Determinate Vs. Indeterminate Tomatoes: Key Differences

Determinate Vs. Indeterminate Tomatoes

To get to the short answer …

• Determinate plants are “bush” tomatoes and only grow until they reach a fixed size. (Think: a “determined” size.)  These plants are small and bushy and tend to produce all their fruit within a few weeks.
• Indeterminate plants are “vining” tomatoes and continue to grow with no fixed size. (Think: “indefinite”). They are huge vines sprawling 6 to 10 feet long or more and will keep producing tomatoes until frost hits and they die.
• Differences go beyond how they grow. They are different in terms of harvesting and cooking goals, as well as how they are supported/trellised, how they are pruned, and garden space needs.
• For beginners, determinate tomatoes are best. They only require staking, not a complex trellising system. We’ll get more into the differences below so you can choose the option that’s best for you and understand the reasons why.

All About Determinate Tomatoes

• The size of determinate plants has been predetermined by genetics. Most varieties will grow about 2 to 3 feet tall; some may get as large as 4 feet, but that is about tops for height.
• Most don’t require any kind of support, though they often do better if they are staked or caged.
• The plants tend to stop growing after forming fruit.
• They produce most of their fruit in one or two flushes over a short span of time, and then they are done for the season.

• Due to their compact size, they are excellent for small gardens or for growing in containers. 
• If the word “bush” is in a variety of names, chances are good that it is determinate.
• Their fruit is often the first to ripen in the garden.
• Many paste tomatoes, such as ‘Roma’ and some old favorite slicers, including ‘Rutgers,’ ‘Marglobe,’ and ‘Celebrity’ are determinates.

Growing Tips

• All tomatoes are sun lovers! Pick a location with 6 to 8 hours of direct sunshine. 
• It’s always best to select disease-resistant tomatoes. It’s always hard to know which disease, so select a variety with “VFN” after the name.
• Tomatoes are hungry plants; make sure you mix in organic matter and fertilizer when you prepare the soil. Many tomatoes don’t get enough nourishment as the soil fertility is too low. You’ll need to re-up the feeding with a balanced fertilizer after fruit set—mix into the soil every week. 
• Stake tomatoes right away to keep the fruit off the ground. Or, use a tomato cage.
• A few weeks after planting, mulch! 
• Check daily for pests or diseases so you can immediately address them.

Here are our 10 best tips about growing tomatoes to avoid the pitfalls!

Pruning Tips

• Never prune down determinate plants! They form flowers and fruit only at the tips of their branches. If you prune the suckers, you will cut off your future fruits and have lower yield.

Harvesting Tips

• As mentioned above, determinate tomatoes ripe in a few weeks for a defined harvest period. This is especially helpful if you want to use tomatoes to make a sauce or other recipe. 

All About Indeterminate Tomatoes

• Instead of bushy growth, indeterminate plants are huge vines sprawling 6 to 10 feet long or more. 
• The vines will keep growing until killed by frost. 
•  Instead of ripening all at once, indeterminate tomato plants produce a steady supply of fruit throughout the growing season.

• Though their growth may slow down later in the season as daylight wanes and nights cool off, they will continue to blossom and set new fruit.
• Many are late varieties which, if you are patient, will reward you with the largest and most flavorful fruit.
• Due to the higher leaf-to-fruit ratio and long ripening time, they have time to develop a sweeter and more complex flavor.
• Most heirlooms and open-pollinated varieties, including ‘Brandywine,’ ‘Delicious,’ ‘Black Krim,’ and Cherokee Purple’, are indeterminates.

Growing Tips

• Indeterminate tomatoes will definitely need some kind of support, such as stakes, tall, strong cages, or trellises. Look for large cages at least four feet tall and reinforce them with wood or bamboo stakes. Other good support materials include wooden or metal rebar stakes with additional twine or twist ties.

Pruning Tips

• If your indeterminate tomato plants get so high that you can’t support the plant anymore, you need to top them off.
• If you wish, you can pinch out suckers as the plants grow or prune the growing tips of the tallest vines to keep them in bounds without sacrificing all your fruit production. 
• For bigger tomatoes, remove the suckers, leaving 2 to 3 suckers. 
• Cut out lower branches or any branches that touch the soil.

Harvesting Tips

As indeterminate tomato plants just keep producing until fall frost kills the plant, keep harvesting regularly to keep the plants producing! Pick tomatoes when they are red or the right color and slightly soft to the touch. 

Pros and Cons

• Indeterminates have larger fruits. Determinates will have earlier fruits
• Indeterminates are strong enough to recover from early diseases and form new growth. If hit with early diseases, determinates will not recover.
• Determinants give you an early harvest so you can pull the plants when they are done to make room for fall crops. Indeterminate fruits ripen over a long period of time and will continue to grow until killed by frost, taking up a lot of room in your garden.
• Indeterminates can be pruned if necessary. Determinants need no pruning.

What is the Right Plant for You?

• The first consideration is the amount of space you have to grow them in. If it is limited then determinates are perfect for you.
• Next is when you want your tomatoes to ripen. If you crave early fruits or need a crop that ripens all at once for processing, again, determinates will fill the bill.
• If you are in search of large, flavorful slicers, then indeterminates may be a better choice for you.

Still Can’t Decide?

Some tomato varieties are classified as semi-determinate or semi-bush, which have traits of both determinate and indeterminate plants.

• They bear their fruit over a concentrated period of time like a determinate, but the plants grow a bit larger.
• Since they produce more branches, they will need more support like an indeterminate but will also produce more fruit
• Some semi-determinates are ‘Homestead’, ‘Marmande’, and ‘Celano’.

There is no single type of tomato that is perfect for everyone. If you are still undecided, try some of each and see what works best for you!

See more tips about choosing the right variety of tomatoes.

Whichever tomato you choose, they have common needs. Remember that it needs 6 to 8 hours of direct sun a day. Water consistently to prevent issues such as blossom-end rot and cracking. The fruits are 95% water! Steer clear of high-nitrogen fertilizers. They will make for lots of leafy growth but few fruits. Make sure your soil has sufficient potassium. It is the nutrient that governs the amount of fruit you get when it ripens, and its sugar levels.

See the Almanac’s Complete Guide to Growing Tomato Plants for more information from planting to harvest.