What Size Grow Bag For Tomatoes

What Size Grow Bag For Tomatoes? A Comprehensive Guide

You can grow your tomato plants in grow bags if you have limited garden space. However, what size grow bag for tomatoes is sufficient?

A tomato plant should have a grow bag with a diameter of at least 15 inches (38 cm) and a depth of at least 12 inches (30cm) for healthy growth, which means you should get a 10 gallon grow bag or larger. You must choose the right tomato plant when you want to grow tomatoes.

There is a lot more you ought to know before growing tomatoes in bags, including tips, the perfect bags and benefits of growing your tomatoes in bags. To know more about what size grow bag for tomatoes, continue reading this article. 

What Size Grow Bag For Tomatoes is The Best?

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Container, pot, and grow bag growing of tomatoes is common. Those without a yard or garden can use a container as an alternative. You can grow tomatoes in a container fairly easily. To plant a tomato plant, you must first determine what size container or grow bag you need.

This choice is directly related to the tomato variety you select. You should pay attention to certain factors during this process.

Growing tomatoes in a grow bag will depend on the variety and category of tomato you plan on planting. You can use 5 – 7 gallon grow bags for compact patio tomatoes (such as Tiny Tim dwarf cherry tomatoes, Elfin tear-shaped tomatoes, Window Box Romas, or Patio F hybrids).

The best grow bags for determinate tomato plants are those that hold 10 gallons or more. The best bags for indeterminate tomatoes are those with a capacity of 20 gallons or more.

Tomato plantations should use grow bags with a diameter of 8 inches(15-17 cm) or 14 inches(30 cm or larger). Tomato plants require a grow bag or pot at least 10-15 inches in diameter, and a minimum depth of 8-12 inches is required.

Growing Tomatoes In Small Grow Bags Is Not A Good Idea

It would be a mistake to purchase a smaller size grow bag planter. Although tomatoes can technically be grown in a 5-gallon bag, it is not recommended. If a grow bag is too small, tomato roots will be constrained, which will reduce water and nutrient uptake, leading to a smaller tomato yield and inferior taste.

Additionally, a smaller grow bag will be easily blown over by strong winds. If you want to plant tomatoes, you should use larger pots to hold more root mass. The plants will not develop properly and store enough water to get through the day without this mass.

A Grow Bag’s Benefits

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When tomatoes are grown in grow bags, their root systems become robust since they are “air pruned.” Can you explain what this means? Plant roots stop growing when they contact dryer soil, and more air on the sides of the grow bag.

As a result, the plant grows new roots, resulting in a root system built of branches that easily absorb nutrients and water. Unfortunately, growing tomatoes in a conventional pot will cause the roots to circle the sides, potentially strangling them.

How Long Does It Take For Grow Bags To Leach Chemicals?

Growing bags are frequently asked about their safety: are they toxic? Such concerns are valid. Using these pots requires the gardener to determine if the materials used to make them absorb any hazardous chemicals that can harm plants. Polypropylene plastic (PP), similar in feel to felt, is typically used in growing bags. 

Polypropylene is one of the most common plastics used to store food. The container is #5 (if you don’t know, food-safe plastics are #1, #2, #4, and #5). The same principles apply when growing food, particularly plants that will be picked above ground (such as tomatoes, berries, and leafy greens).

How To Grow Tomatoes In Grow Bags, Pots, And Other Containers

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  • Place your grow bags in a bright, sunny, and well-ventilated area. It is recommended that you provide your tomato plants with at least 8 hours of natural light during the summer. 
  • To ensure faster, stronger, and healthier tomato plants, plant your tomato plants deeply so they can absorb nutrients more effectively. (Unlike other plants, tomatoes can grow roots along the buried stem, so do not worry about planting them deeply).
  • Due to the porous nature of grow bags and their ability to drain quickly, they require more frequent hydration. You should water them at least twice a day during hot weather and when your plants have reached maturity. Not enough time? Then consider installing drip irrigation.

Tips for Maintaining Tomato Plants in a Grow Bag

After growing your tomato plants, it is important to provide them with the necessary requirements. This will allow them to produce optimal yields and grow well. Here are some tips to maintain your plant:

1. Water Regularly

While in grow bags, tomatoes require continuous watering. Always ensure the soil is moist, and water it when its surface feels dry. Preferably, create a watering schedule for the tomato plants, especially in the summer months. But be careful while adding water to the soil to prevent overwatering it.

2. Apply the Right Fertilizers

Provide the right amount of fertilizers for the tomatoes throughout the growing season. Keep in mind that tomatoes need lots of nutrients to survive, and the grow bags’ soil capacity is limited. Consider applying organic compost to the soil or a rich, slow-release, liquid fertilizer.

3. Expose to Sunlight

Place the tomato plants in spots where they can receive at least 6–8 hours of direct sunlight every day. Fortunately, the grow bags are movable, making it easier to choose the right spot for your tomato plants to get enough light.

4. Inspect the Tomatoes for Pests

Watch out for signs of pests on your tomatoes before it’s too late. Common pests that attack these plants include whiteflies, aphids, and tomato hornworms. Apply neem oil or other pesticides to the tomatoes to get rid of these insects if you notice signs of infestation.

Learn more on tomatoes: Can You Plant Tomatoes in a Kiddie Pool?


There is no reason why you couldn’t grow tomatoes at home if you didn’t have a lawn or a garden. The grow bags take up a little space on an indoor or outdoor shelf, and then you’re ready to start growing. Depending on their size, you can choose what size grow bag you need for your tomatoes.

How big grow bags for tomatoes should I use? Grow bags hold 10 gallons for determinate tomatoes and 20 gallons for indeterminate tomatoes. You will need 5-7 gallon grow bags to grow smaller tomato varieties such as cherry tomatoes.

Grow bags for tomato plants should have at least a diameter of 15 inches (38 cm) and a depth of 12 inches (30 cm).

Frequently Asked Questions

Does tomato grow bags have enough depth?

The plant’s stems will sprout roots and allow the plant to grow more vigorously if planted deeper in the soil than other plants. Sow seeds directly into the bag when it is 34% full.

Can tomatoes be grown in a 3 gallon grow bag?

A tomato plant’s type determines the size of its pot. Deciduous plants grow best in pots of four to five gallons, though they can be adequately grown in a three-gallon pot. The dwarf tomato varieties, sometimes called patio tomatoes, thrive in pots of 3 gallons and can even be grown in pots as small as 1 or 2 gallons.

Are pots or grow bags better for growing tomatoes?

Even though you can grow three tomato plants in a 20cm pot or grow bag, they will grow better, happier, and more productively if they have more space to spread. Consider giving a single plant a 30cm pot, and you will see a significant difference.

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