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Snapdragons - Growing and Caring for Snapdragon (Antirrhinum majus) Plants

By , About.com Guide

Photo: © Marie Iannotti

Snapdragons come in almost every color and some bi-color blends, like the coral/yellow here.

Photo: © Marie Iannotti

Latin Name:

Antirrhinum majus

Common Name:

Snapdragon, Dog's/ Lion's/Toad's Mouth

Overview:

Snapdragons have stalks of brightly colored flowers that are especially profuse in cooler weather. They start blooming at the bottom of the stalk and work their way up. The common names all derive from the way the flowers look like opening mouths, when they are pressed on their sides. The flowers are snapped shut and require more pressure to open than a honeybee can provide, so snapdragons rely on heavier bumble bees for their pollination.

The Latin name, Antirrhinum, means "like a snout" and refers to the seed pod's resemblance to a calf's nose. How do such charming flowers wind up with such ungracious names?

Description:

Snapdragons are bushy plants with tall spikes of flower buds. Most are intensely colored and real standouts in the garden.

Leaves:

Flowers: The flowers come in just about every shade, except true blue. Some are vibrant bold tones, some are soft pastels and some are subtly shaded bi-colors. Caution: All parts of snapdragon are poisonous, if ingested.

Hardiness Zones:

USDA Hardiness Zones 4 - 11, depending on variety. Snapdragons are tender perennials, but they're most commonly grown as annuals.

Exposure:

Full sun to Partial Shade.

Mature Size:

8 - 36" (h) x 12 -15"(w)

Bloom Period:

Can repeat bloom throughout the season, but does its best in the cool of spring and fall and throughout the winter, in mild climates.

Suggested Varieties:

They're continually coming out with new snapdragon series. Most are sold as multi-color blends, but you can sometimes find individual colors in both seed and seedling. Some of the more popular series include:
  • Antirrhinum majus Arrow™ Formula Mix - Vivid colors on strong, branching stems. Grows 2' tall.

  • Antirrhinum majus La Bella Mix
  • - A nice blend of colors from pale to bronze to deeply saturated. Grows 12 - 18" tall.

    Antirrhinum majus Rocket Mix - a dependable multi-colored series that grows to about 2 - 3' tall.

Design Suggestions:

Their spiky, bright colored flower stakes make a nice foil for the cooler shades of most spring flowers, like Brunnera and Bleeding Heart. Planted in clusters, they can help a border transition from the spring ephemerals to peak heat season.

The pale yellow varieties are the easiest to blend into a mixed border and work nicely with pinks, purples and even reds.

Breeders have been playing with snapdragons for a few years now and there are trailing and creeping varieties becoming more widely available. These are great filler plants for containers, baskets and tucked into walls.

Growing Tips:

Soil: Snapdragons like a neutral soil pH, between 6.2 and 7.0.

Planting:

Snapdragons can be winter sown, meaning you can toss the seeds out in late fall or even on top of snow, and most will germinate in the spring.

However snapdragons are most often either started indoors, 8 - 10 weeks before the last frost date, grown from cuttings or purchased as seedlings. When starting from seed, simply press the seed on the surface of the potting soil. Snapdragon seeds need light to germinate.

When seedlings have developed about 6 true leaves, pinch the top of the stem off, to encourage branching and a fuller plant. You can do this with purchased seedlings too.

Transplant snapdragons outdoors a couple of weeks before your last frost date. Snapdragons can handle a light frost or two.

Maintenance:

Regular deadheading will keep your snapdragons blooming longer. Snapdragons are tender perennials and may die off in colder climates. If they do survive the winter, prune them back by about 1/3, to encourage new growth. Don't be too disappointed if they don't last long. Snapdragons tend to go downhill after their first year and it's best to start fresh every year. Many varieties will self-seed and come back on their own, although they won't always look like the original plants you planted.

Some of the taller varieties will need staking.

Pests & Problems:

Snapdragons are affected by few pests or diseases. Rust and other fungal diseases can be a problem, especially in wet seasons. If you live in a damp or humid area, look for resistant varieties. Snapdragons may also attract aphids.
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