How to Know if Tomato Plant is Indeterminate or Determinate

Tomatoes are commonly classified into two main categories, determinate and indeterminate. These categories refer to the growth habit of the tomato plant. Determinate tomatoes have an inherent trait that causes them to stop growing once they reach a certain height, whereas indeterminate tomatoes will continue growing and producing fruit throughout the entire growing season until the plants are killed by frost.

Appearance of Plant

The easiest way to distinguish between a determinate and indeterminate tomato plant is by observing its growth habits. Determinate tomato plants have a bush-like habit and are usually shorter in height, reaching a maximum height of around 4-5 feet. The plant will produce a finite number of lateral branches and will generally stop growing once the terminal (topmost) bud produces fruit.

Indeterminate tomato plants, on the other hand, have a vining habit and will continue to grow upwards and outwards throughout the season. They will grow taller than determinate plants and can reach a height of up to 12-15 feet with proper support. Indeterminate tomato plants will produce lateral branches and flowers continuously and will produce fruit until the plants are killed by frost.

Flower and Fruit Production

Another way to distinguish between determinate and indeterminate tomato plants is by their flower and fruit production. Determinate tomato plants will produce a large quantity of fruit over a short period. The time frame for fruit production is generally around three to four weeks from the time the plant flowers. After that, the plant will stop producing fruit, and the foliage will begin to die back. Indeterminate tomato plants, however, will produce fruit over a more extended period. The plant will continue to flower and produce fruit throughout the growing season.

Growing Habits

Finally, the growing habits of determinant and indeterminate tomato plants are also different. Determinate tomato plants are ideal for container or patio gardening, as their compact size requires less staking, pruning, and maintenance. Indeterminate tomato plants require more significant space to grow as they are taller and require support systems such as staking or cages. Additionally, indeterminate tomatoes will need regular pruning to control their growth and maintain the quality and quantity of their fruit yield.

Closing Thoughts

In conclusion, determining whether a tomato plant is determinate or indeterminate is relatively easy. Observing the plant’s growth habits, such as its appearance and fruit production, can differentiate between the two types of tomato plants. Understanding the growth habits of the plant can help you choose the perfect plant for your space and ensure a great harvest.