Ornamental · Plantaginaceae
Angelonia
Angelonia angustifolia
Hand it full sun and heat, and angelonia just keeps throwing up spires of bloom from summer to fall.
Full sun
USDA 9–11
12–18 in · 30–46 cm
Overview
Angelonia, also called summer snapdragon, is the plant that actually likes the heat. While the rest of the flower bed wilts and sulks through July, this one keeps sending up slim spires of purple, pink, white, or blue, right from early summer into fall. The name comes from the snapdragon-shaped flowers, but here's the thing: it's really in the family Plantaginaceae, and it skips all the fussiness a real snapdragon would give you.
It grows into a neat little mound, 12 to 18 inches (30 to 46 cm) tall, and it's happy in a border, a big mass planting, or just a pot by the door. It's only hardy in zones 9 to 11, so most folks just grow it as a warm season annual and pop in new ones every spring. Give it sun and warmth and honestly, it barely asks for anything back.
The best part? It's about as low-maintenance as flowers get. Once it's rooted in, it shrugs off dry spells and humidity, never wants deadheading, and pests mostly leave it alone. Stick it where the sun's full, keep the soil draining nicely, and it pretty much runs itself all season.
Care
The short version: full sun, warmth, and soil that drains well. Keep it watered while it's getting settled, then let it coast through dry spells once it's established, and shear it back by half around midsummer if it starts to look tired.
Light
Angelonia wants full sun, and the more the better. Pile on the direct light and the plant gets fuller and blooms way more, while too much shade just leaves it thin, floppy, and slow to flower.
Water
Keep the soil evenly moist while it's getting established, then back off once the roots have a real grip. After that it handles dry spells just fine and the soil can dry out between waterings, as long as the drainage is sharp. The one thing it won't put up with? Soggy ground, so when in doubt, lean dry.
Soil
Plant it in moist, fertile soil that drains freely. Rich ground keeps that long bloom going, but standing water is what brings on root rot, so loosen up any heavy soil with compost and make sure the water's got somewhere to drain off to.
Humidity
Heat and humid air don't faze angelonia one bit, so there's no humidity number to fuss over. What actually matters is airflow, because still, muggy air around crowded plants is exactly what lets powdery mildew get going.
Feeding
Mix a slow-release landscape fertilizer into the soil when you plant, then top it up about every two months through the growing season. If your soil's on the lean side, a liquid feed every so often keeps the flowers coming.
Pruning
No deadheading to keep up with, since the plant cleans itself. If it starts stretching out or looking tired by midsummer, just shear it back by about half and it'll be flowering again within 2 to 3 weeks.
Size & spacing
Each plant gets 12 to 18 inches (30 to 46 cm) tall and spreads 8 to 12 inches (20 to 30 cm) wide. Give every one that much room so air can move through the planting and mildew stays away.
When to plant
Angelonia's all about warmth and has zero tolerance for frost, so timing really matters here. Start seed indoors in late winter, wait to set plants out until the cold's truly done and the soil's warmed up, and you'll have flowers from early summer straight through that first chilly snap of fall.
Northern hemisphere
Southern hemisphere
Typical months for a temperate climate: start earlier in warm zones, later where spring frosts linger.
- Sow: Start seed indoors about 6 to 8 weeks before the last spring frost; seed needs light to germinate and sprouts in 7 to 14 days.
- Plant: Transplant outdoors after the last frost when soil and air have warmed.
- Harvest: Blooms from late spring or early summer through early fall (about June to September); allow roughly 13 to 14 weeks from sowing to flower.
Hardiness
USDA hardiness zones: 9–11
Temperature: down to -7°C
Troubleshooting
Here's the good news: angelonia is one of the easiest annuals you can plant, and most of what goes sideways comes back to soggy soil or stale, still air. Get familiar with the handful of signs below and you can jump on a problem early. Match what you're seeing, then act while it can still do some good.
A plant flopping over even though the soil's still wet
When a plant wilts but the ground's still soggy, the usual culprit is Phytophthora root and stem rot, a water mold that thrives wherever the soil just won't drain. The roots and the bottom of the stem go brown and mushy, and honestly, once it's that far along there's no bringing it back. Pull and toss the worst ones, back way off the watering, and replant somewhere the drainage is good and sharp.
Fix:
- Remove and discard severely affected plants
- Improve drainage and reduce watering frequency
Leaves and stems looking like they got dusted with flour
That whitish dust is powdery mildew, a fungus that loves spots where the air goes still and the leaves stay damp. So what helps? Water down at the soil instead of over the leaves, open up any crowded growth so a breeze can slip through, and pluck off whatever's coated the worst. Keep a plant in full sun with a bit of breathing room and it hardly ever shows up.
Fix:
- Improve air circulation by spacing plants properly
- Avoid wetting foliage and water at the base
- Remove badly affected foliage
New shoots curling up with little bugs piled on them
Those tiny soft specks bunched on the new tips? Those are aphids, and that sticky shine they leave behind is honeydew. A good hard spray of water knocks most of them off, and if a few stubborn ones keep coming back, insecticidal soap takes care of it. Lady beetles and other helpers usually mop up the rest, so it's smart to ease up on the nitrogen, since that's what pulls the aphids in.
Fix:
- Dislodge aphids with a strong spray of water
- Apply insecticidal soap if populations are high
- Encourage natural predators such as lady beetles
Toxicity
Got pets or kids? Good news here, because angelonia isn't listed as toxic. The ASPCA leaves it off both its cat and dog lists, and there aren't any known poisons in the leaves or flowers. A curious nibble could upset a sensitive tummy the way any new plant might, but the plant itself is totally safe.
Safe for
People · Cats · Dogs · Horses · Rabbits · Livestock · Birds
Cats None
Angelonia didn't make the ASPCA's toxic list, so if a nosy cat decides to chew a leaf, there's nothing here to worry about.
Dogs None
Dogs are fine with it too. Sure, a big mouthful might upset a touchy stomach the way any odd plant can, but there's no actual toxin in it.
Horses Safe
Horses are in the clear, since nothing in angelonia is known to hurt them, even if one grabs a grazing bite.
Rabbits Safe
Rabbits can munch the leaves and flowers no problem, though a really hungry one might chew a young plant clear down to the stem.
Livestock Safe
Cattle, goats, and sheep have nothing to fear from angelonia, whether it's growing in the pasture or along a border.
Birds Safe
Birds that peck at the leaves or spent blooms won't come to any harm from it.
People Safe
Nobody grows angelonia to eat it, but there's no toxin in it, so if a kid tastes a flower they'll be perfectly okay.
Varieties
Angelonia comes in both seed-grown series and vegetative ones, and the vegetative types are bred for bigger flowers and kept true by cuttings. A few names pop up over and over at the garden center, so they're easy to recognize.
Serena and Serenita series
These are compact ones you can grow from seed, and they come in purple, lavender pink, and white.
Archangel series
These are grown from cuttings instead of seed, and they've got bigger flowers in shades like blue and pink.
Night Sky
This one's got deep purple flowers that are freckled all over with little white dots.
How to propagate
Want more angelonia? You can grow it from cuttings or from seed, and which way you go really just depends on how much time you've got and whether you want an exact copy of a favorite.
Stem cuttingsEasy
During active growth in the warm season. · A few weeks to root and establish.
Got a plant you really like? Tip cuttings are the fastest way to copy it. Snip them while it's growing strong in the warm season, pop them in a moist medium, and they'll root and settle in within a few weeks. It's actually the same way growers keep those named vegetative series true to their colors.
SeedEasy
Start indoors 6 to 8 weeks before the last frost. · Germinates in 7 to 14 days with light; about 13 to 14 weeks from sowing to flower.
Seed takes a little more patience, but it'll get you loads of plants. Sow indoors 6 to 8 weeks before the last frost and leave the seed sitting on top, because it needs light to wake up, which takes 7 to 14 days. After that, figure on roughly 13 to 14 weeks from sowing before the first flowers show.
Myths
Angelonia needs constant deadheading to keep blooming.
Nope, angelonia tidies itself up and just keeps blooming with zero deadheading on your part. If it's looking a little tired by midsummer, one shearing by half brings the flowers back within 2 to 3 weeks.
Angelonia is a true snapdragon.
That nickname, summer snapdragon, is all about the flower shape and nothing about the family tree. It's Angelonia angustifolia in the family Plantaginaceae, so it isn't related to the real snapdragon, Antirrhinum, at all.