Fresh tomato salad from the garden with basil and feta

What Size Grow Bags For Tomatoes? [Our Verdict 2023]

Are you wondering what size grow bags for tomatoes are best? Look no further! 

As a tomato growing enthusiast (our family loves to eat them!), I can tell you that the size of your grow bag can make a huge difference in the success of your tomato plants. 

Choosing the right size can help ensure that your plants have enough room to grow and thrive, while also making it easier for you to care for them.

When it comes to grow bags for tomatoes, there are a few things to consider. 

First, think about the size of the tomato plant you want to grow. If you’re planting a smaller variety, like cherry tomatoes, you may be able to get away with a smaller bag. However, if you’re growing larger varieties, like beefsteak tomatoes, you’ll want to opt for a larger bag to accommodate their size.

This will give them enough space to grow and develop a healthy root system, while also making it easy for you to move them around as needed. We will take a deep dive into growing tomato plants in grow bags in this article… 

So let’s get into it!

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A typical summers day harvest with assorted tomatoes including cherry tomatoes and beefsteak tomatoes
A typical summers day harvest with assorted tomatoes including cherry tomatoes and beefsteak tomatoes

What Size Grow Bags for Tomatoes? In Short

The right size grow bag for tomatoes is essential for ensuring healthy plants and an impressive harvest. Grow bags offer a convenient and flexible solution for gardeners, especially in urban settings or where space is limited. I mean, you can even use them on a balcony or patio!

Grow bags enable efficient water and nutrient management, leading to strong root systems and, ultimately, a better chance of success. 

When starting out, I found that a general recommendation for tomato grow bags is to select a size with a capacity of at 5 gallons for most smaller varieties (just under 20 litres) and least 10-15 gallons (just shy of 60L). This gives your tomato plants enough space to develop an extensive root system and supports adequate water retention essential for healthy growth of your tomato plants.

However, it’s important to note that the size may vary depending on the specific tomato variety and your growing conditions. 

Grow bags with a 10-gallon capacity can be an excellent starting point, but it’s wise to adapt based on the variety of tomatoes being cultivated as tomato plants vary quite significantly.

Understanding Grow Bags

Grow bags have become a popular choice for growing tomatoes due to their numerous benefits. As a gardener, it’s essential to understand what grow bags are, their advantages, and the appropriate size to use for your tomato plants.

Grow bags are fabric containers, usually made from breathable, lightweight materials such as felt or nonwoven fabric, which allow for better root aeration and drainage. They come in various sizes, making them a versatile option for growing different types of plants, including tomatoes. Here are some key features of fabric grow bags:

  • Lightweight and convenient: Grow bags are relatively light, making it easy for me to move them around as needed. This feature is beneficial for optimizing sunlight exposure or rearranging plants within a small gardening space.
  • Handles: The handles on grow bags make it simpler for me to carry and reposition them without causing damage to the plants or the bags.
  • Versatile: Since grow bags are available in multiple sizes, I can choose the most suitable size for my tomatoes, depending on their growth habit and size.
  • Drainage: The porous fabric material promotes adequate drainage, preventing overwatering and root rot issues that can be common in traditional pots.

In addition to these benefits, it is crucial to select the right size grow bag for tomatoes. The appropriate size depends on the type of tomato plant and its growth habits. Here’s a quick guide to help you choose the best size grow bag for your tomatoes

Tomato TypeGrowth HabitRecommended Grow Bag Size
Cherry TomatoesDeterminate5 to 10 gallons
Patio TomatoesDeterminate10 to 15 gallons
Beefsteak TomatoesIndeterminate15 to 30 gallons
Heirloom TomatoesIndeterminate15 to 30 gallons

Different types of tomatoes have different requirements for space and root development, so it’s essential to pick the ideal grow bag size accordingly. By understanding grow bags and their benefits, I can make a well-informed decision for my tomato plants, ensuring they thrive and produce a bountiful harvest.

What size grow bag for tomatoes? This shows how the right size bag means a successful harvest. 
Tomatoes at varying stages of ripeness freshly harvested and ready to cook with including beefsteak tomatoes and cherry tomatoes.
Home grown tomatoes ready to cook with!

Why Use Grow Bags for Tomatoes

Growing tomatoes in grow bags has numerous benefits for both the plant and the gardener. 

One of the main reasons to use grow bags is the improved root system. The porous nature of the grow bag material allows for better aeration and drainage. This leads to superior root growth and prevents issues such as root rot. 

Another benefit of using grow bags for tomatoes is the reduced disease pressure. The soilless growing medium decreases the chance of soil-borne diseases and pests. 

Additionally, grow bags can be sterilized and reused, helping to maintain a clean and healthy growing environment.

Grow bags also offer flexibility in terms of size and location. There are various sizes of grow bags available, allowing you to choose the most suitable size for your tomato plants. 

Another benefit is that grow bags can be easily moved, making it simple to rearrange your garden or move plants to a more favorable location.

Grow bags offer several advantages when it comes to growing tomatoes. They promote a healthy root system, reduce disease pressure, and provide flexibility in terms of size and location. 

What size grow bags for tomatoes?
Tomatoes growing in fabric grow bags – looking healthy!

Grow Bag Sizes: A Comparison

When it comes to growing tomatoes, selecting the appropriate size grow bag is crucial for healthy plant growth and a bountiful harvest. Various factors should be considered, such as the type of tomato, space availability, and the desired yield. Here, we’ll examine the different sizes of grow bags, their advantages, and best uses.

Small Grow Bags

Small grow bags typically range from 1 to 3 gallons in size and are generally suitable for growing dwarf or patio tomato varieties. While these containers offer the following benefits, there are also limitations:

  • Suitable for limited space like balconies or small patios.
  • Lightweight and easy to move.
  • Less soil required, making it cost-effective.
  • However, not the best choice for larger tomato varieties as it might restrict root growth.

5 Gallon Grow Bag

A 5 gallon grow bag is a versatile option, as it can accommodate most tomato varieties, from cherry tomatoes to mid-sized slicing tomatoes. Here are some benefits to using a 5 gallon bag:

  • Allows space for proper root growth and development.
  • Can be used in various locations, such as greenhouses, patios, or raised beds.
  • Good choice for indeterminate tomato varieties like beefsteak tomatoes.

Larger Grow Bags: 10 and 20-Gallon Bags

For those growing more extensive or more productive tomato plants, larger grow bags are available in sizes such as 10 and 20-gallons. These offer ample space and several advantages:

  • Ideal for larger, indeterminate tomato varieties that require substantial root and vertical growth.
  • Can be used in outdoor gardens or spacious greenhouses.
  • Supports higher yields due to the volume of soil available.
  • With a larger size, there is the need for more soil which can drive up costs.
Grow Bag SizeBest forBenefitsLimitations
1-3 GallonsDwarf or patio tomato varietiesSuitable for small spaces, cost-savingNot ideal for larger tomato varieties
5 GallonsMost tomato varieties, especially indeterminateVersatile and increased yield potentialMay not be big enough for those looking for maximum yield
10-20 GallonsLarger indeterminate tomato varieties, high yieldsIdeal for spacious areas, supports heavy yieldsRequires more soil, making it expensive and challenging to move

In conclusion, it’s essential to choose the right size grow bag for tomatoes based on the plant variety, space availability, and desired yield. From small patio-sized bags to larger containers capable of supporting high yields, there is a grow bag option for every gardener’s needs.

Cherry tomatoes on the vine ripe and ready for harvesting
Cherry tomatoes ripe and ready for harvesting

Choosing the Right Grow Bag Size for Tomatoes

As a gardening enthusiast, I’ve experimented with various grow bag sizes for growing tomatoes. The size of the grow bag you choose depends on the type of tomato variety you plan to grow – determinate or indeterminate.

Determinate tomatoes, also known as bush tomatoes, have a predetermined growth size and usually don’t require a lot of space. For this variety, I recommend using a smaller grow bag, around 5 gallons. Some popular determinate varieties include:

  • Roma
  • Celebrity
  • Patio

Indeterminate tomatoes, on the other hand, continue to grow and produce fruit throughout the season. These varieties require more space and support for their constant growth. In my experience, a larger grow bag, preferably around 10 gallons, works best for indeterminate tomatoes. Some well-known indeterminate varieties are:

  • Cherry tomatoes
  • Sungold
  • Beefsteak

When it comes to grow bags, there are several factors to consider. Here are some of my recommendations based on my personal experience:

  • Size: Choose a grow bag that matches the tomato variety’s requirements. As mentioned earlier, sizes vary from 5 gallons up! 
  • Material: Fabric grow bags for tomatoes are an excellent choice due to their breathable nature, which allows for proper root aeration and prevents root circling.
  • Drainage: Make sure the grow bags have proper drainage holes to prevent waterlogging.
Tomatoes at varying stages of ripeness, still on the vine but some ready to be harvested
Tomatoes at varying stages of ripeness, still on the vine but some ready to be harvested

Optimal Soil Mix for Tomato Grow Bags

When it comes to selecting the right soil mix for tomato grow bags, I prefer a blend that provides excellent drainage, retains moisture, and offers sufficient nutrients. 

Below is a list of key components to include in an optimal soil mix for tomatoes.. You don’t need to follow this exactly, it’s just a guide for optimum growth.

  • Garden soil: A good base for the mix, which helps with water retention and provides essential minerals.
  • Potting soil: Lightweight and rich in organic matter, ideal for root growth.
  • Compost: Adds essential nutrients and improves soil structure.
  • Organic fertilizer: Provides additional nutrients for optimal growth.
  • Peat moss: Helps to retain moisture and improve soil structure.
  • Vermicompost: Aids in moisture retention.
  • Perlite: Improves drainage and airflow.

I recommend the following proportions for creating the ideal tomato soil mix:

ComponentProportion
Garden soil1 part
Potting soil1 part
Compost1 part
Peat moss1 part
Organic fertilizer1/4 part
Vermicompost1/4 part
Perlite1/4 part

It is important to remember that the type and size of the grow bag will also influence the amount of soil mix needed. Ensuring that the grow bag is filled adequately with the optimal soil mix will support healthy root development and promote a successful tomato crop.

Different varieties of tomatoes thriving in their large fabric grow bags
Different varieties of tomatoes thriving in their grow bags

Planting Tomatoes in Grow Bags

When selecting the appropriate size grow bag for tomato plants, it’s crucial to consider the factors such as media volume and watering frequency to ensure optimal growth. A 5-10 gallon grow bag for tomatoes will suit most varieties but read on for more specific suggestions.

First, prepare the grow bags for planting:

  1. Select the right size grow bag for your tomato plants. As mentioned earlier, a 5-10 gallon bag is usually a suitable choice.
  2. Fill the grow bags with a quality growing medium, like a mix of peat, coco coir, or perlite mixed with quality potting mix. Make sure the medium is evenly distributed and reaches the top of the bag.

Once the grow bags are prepared, it’s time to plant the seedlings:

  1. Dig a hole in the center of the grow bag, deep enough to accommodate the tomato seedling’s root ball.
  2. Gently remove the seedling from its current container or nursery tray, being careful not to damage the roots.
  3. Place the seedling into the hole, ensuring that it is set deep enough, with the lowest set of leaves just above the growing medium’s surface. If necessary, add or remove soil to adjust the depth.
  4. Secure the seedling by firming the soil around its base.

After planting, remember to provide adequate care for your tomato plants:

  • Water the seedlings regularly, ensuring the growing medium is always moist but never waterlogged.
  • Apply a balanced, slow-release fertilizer according to the product’s instructions.
  • Stake or cage the tomato plants, as they grow, to provide support and prevent breakage. 
  • Keep an eye out for pests and diseases, treating them promptly with the appropriate methods to ensure your plants grow healthy and strong.

By following these steps and selecting the appropriate size grow bag, you can expect successful tomato growth, water status, and yield.

My eldest daughter holding freshly harvested tomatoes including beef steak tomatoes and cherry tomatoes.
Tomatoes harvested by my daughter – the kids love them!

Maintaining Your Tomato Plants

When growing tomatoes in grow bags, it is important to make sure your plants are getting the love, care and exposure to the elements they need to thrive. 

  • Watering: Tomatoes require consistent watering to maintain healthy growth. To avoid over-watering or under-watering, it’s best to monitor the soil moisture regularly. When the top inch of soil feels dry to touch, it’s time to water. Make sure your grow bags have drainage holes to allow excess water to escape, preventing root rot.
  • Nutrients: When using grow bags, the limited amount of soil can make it challenging for tomato plants to get all the nutrients they need. To compensate for this, a balanced liquid fertilizer, rich in potassium, phosphorus, and nitrogen should be applied every two weeks. Make sure to follow the recommended dilution rates and application instructions on the fertilizer package.
  • Water and Nutrient Table: Here’s a simple table of key factors to maintain your tomato plants in grow bags:
FactorRecommendation
WateringWhen the top inch of soil feels dry
FertilizingEvery two weeks using a balanced liquid fertilizer
Drainage HoleEnsure grow bags have enough holes to allow excess water to drain

  • Sunlight: Tomato plants need at least 6-8 hours of direct sunlight daily to grow healthy and produce a good harvest. Place the grow bags in an area where they receive ample sunlight throughout the day.
  • Support: Tomatoes can become quite heavy and may require support to keep them from falling over. Adding stakes or cages to the grow bag can provide the necessary support and also make it easier to manage the plants as they grow.
  • Airflow: Adequate airflow around your tomato plants can help prevent diseases and pests. Make sure to space your grow bags apart and trim any unnecessary foliage to improve air circulation.

Harvesting and Storing Tomatoes

When it comes to harvesting tomatoes, there are a few things to keep in mind. Make sure to monitor the development of the fruits, as size, color, and firmness can all indicate when tomatoes are ready for harvest

Generally, tomatoes are harvested when they are fully colored and slightly firm to the touch. Of course, the optimal harvest time can vary based on factors like the specific variety and growing conditions.

Here are some key factors I consider during the growth process of tomatoes:

  • Tomato variety: Different varieties of tomatoes produce fruits and flowers at different rates.
  • Grow bag size: The size of the grow bag used for tomatoes can impact the overall yield of the plant. A larger grow bag will typically lead to more robust growth and an increased yield.
  • Plant maintenance: Regularly pruning and caring for tomato plants can help maximize yield by ensuring the plant’s energy goes toward fruit production rather than unnecessary foliage.

After harvest, proper storage is crucial to maintaining the quality of tomatoes. It’s a good idea to store tomatoes at room temperature and away from direct sunlight. 

This helps to prevent over-ripening which can degrade their nutritional value. Additionally, avoid stacking tomatoes on top of one another, as this can lead to bruising and spoilage.

During storage, it’s also essential to remain vigilant for any signs of spoilage. Some tips for detecting these include:

  1. Observe the appearance: Rotten tomatoes may have wrinkled skin, mold spots, or be leaking fluids.
  2. Check the odor: Spoiled tomatoes often have a sour or unpleasant smell.
  3. Gently feel the fruit: Soft or mushy tomatoes are likely overripe, while overly hard ones may not be ripe enough. You can however let them continue to ripen off the vine.

Harvesting and storing tomatoes carefully can ensure that the fruits remain fresh and retain their nutritional value throughout the process. It’s also a great way to keep enjoying your tomatoes after the season ends.

A large tomato harvest at the perfect stage of ripeness and ready to eat.
A bountiful harvest! We can never have too many tomatoes in this home.

Types of Tomatoes for Grow Bags

Generally, there are two main categories of tomatoes based on their growth habits: determinate and indeterminate. Let’s look into these varieties and which ones are the most suitable for grow bags.

Determinate Tomatoes

Determinate tomatoes, often referred to as bush tomatoes, grow to a predetermined size and produce fruit within a short period. These types of tomatoes are suitable for grow bags as they take up less space and require little support. Some popular determinate varieties that work well in grow bags include:

  • Roma: These tomatoes are great for sauces and paste due to their low water content.
  • Dwarf: Dwarf tomato varieties stay small and compact, making them perfect for limited spaces.

Indeterminate Tomatoes

Indeterminate tomatoes, also known as vining tomatoes, continuously grow and produce fruit throughout the season. While these varieties tend to need more space and support, many gardeners successfully grow them in larger grow bags with proper staking. Here are a few indeterminate varieties that can be grown in grow bags:

  • Cherry Tomatoes: These bite-sized tomatoes are a popular choice for container gardening. They grow fast and produce an abundance of fruit. My kids love eating these straight out of the garden! Yum!
  • Beefsteak: Although larger than cherry tomatoes, beefsteak varieties can still be grown in grow bags. They produce big, juicy fruits perfect for slicing.

Remember to consider the determinate or indeterminate growth habits, as well as the specific varieties such as cherry, roma, and beefsteak tomatoes, to ensure the best possible results.

Advantages and Limitations of Grow Bags

When it comes to growing tomatoes, many gardeners opt for grow bags as an alternative to traditional in-ground or raised bed gardening. Some advantages and limitations of utilizing grow bags for tomatoes are:

Advantages

  • Space-saving: Grow bags are perfect for limited space or small gardens. Yes, you can grow tomatoes on patios, balconies, or even indoors near a sunny window!
  • Affordability: Grow bags are relatively inexpensive compared to other garden containers. This makes grow bags a perfect option for beginner gardeners or those on a budget.
  • Portability: One of the most significant features of grow bags is their portability. I can easily move these bags around, allowing me to rearrange my garden layout depending on sunlight and other conditions.
  • Easier maintenance: Grow bags often provide better drainage than traditional pots or containers, which means tomatoes are less likely to develop root rot or other water-related problems. This saves time and effort in maintaining plants.

Limitations

  • Size limitations: Though grow bags come in various sizes, they may have limited capacity. Choosing the right size grow bag for tomatoes is pertinent to success.
    Disease risk: While the improved drainage in grow bags can prevent some diseases, the lightweight nature of these bags makes my tomatoes more susceptible to toppling over in strong winds or during severe storms.
  • Frequent watering: Due to the improved drainage, I may need to water my tomato plants more frequently to ensure they receive adequate moisture. Monitoring the plants and adjusting the watering schedule can prevent this issue.

Grow bags offer a viable alternative for growing tomatoes in limited spaces. It can also be a fantastic way to keep your garden very organized and easily accessible being that bit higher off the ground.

Best Grow Bags for Tomatoes

In my experience, selecting the right size grow bag for tomatoes is essential for their growth and development. Before diving into the details, let’s summarize the most important aspects to consider:

  • Ideal grow bag size for tomatoes
  • Key features of the best grow bags
  • Practical tips for using tomato grow bags

Tomatoes require ample space for their roots to grow and thrive. A minimum size of 5 gallons (just under 20 litres) should be used for optimum growth. 

However, there’s more than just size to think about when selecting the best grow bags for tomatoes. Let me break down the key features you should look for in a grow bag:

  1. Durable material: Look for grow bags made of long-lasting, non-woven fabric that promotes healthy root growth and can withstand frequent watering.
  2. Drainage: Good drainage is essential for preventing over-watering. The bag should have evenly distributed drainage holes at the bottom.
  3. Handles: Strong handles are a must for easy repositioning and transportation of your grow bags.

Once you have chosen the right size and quality of grow bags for your tomatoes, follow these practical tips to help you get started:

  • Fill the grow bag with a high-quality potting mix combined with worm castings. This will provide the essential nutrients and microorganisms for optimal growth. 
  • Place the grow bag in a sunny spot that receives at least 6-8 hours of direct sunlight daily.
  • Water the tomatoes consistently, keeping the soil moist without over-saturating it.
  • Provide a sturdy support structure, such as a cage or trellis, for the plant to grow upward and prevent bending or breakage.

Selecting the best grow bags for tomatoes involves considering the appropriate size, quality of the material, drainage, and practical usage tips. 

By addressing all of these factors and following the advice I’ve provided, you can confidently grow tomatoes in grow bags and get stuck into that juicy, nutritious fruit soon!

A fresh tomato salad – picked from the garden with fresh basil and feta – YUM!

Frequently Asked Questions

Which Grow Bag Size For Beefsteak Tomatoes?

For beefsteak tomatoes, I recommend using a larger grow bag size. A 10-gallon size is ideal because it allows for optimal root development and provides enough room for these larger tomato varieties. This will help improve fruit production and overall plant health.

What Size Grow Bag For Roma Tomatoes?

Roma tomatoes, being smaller than beefsteak tomatoes, can thrive in a slightly smaller grow bag size. A 5-gallon grow bag works best for growing Roma tomatoes, as it provides enough space for proper root development without being too large.

How Many Tomato Plants Can Fit In A 5-Gallon Grow Bag?

In a 5-gallon grow bag, it’s best to grow only one tomato plant. Tomato plants need ample space for their root systems to spread out and grow, which is essential for proper nutrient absorption and water uptake. 

By limiting the number of plants in a 5-gallon grow bag to just one, you can ensure that your tomato plant has enough room to grow and thrive.

What Size Grow Bag For Indeterminate Tomatoes?

Indeterminate tomatoes are known for their continuous growth and indeterminate fruit production. Due to this prolific growth habit, they require a larger grow bag. 

A 10-gallon grow bag is recommended for indeterminate tomatoes, as it allows for ample root development and provides sufficient room for these more substantial tomato plants.

Growing Potatoes In Grow Bags? Is It Possible?

Yes, grow bags are suitable for growing potatoes. In fact, many gardeners prefer using grow bags for potatoes because they make it easier to harvest the tubers without damaging the plant or digging up the entire root system. 

Have you also found ‘surprise potatoes a season or two after harvest? Using grow bags prevents these ‘escapee’ potatoes.

For growing potatoes, a 7-10 gallon grow bag is recommended.

Can You Provide A Grow Bag Size Chart For Various Vegetables?

Below is a table showing recommended grow bag sizes for different vegetables:

VegetableRecommended Grow Bag Size (gallons)
Tomatoes (Beefsteak)10
Tomatoes (Roma)5
Tomatoes (Indeterminate)10
Potatoes7-10
Peppers5
Eggplant5-7
Cucumbers7-10
Carrots3-5
Lettuce3
Spinach3

It’s important to consider the specific needs and growth habits of each plant when choosing the appropriate grow bag size. The sizes listed in the table above should serve as a general guideline for your vegetable garden planning.

So, there you have it folks!

Looking at what size grow bags for tomatoes? We hope you’ve found the answers you need here today. The number of tomato plants you can grow in a single grow bag depends on the size of the bag, the type of tomato plant, and the growing conditions. 

As a general rule, it’s best to plant only one tomato plant per grow bag to ensure that it has enough space for its roots to spread and for the plant to grow to its full potential. 

However, if you have a large enough grow bag and are growing smaller varieties of tomato plants, such as cherry tomatoes, you may be able to plant multiple plants in a single bag. 

It’s important to research the specific needs of your tomato plants and choose the appropriate size and number of grow bags accordingly.

Armed with all of that info you should have beautiful, juicy tomatoes to enjoy in no time!

So, let’s get digging!

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