Snapdragon Identification Guide

Key Identifying Features

Snapdragons (Antirrhinum majus) are short-lived perennials grown as cool-season annuals in the plantain family (Plantaginaceae). They get their name from a charming flower trick. Look for:

• Tall vertical spikes of densely packed flowers.
• Two-lipped, pouched (closed) flowers that "snap" open like a dragon's mouth when pinched at the sides.
• Narrow lance-shaped leaves on upright stems.

Leaves & Stems

Snapdragon leaves are lance-shaped to narrowly oblong, 1–3 inches long, smooth-edged, and bright to deep green. They are arranged alternately (sometimes opposite low on the stem) along erect, sturdy, often branching stems. Plants range from dwarf (6 inches) to tall (3 feet) depending on variety. Stems are green, sometimes flushed reddish, and somewhat firm. The overall form is upright with the flower spike topping each stem.

Flowers & Fruit

The flower is the key ID feature: a two-lipped (bilabiate) tubular bloom with an upper and lower lip that close over a pouch-like throat. Squeezing the sides makes the "jaws" snap open — a definitive test. Flowers crowd into a terminal raceme (spike) that opens from the bottom upward. Colors are vast — red, pink, yellow, orange, white, purple, bronze, and bicolors — but never true blue. Bloom peaks in cool spring and fall. After flowering, a distinctive skull-like seed capsule with holes forms, sometimes called a "dragon skull."

How to Tell It Apart from Look-Alikes

• Toadflax (Linaria): Related and similar two-lipped flowers, but much smaller with a long backward spur, and airy, finer foliage.
• Penstemon: Tubular two-lipped flowers too, but open-mouthed (not snapping closed) and arranged in looser, more open clusters.
• Foxglove (Digitalis): Tall spikes of tubular flowers, but bells are open-throated and spotted inside, not pinched into snapping lips.

The closed two-lipped flower that snaps open when squeezed, plus the skull-like seed pods, are unique to snapdragons.

Where You'll Find It

Snapdragons are popular bedding, border, and cut-flower plants for cool seasons. They prefer full sun and well-drained soil and tolerate light frost, blooming best in spring and fall and through mild winters; they fade in summer heat. You'll find them in flower beds, cottage gardens, and cutting gardens, and they sometimes self-seed and naturalize on walls and waste ground.

Quick ID Checklist

• Tall flower spike opening bottom to top
• Two-lipped pouched flowers that snap open when squeezed
• Narrow lance-shaped leaves on upright stems
• Wide color range but no true blue
• Skull-like seed capsules after bloom
• Peak bloom in cool spring and fall