dormant (a 5-gallon grow bag can hold a 3- to 4-foot plant).

A smaller grow bag may be more practical if you live in an area with mild winters.

Type of tomato:

The type of tomato you are growing also influences the size of the grow bag. Due to their shallow roots, dwarf tomatoes (such as beefsteaks and pear tomatoes) require less space than regular tomatoes.

To accommodate their sprawling roots, soil-grown cherry tomatoes require at least twice the amount of soil needed to grow a traditional tomato.

Using a grow bag:

Once you have determined the type and size of grow bag you need, you can begin. Your plants will thrive in a Grow Bag because it will provide them with all the nutrients they need to succeed and prevent pests from harming them.

Growing tomatoes in a Grow Bag doesn’t mean you can only harvest a certain number of tomatoes. If your plant is large enough for your container, you can gather as many tomatoes as possible.

Tips for determining to grow bag size and growing tomatoes in them

Growing tomatoes in a grow bag requires a few considerations. Your first step will be to decide the size of your tomatoes.

Secondly, make sure the grow bag size is large enough to accommodate the size of your tomatoes. You can grow tomatoes in grow bags by following these tips.

Decide on the size of grow bag you need:

Most grow bags range in size from 1 gallon to 5 gallons, but there is no specific limit as long as your plant fits inside.

For example, growing smaller plants (under 3 feet) in a 1-gallon or 2-gallon grow bag should be sufficient; taller plants (>3 feet) may require a 5-gallon or larger container.

Determine climate zone:

In cold climates, you might need a big grow bag for your tomatoes to keep them warm. However, a smaller grow bag may be best if you live in an area that experiences hot summers to protect your plants from excessive heat.

Check the size of the container you are using:

In a regular pot or garden bed, you do not need to determine the size of the grow bag. Nevertheless, if you are growing tomatoes in a large container (such as an outdoor barrel).

You may want to get a more giant grow bag to avoid crowding your plants and limiting their growth potential.

Get a grow bag made for tomatoes:

In most cases, grow bags are specifically designed for growing tomatoes, so make sure you choose one that is appropriate for your climate and the size of the container when buying one.

Growing tomatoes in a generic grow bag is possible if you cannot find a grow bag made explicitly for tomatoes.

Fill the grow bag with soil:

To grow, you must fill the bag with fresh, top-quality soil of the highest quality. Add some organic matter (such as compost) to your ground when planting your plants to enable them to grow and thrive.

Place the grow bag in a location with good light:

For tomatoes to develop and produce fruit, they need direct sunlight to grow, so place your grow bag in an area that receives a lot of natural sunlight (for example, near a window) to receive direct sunlight.

There may be a need for supplemental lighting if you are unable to position the container in such a way as to ensure that it gets adequate sun exposure.

Final Thoughts

It is recommended to have at least a 10-gallon grow bag for tomatoes. Standard grow bags should have a depth of 10 inches and a diameter of 15 inches. The largest size of grow bag is required for indeterminate tomatoes. Other tomato plants need grow bags smaller than 10 gallons.

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