Snapdragons are one of the most common garden plants in North America. With dozens of cultivars and varieties, they offer an enormous range of color with their showy flowers. There are three (3) primary subdivisions based off of height; dwarves (10-30 centimeters (4-12 inches) tall), intermediate (30-60 centimeters (12-24 inches) tall), and tall (60-90 centimeters (24-36 inches) tall).
Antirrhinum majus (Snapdragon)
Hardiness Zones: 7-10 (some cultivars may be hardy to zone 5 with adequete protection)
Height: 30-90 centimeters (12-36 inches) tall
Diameter: 15-30 centimeters (6-12 inches) across
Growth Rate: moderate to fast
Age: short-lived perennial (commonly grown as an annual)
Root System: delicate, easily disturbed
Subspecies: ” ‘Rocket’, ‘Bright Butterflies’, ‘Supreme Double’, with fine ruffled flowers, and the open-faced ‘Madame Butterfly’. ‘Monarch’, ‘Pixie’ and ‘Vanity Fair’ are Intermediate mixtures. Single type Intermediates include ‘White Wonder’, ‘Black Prince’, with dark purple leaves, and ‘Rembrandt’, which has gorgeous red and yellow bicolored flowers. ‘Coronette’, a mixture in the Intermediate group, is said to be especially tolerant of poor growing conditions. Popular Short snapdragons include the mixtures ‘Tom Thumb’ and ‘Floral Carpet’, and the bicolored ‘Peaches and Cream’. ‘Magic Carpet’ and ‘Little Gem’ are popular Dwarf mixtures.” (Floridata)
Problems (major): Rust, mold, fungal leaf spots, downy mildew, wilt, and root rot (among other fungal ailments) are unfortunately common and harmful.
Problems (minor): Aphids attack new foliage; dry soils are very harmful. Very hot summers and cold winters (freezing and below) inhibit growth.
Poisonous: none known (presumably no)
Soil requirements: Prefers moist, nutrient rich, slightly acidic, well-drained soils; sandy and loamy soils are acceptable. Does well in acid, neutral, and alkaline soils.
Air requirements: not sufficiently researched
Watering requirement: moderate
Sun requirement: full sun (preferred), part-shade (tolerated, especially during very hot summers)
Leaf shape: lanceolate, dark green
Leaf size: up to 3 inches long
Flower structure: These are two-lipped, concealing the stamens and carpels. Flowers come in almost every imaginable color, ranging from red to pink to purple to peach to orange to yellow to white, and occasionally multi-colored (true blue and true black are not yet present). Flowers are “perfect” (having both sex organs), and plants are monoecious.
Flowering frequency: April onward (typically until a fatal frost kills these)
The flowers are unique, coming in a very wide range of colors. The flower’s shape is very unique.
Commonly used as ornamental plants in gardens across North America.
Pink flowers with foliage and seed pods visible
Colorful yellow flowers
Bright red flowers
A cultivar with deep purple flowers being overwintered
White to lavender colored flowers
Several subspecies of snapdragon growing together
All of the images provided were taken by me. They may be used for educational/informational purposes only, provided that this article/blog is appropriately cited first.