Ornamental · Plantaginaceae
Snapdragon
Antirrhinum majus
Tuck a few snapdragons into a sunny bed and watch tall, cheerful spikes of spring and fall color rise with almost no fuss.
Full sun
USDA 7–10
0–3 ft · 0.2–0.9 m
Overview
The snapdragon gets its playful name from a simple garden trick: squeeze the sides of a bloom and it opens and closes like a little mouth, something children have delighted in for generations. It belongs to the genus Antirrhinum and lifts tall, flower-packed spikes in almost every shade except true blue. Best of all for a first-timer, it feels right at home in the gentle weather of spring and fall.
Do not let its upright, showy habit fool you into expecting a plant that lives forever. Snapdragon is a tender perennial that most gardeners simply grow as an annual, since it only makes it through winter in mild spots around USDA zone 7 and warmer. Heights run from ankle-high dwarfs to waist-high cutting types, so there is a snapdragon to suit a front edge, the middle of a border, or a jar on the kitchen table, and any of them is forgiving to grow.
Hand it full sun and rich, evenly moist soil, and honestly it asks for very little in return beyond snipping off the faded blooms now and then. The flowers are safe for pets and people alike, and edible on top of that, so this is a lovely, low-worry pick for a family garden. If there is one thing to know, it is that summer heat pauses the show, and the flowers pick right back up once cooler days return.
Care
The short version: give snapdragons full sun, rich soil that stays evenly moist but drains well, and a little regular deadheading, and they will keep the spikes coming. Lean on them for spring and fall, because summer heat quietly stalls the bloom.
Light
Snapdragons put on their fullest show in full sun. In too much shade they stretch and bloom sparsely, so a bright, open spot is the kindest thing you can give them to keep the spikes strong and colorful.
Water
Aim to keep the soil evenly moist, because snapdragons do not handle drought well and dislike drying out. Water gently at the base and try to keep the leaves dry, which quietly protects them from rust and Botrytis.
Soil
They settle in happily in rich, well-drained soil that holds moisture, with a pH close to neutral. Loose ground that stays damp without turning soggy gives the roots the steady, easy conditions they love.
Humidity
Average
Feeding
A single feeding with an all-purpose fertilizer in spring, as new growth wakes up, is all these cool-weather plants really need. There is no reason to push them with extra, so keep it simple and let them go.
Pruning
Deadheading the spent flowers keeps fresh spikes coming and stretches the bloom season for you. While you are at it, tidy away any damaged or diseased growth to keep each plant open and healthy.
Size & spacing
Depending on the type, plants stand anywhere from 6 to 36 inches (15 to 91 cm) tall. Give them 6 to 10 inches (15 to 25 cm) of room apart so air can move freely, which makes life much harder for disease.
When to plant
Snapdragons are happiest when the air is cool rather than hot. Set them out in early spring once the last frost has passed, or plant in fall where winters stay mild around USDA zone 8 and warmer, and they will flower through the soft stretches of spring and autumn before the heat asks them to rest.
Northern hemisphere
Southern hemisphere
Typical months for a temperate climate: start earlier in warm zones, later where spring frosts linger.
- Plant: Early spring after the last frost, or in fall in mild zones (about USDA zone 8 and warmer)
- Harvest: Blooms in cool weather of spring and fall (and summer in cool climates); flowering slows in summer heat
Hardiness
USDA hardiness zones: 7–10
Temperature: down to -18°C
Troubleshooting
Most snapdragon hiccups trace back to damp, crowded leaves or simply the wrong time of year, and nearly all of them are recoverable. Keep a friendly eye on the lower leaves and stems, where trouble tends to show up first. Find the match below and step in early, and your plants will usually bounce back just fine.
Yellow flecks on top, dusty dark spots beneath
What you are seeing is snapdragon rust, the plant's best-known disease, and it takes hold when leaves stay wet for 6 to 8 hours in cool 55°F to 70°F (13°C to 21°C) weather. Warmth above 80°F (27°C) actually holds it back, which is reassuring. Gently pick off and bag the spotted leaves, keep water off the foliage, and start with rust-resistant cultivars next time for real peace of mind.
Fix:
- Remove and bag affected leaves
- Apply a labeled systemic fungicide if severe
Twisted yellow leaves with gray fuzz below
Downy mildew most often rides in on infected plugs, so those distorted, yellowing leaves with gray spores underneath are usually a problem that came home with the plant rather than one you caused. Sadly an infected plant cannot be saved, so pull it and destroy it. Give anything new a good look before it joins the bed, skip overhead watering, and leave room for air to move.
Fix:
- Remove and destroy infected plants
Tan cankers on the stems of crowded plants
This is Botrytis gray mold, and it moves in when the air is humid and still around plants packed too closely together. Snip out the infected stems and any rotting tissue, then thin things a little so a breeze can pass through. Watering at the base instead of overhead keeps the leaves dry and takes the wind out of the mold's sails.
Fix:
- Remove and destroy infected plant parts
- Improve air circulation
Blooming stalls when summer turns hot
Snapdragons are cool-season plants with little patience for heat or drought, so the flowers slow or stop once temperatures settle above about 80°F (27°C). This is not a disease at all, just the wrong season, so there is nothing to fix. Cut the plants back, keep the soil watered, and many will happily flower again as fall cools things down.
Fix:
- Cut plants back and keep them watered; they may rebloom as temperatures cool
Toxicity
Here is a comforting bit of news for pet owners: garden snapdragon is non-toxic to cats, dogs, and horses, and the ASPCA confirms it. The flowers are even edible for people. Plant it wherever curious animals or little ones might wander, and you can relax.
Safe for
People · Cats · Dogs · Horses · Rabbits · Livestock · Birds
Cats Safe
The ASPCA lists garden snapdragon as non-toxic to cats, so a curious nibble will not do a cat any harm.
Dogs Safe
Dogs are safe around snapdragon, and a chewed leaf or flower is nothing to worry about, though a big binge on any plant might unsettle a tummy for a day.
Horses Safe
Horses can graze right beside snapdragons without any risk, since the ASPCA notes no toxicity for them.
Rabbits Safe
Rabbits are in no danger from snapdragon foliage, so a stray plant within their reach is perfectly fine.
Livestock Safe
Cattle, goats, and sheep handle snapdragon without trouble, as it holds no known toxin for grazing animals.
Birds Safe
Snapdragon is no threat to birds pecking at the blooms or seed, so they are welcome to it.
People Safe
The flowers are edible and often show up as a garnish, though they can taste a little bitter, and the whole plant is safe to have around children.
Varieties
Snapdragons sort themselves mostly by height, from tiny edgers to tall stems for cutting. Here are the main groups worth getting to know before you pick your seeds.
Dwarf (such as Floral Showers, Snapshot)
These compact little plants hold at around 6 to 10 inches tall, which makes them a sweet, tidy choice for edging a path or brightening a container.
Medium (such as Liberty Classic, Snaptastic)
Reaching roughly 12 to 22 inches, these middle-sized types settle comfortably into the heart of a bed or border.
Tall or Rocket (such as Rocket, Potomac, Madame Butterfly)
Grown mainly for cutting, these tall spikes climb from 24 to 60 inches and hand you long, generous stems for the vase.
Trailing (such as Candy Showers)
With a soft cascading habit that rises about 6 inches and spills to roughly 12 inches, these are made to tumble happily over the side of a hanging basket.
How to propagate
Snapdragons come almost entirely from seed, started in cool weather for a spring or fall display, and it is an approachable way to fill a bed.
SeedModerate
Sow in cool weather for spring or fall display · Several weeks from germination to transplant size
Nearly every snapdragon starts life as seed sown in cool weather for a spring or fall display, so it is a friendly place to begin. The seedlings need several weeks to reach transplant size, so give yourself a head start. Once the young plants are up, pinch the tips and you will coax out bushier, branching growth and even more flower spikes.
Myths
Snapdragons are dependable perennials that return every single year.
In truth, Antirrhinum majus is a short-lived tender perennial, and most gardeners treat it as an annual. It comes back year to year only in mild climates, roughly USDA zone 7 and warmer, where winters stay soft enough to spare the crown, and that is perfectly fine.
Snapdragons will poison your pets.
You can set this worry down: the ASPCA lists garden snapdragon as non-toxic to cats, dogs, and horses. Plant it where animals roam without fretting over a nibbled leaf, and know the flowers are even edible for people.
Snapdragons flower best in the summer heat.
They are actually cool-season bloomers, at their loveliest in spring and fall. Once summer settles in, the flowers slow or pause, then return happily when mild weather does.