tomato plant Identification (Solanum lycopersicum)

Check the overall shape and flower-fruit details of Solanum lycopersicum.

• An upright, branching herb with soft green stems, often sprawling or needing support.
• Leaves are alternate, unevenly divided, and usually 4 to 10 inches (10 to 25 cm) long.
• Leaflets and lobes have irregular edges, giving each leaf a coarse, feathery outline.
• Flowers are yellow, star-shaped, and typically have 5 pointed petals.
• Fruits are smooth, round to slightly flattened berries that develop on short hanging clusters.

Look for the combination of lobed leaves, yellow five-pointed flowers, and fleshy berries.

Solanum lycopersicum shows clear visual changes from seedling leaves to flowers and fruits.

• Seedling: Seedlings first show two narrow seed leaves, then small true leaves with shallow lobing and fine hairs on soft, green stems.
• Young plant: Young plants become bushier or vining, with larger compound leaves, stronger lobing, and thicker hairy stems, often reaching 12-24 inches (30-60 cm).
• Flowering stage: Flowering stems carry small yellow, star-shaped flowers in clusters; the pointed green sepals remain obvious behind each flower and later around developing fruit.
• Fruiting stage: Fruiting plants are easy to confirm by smooth green berries that enlarge and ripen to red, yellow, or orange, hanging singly or in clusters.

Several tomato plant cultivars are easy to separate by fruit shape, color, and plant habit.

• 'Roma': Produces elongated, egg-shaped red fruits, usually about 2-3 inches (5-8 cm) long, rather than the typical round tomato.
• 'Beefsteak': Bears very large, flattened round fruits, often 4-6 inches (10-15 cm) wide, on tall, vigorous vines.
• 'Yellow Pear': Has small pear-shaped yellow fruits, usually about 1-2 inches (2.5-5 cm) long, instead of round red fruits.
• 'Tiny Tim': Forms a dwarf, bushy plant often under 18 inches (46 cm) tall, much shorter and denser than standard indeterminate types.

From summer into fall, tomato plant becomes easier to recognize as yellow star-shaped flowers give way to enlarging green fruit, then red, orange, or other ripe fruit depending on the variety. After frost or at the end of the growing season, foliage collapses and the plant usually dies back, leaving bare, drying stems and any remaining fruit visible for a short time.

A few nightshades can be mistaken for a tomato plant at a glance.

• Non-fruit parts: Leaves, stems, and unripe green fruit contain glycoalkaloids. This is mainly an ingestion concern for humans and pets.
• Pet risk: Tomato plants and green fruit are considered toxic to dogs and cats if eaten. The ripe red fruit is not the concern here; the foliage and unripe parts are.