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What Size Grow Bag For Tomatoes Should You Get? - The Bamboo Guy

What Size Grow Bag For Tomatoes Should You Get?

Limited garden space or the absence of a yard should not discourage you from growing your own tomatoes. Whether you have an indoor or outdoor space, using grow bags can provide an excellent solution for cultivating tomatoes. However, you must select the correct grow bag size to optimize tomato growth and yield.

In this blog, we will tell you what size grow bag for tomatoes you will need and the benefits associated with their use.

Factors To Consider When Selecting Grow Bag Sizes

Regarding healthy tomato plant growth, the size of the grow bag matters. There are certain factors you should consider when determining an ideal grow bag size for tomato plants. These factors are:

Tomato Variety: Different tomato varieties have varying growth patterns and sizes. Smaller tomato varieties, such as cherry tomatoes, require smaller grow bags, while larger varieties, such as beefsteak tomatoes, require additional space for growth.

Soil Quality: You must use quality soil in your grow bags for optimal plant nutrition. While potting soil is recommended, garden soil can also be used. However, if garden soil is chosen, a larger grow bag will be required to ensure sufficient soil quantity for optimal nutrient uptake.

Indoor or Outdoor Plantation: Growing tomatoes indoors or outdoors can affect their care and watering needs. The size of the grow bag should be adjusted accordingly to meet these requirements.

Portability and Location: Consider the need to move the tomato plants to cater to their sunlight exposure and other environmental factors. Moreover, consider the conditions during different seasons, such as excessive heat in summer or heavy rainfall, to select the appropriate grow bag size.

Determinate Vs Indeterminate Tomatoes

Before choosing the what size grow bag for tomatoes, it is essential to understand the differences between determinate and indeterminate tomato varieties:

Determinate Tomatoes: These varieties have a compact size with a bushy appearance. Determinate tomatoes produce their entire crop simultaneously, making them suitable for gardeners who prefer to harvest and process their tomatoes simultaneously. Examples of determinate tomato varieties include Roma, Celebrity, and Early Girl.

Indeterminate Tomatoes: Indeterminate tomatoes continue growing until the end of the season and can reach heights of over 12 feet. They require support, such as or cages, to prevent the vines from falling over. Those who love to enjoy fresh tomatoes every day must pick Indeterminate tomatoes. Because indeterminate Tomatoes produce fruit continuously throughout the season, providing a steady supply of fresh tomatoes. Popular indeterminate tomato varieties include Beefsteak, Better Boy, and Big Mama.

Best Grow Bag Sizes For Different Tomato Varieties

Based on the factors mentioned above and the characteristics of determinate and indeterminate tomatoes, the following grow bag sizes are recommended:

Determinate Tomatoes: Most determinate varieties thrive in 10-gallon or larger grow bags. It is advisable to choose grow bags with a diameter of at least 15 inches (38cm) and a height of over 12 inches (30cm) for healthy tomato growth. However, larger grow bags will provide more space for root development, regardless of the tomato variety.

Indeterminate Tomatoes: Indeterminate tomato plants require more room for their sprawling growth. A 20-gallon or larger grow bag is recommended, ensuring a minimum diameter of 20 inches and a depth of at least 15 inches. These larger grow bags accommodate the extensive root system of indeterminate tomatoes, promoting healthier growth and higher yields.

Compact Patio Tomato: The compact patio tomatoes are tiny in size and thus able to grow in a 5-7 gallon grow bag. The noticeable examples are Tiny Tim dwarf cherry tomato, Window Box Roma, and Elfin tear-shaped tomato.

Advantages Of Using Grow Bags For Tomatoes

Grow bags offer several advantages for growing tomatoes:

Breathability: Grow bags are made of breathable fabric, allowing for adequate soil aeration and dissipation of excessive heat. This promotes healthier root development and prevents root-bound plants.

Portability and Lightweight: Grow bags are lightweight and highly portable. On top, the presence of handles makes it easy to move the plants to different locations based on their sunlight and environmental needs.

Reusable and Easy to Store: Grow bags can be reused for multiple growing seasons, making them a sustainable choice. They can be easily folded and stored when unused, occupying minimal space.

Excellent Drainage: Unlike conventional pots, grow bags have excellent drainage capabilities. Excess water evaporates quickly through the fabric, preventing waterlogging and root rot.

Promotes Robust Root System: Growing tomatoes in grow bags encourages the development of a healthy and extensive root system. The breathable fabric allows roots to air prune, stimulating the growth of new roots and preventing root-bound plants.

Tips For Growing Tomatoes In Grow Bags

To ensure successful tomato cultivation in grow bag, consider the following tips:

Sunlight Exposure: Tomatoes require at least 8 hours of sunlight daily for optimal growth and fruit production. Place the grow bags in a sunny, bright, and well-ventilated location.

Planting Depth: Plant tomatoes deep in the grow bags to encourage the development of additional roots along the buried stem. This promotes stronger and healthier plants.

Watering: Grow bags have excellent drainage, which can result in quicker drying of the soil. Monitor the moisture levels and water your tomato plants frequently to compensate for the faster evaporation.

Soil Nutrients: Use high-quality potting soil or amend garden soil with compost before planting tomatoes in grow bags. Consider adding crushed eggshells to boost calcium levels and provide essential nutrients.

Planting Different Varieties: To ensure a steady supply of tomatoes throughout the season, plant different tomato varieties with varying yielding times. This will provide a continuous harvest.

Holding Up Your Tomato Plants:


What size grow bag for indeterminate tomatoes?

The ideal size of grow bag for indeterminate tomato varieties is 20 gallons (20 inches in diameter, 15 inches or more in height).

How many tomato plants per grow bag?

There's a space for 3 tomato plants per grow bag.

Can I use 5-gallon grow bags to grow tomatoes?

It is possible to grow tomatoes in 5-gallon grow bags. However, growing tomatoes in 5-gallon grow bags is not recommended. The limited space restricts root development, resulting in smaller yields and inferior taste.

Are grow bags suitable for you I saw that felt that I meaner vegetables?

Yes, Growing bags can be used for most vegetables, including peppers, eggplants, cucumbers, herbs Ensure you choose the appropriate grow bag size for each plant's needs.

Can I reuse grow bags for tomatoes?

Yes, grow bags can be reused for multiple growing seasons. Proper cleaning and storage after each season will ensure their longevity.


Growing tomatoes in a bag is an excellent solution for those with limited garden space or no access to a yard. By selecting the right size grow bag (15 inches in diameter and 10 inches in height), you can promote healthy growth and maximize your harvest for your tomato variety. Consider the factors mentioned, such as tomato variety, soil quality, and location, when choosing the appropriate grow bag size. With breathability, portability, staking and excellent drainage advantages, grow bags are a practical and sustainable choice for cultivating tomatoes. Follow the provided tips to enjoy a bountiful harvest of delicious homegrown tomatoes.

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