Indeterminate
A plant growth habit, most commonly used for tomatoes, in which the plant continues growing, flowering, and producing fruit throughout the entire season until killed by frost or disease. Indeterminate plants require staking or caging and ongoing pruning.
Indeterminate tomatoes grow continuously from transplant to frost. The main stem keeps elongating, and new flower clusters develop on new growth throughout the season. There’s no set endpoint to the plant’s growth - left to grow unmanaged in a warm climate, an indeterminate tomato vine can reach 10-15 feet. In most North American gardens, it grows until frost kills it.
Growth Pattern
The indeterminate growth habit means the plant is always doing two things simultaneously: vegetative growth (making new stems and leaves) and reproductive growth (setting and ripening fruit). This is efficient from a harvest perspective - you’re continuously picking ripe tomatoes from June or July until October, rather than getting everything at once.
The trade-off is management intensity. An indeterminate plant that isn’t pruned and supported becomes a dense, sprawling mass. Fruit buried in the canopy doesn’t get enough light to color properly. Disease spreads more readily in poor airflow. Ripe tomatoes touching the ground rot before you find them.
Pruning (Suckering)
Indeterminate tomatoes develop “suckers” - new shoots emerging from the crotch between the main stem and each branch. Left to grow, every sucker becomes a full branch, which develops its own suckers, and the plant rapidly loses all defined structure.
The typical management approach: remove all suckers up to the first flower cluster (“single-stem” training) or allow one or two main stems to develop (“double-stem” or “triple-stem” training). This keeps the plant’s energy concentrated in fewer stems producing larger fruit, and keeps the structure manageable on a trellis or cage.
Pruning is not strictly necessary for home gardeners who have space and don’t mind a chaotic plant. Unpruned indeterminate tomatoes produce more total fruit but smaller individual fruits, with more waste from poor light penetration and difficult harvest.
Support Requirements
Indeterminate tomatoes need substantial support. A 5-foot cage is typically too small for a full-season indeterminate - plants grow above it and fall over. A 6-foot stake, cattle panel arch, or Florida weave trellis system provides adequate support. For market gardens, a string trellis system suspended from overhead wire is the standard.
Common Indeterminate Varieties
Cherokee Purple (heirloom, slicing), Brandywine (heirloom, slicing), Sun Gold (cherry), Sweet Million (cherry), Mortgage Lifter (heirloom, large slicing), Jet Star (hybrid, slicing), Early Girl (hybrid, slicing).
When to Choose Indeterminate vs. Determinate
Choose indeterminate for: fresh eating across the whole season, cherry tomatoes (most are indeterminate), premium large-fruited varieties.
Choose determinate for: large one-time harvests for processing, container growing (compact varieties), short growing seasons.
Many gardeners grow both types: a few indeterminate plants for ongoing fresh eating plus a block of determinate paste tomatoes for late-summer canning.