Ornamental · Asteraceae
Goldenrod
Solidago canadensis
Give it full sun and lean soil, and goldenrod lights up the late-summer garden and brings in every pollinator around.
Full sun
Every 7–14 days
USDA 4–9
2–6 ft · 0.6–1.8 m
Overview
Goldenrod is that plant that turns fields and roadsides pure gold come late summer, with plumes of tiny flowers riding on tall, leafy stems. It's part of the aster family, and it grows wild across most of North America as a tough, long-lived perennial. The best part? It asks for next to nothing and hands you weeks of color right when everything else is fading out.
When it comes to pollinators, few plants pull their weight like this one. The flowers are alive with bees, butterflies, and good insects exactly when food's getting scarce, and the seedheads keep birds fed through the cold months. So if you're building a garden for wildlife, goldenrod's a natural anchor.
The one catch? It loves to spread. Tall goldenrod travels through a bed by rhizome and self-seeds like crazy, so it'll elbow out gentler neighbors if you let it. But don't sweat it, just pick a clump-forming species for a neat border, or plan to divide the pushy types every few years to keep them in line.
Care
The short version: full sun and plain to poor, well-drained soil, and you're basically set. Water it through long dry spells but otherwise let the rain do the job, don't bother feeding it, and split up the vigorous clumps every few years so they don't run wild.
Light
Goldenrod wants full sun if you want it flowering hard and standing up straight. It'll take a bit of partial shade, sure, but the stems start stretching and flopping and the blooms thin out the darker its spot gets.
Water
It likes soil that stays evenly moist but never soggy, and once it's established it shrugs off a short dry stretch no problem. In most temperate gardens the rain handles the watering for you, so you'll only need to step in during a prolonged drought.
Soil
It'll grow in clay or loam as long as the water drains off, and it forgives poor ground that would stop pickier plants cold. Any pH from 5.5 to 7.5 works fine, and honestly, lean soil actually keeps the growth nice and sturdy.
Temperature
Goldenrod is seriously tough, taking cold all the way down to -29°F (-34°C) and heat past 95°F (35°C) without blinking. That's exactly why it grows on its own across so much of the continent.
Humidity
Regular outdoor humidity is all it wants, so there's no number to stress about. What matters way more is air movement, since still, muggy air is what tempts rust and powdery mildew onto the leaves.
Feeding
You can skip the fertilizer everywhere except the really poor spots. Goldenrod actually loves lean soil, and too much nitrogen just gives you floppy, weak-stemmed plants, so at most treat it to a light spring topdressing of compost.
Pruning
Snip off the spent flower stems after they bloom, or leave the seedheads up to feed the birds all winter, your call. Cut everything to the ground in late winter before new shoots show, and a quick pinch in early summer keeps the tall ones from flopping over.
Size & spacing
Plants run from 2 to 6 feet (61 to 183 cm) tall and spread 4 to 6 feet (122 to 183 cm) wide, so give each clump some real elbow room. That wide spread is also why the pushy species need dividing to stay put where you planted them.
When to plant
Goldenrod pretty much runs on the calendar. Start seed in late winter or sow it outside in fall, get young plants in the ground come spring once frost's done, and then just enjoy the flowers pouring out from late summer well into fall.
Northern hemisphere
Southern hemisphere
Typical months for a temperate climate: start earlier in warm zones, later where spring frosts linger.
- Sow: Late winter, 8 to 10 weeks before last frost; seeds benefit from cold-moist stratification and need light to germinate
- Plant: Spring after the last frost, or in early fall
- Harvest: Late summer through fall (August to October)
Hardiness
USDA hardiness zones: 4–9
Temperature: down to -34°C
Troubleshooting
Goldenrod hardly ever runs into anything serious, and most of what does pop up is just cosmetic. Crowding and wet leaves cause the bulk of it, so good airflow fixes more than any spray ever will. Just find what you're seeing below and step in only if it's actually bugging you.
Orange powdery bumps hiding under the leaves
See orange or brown blisters on the underside of a leaf that smear into powder when you touch them? That's rust, a fungus, and it's more annoying than dangerous. It really gets going in crowded, damp clumps, so pull off the worst leaves, thin or divide things out for better airflow, and try to water down at the roots instead of over the top.
Fix:
- Remove and destroy heavily infected leaves
- Improve air circulation by thinning or dividing crowded clumps
- Avoid overhead watering and water at the base
A whitish film settling over leaves and stems
A gray-white dusting on the leaves is powdery mildew, and it usually turns up late in the year once the nights get muggy or the plant's stuck in shade. It looks a lot worse than it really is, and it hardly ever kills a settled clump. Just cut off the coated growth, let in more sun and air, and rake up the leftovers before winter.
Fix:
- Cut back affected foliage
- Increase spacing and sun exposure to improve air movement
- Remove infected debris at season end
Little insects bunched up on the new shoots, kind of sticky
Those little soft-bodied bugs bunched up on the new growth and flower buds are aphids, and the sticky honeydew they leave behind tends to bring ants along too. Here's the thing: goldenrod feeds so many good insects that a few aphids aren't worth worrying about. Blast the thick clumps off with a strong jet of water, and only bother with insecticidal soap if they just won't leave.
Fix:
- Spray off with a strong jet of water
- Tolerate where possible since goldenrod supports many beneficial insects
- Use insecticidal soap only if infestation is heavy
Round swollen bumps popping up along the stems
Those odd round or spindle-shaped bumps on the stems are galls, and they show up when the goldenrod gall fly lays an egg and a larva grows inside. Good news: they hardly ever hurt the plant, and they actually feed birds and other critters right through winter. If you don't like the look, snip the bumpy stems off, but honestly, leaving them there does no harm at all.
Fix:
- Prune out and discard galled stems if appearance is a concern
- Otherwise leave in place as galls rarely harm the plant and feed wildlife
Toxicity
Goldenrod's safe right across the board, with no part of it toxic to people, pets, or livestock. Yeah, it gets blamed for hay fever, but that's really ragweed's fault, not its. So plant it wherever kids and animals wander, and you can even steep the leaves into a nice herbal tea.
Safe for
People · Cats · Dogs · Horses · Rabbits · Livestock · Birds
Cats None
Cats are fine around goldenrod, since there's nothing in the leaves or flowers that'll hurt them. And if a nosy cat sneaks a bite? At worst you'd see a quick, mild tummy grumble, just like with any plant a cat isn't really meant to eat.
Dogs None
Dogs can hang out near goldenrod no problem, because it doesn't carry any toxic stuff. A dog that scarfs down a big mouthful of leaves might drool a bit or have a loose stool, but that sorts itself out pretty quickly.
Horses Safe
Horses are safe grazing near true goldenrod, and it shows up in loads of pastures without any fuss. Just don't mix it up with the toxic lookalike people sometimes confuse it for, because the real thing is harmless to them.
Rabbits Safe
Rabbits can nibble goldenrod safely, and wild ones do it all the time. There aren't any toxins in the leaves or flowers, though it's smart to ease in any new green slowly, the way you would with anything fresh.
Livestock Safe
Cattle, goats, and sheep are all okay around goldenrod, with nothing in it to harm them. It's not toxic, and they'll usually walk right past it for softer, tastier forage anyway.
Birds Safe
Birds have nothing to fear from goldenrod, and they actually love it, tucking into the seeds and snapping up the insects its flowers pull in. There's not a thing about the plant that's bad for them.
People Safe
Goldenrod's safe for people too, and folks have brewed its leaves and flowers into a herbal tea for ages. And no, it doesn't cause hay fever, whatever you've heard, because its pollen is way too heavy to ride the wind to your nose.
Varieties
Goldenrod isn't just one plant, it's a whole genus, and the different species really vary in size and how well they behave. Here are the ones worth getting to know before you plant.
Solidago rugosa 'Fireworks'
A tidy little one at 3 to 3.5 feet that fans out arching sprays of tiny flowers like a burst of fireworks, and it creeps by rhizomes without ever going rogue.
Solidago canadensis
This is the big, energetic species that hits 2 to 6 feet with wide pyramid-shaped flower heads, and it gets around fast by both seed and rhizome.
Solidago speciosa (Showy goldenrod)
An upright clump-former that's totally happy in poor, dry ground and stays way better behaved than its tall cousin.
Solidago caesia (Bluestem/wreath goldenrod)
A woodland type with bluish arching stems that tucks its flowers into the leaf joints and handles shade just fine.
How to propagate
Making more goldenrod is a breeze, whether you split a clump you've already got or start over from seed.
DivisionEasy
Spring or early fall; divide established clumps every 2 to 3 years to control spread and maintain vigor · One growing season
Splitting a clump is the easiest way to get more goldenrod, and it doubles as a handy way to keep a spreader from taking over. In spring or early fall, dig the plant up, pull it apart into chunks that each have roots and shoots, and pop them straight back in the ground. Do it every 2 to 3 years and the clump stays lively, and it'll settle in again inside one growing season.
SeedEasy
Sow in fall outdoors or stratify and start indoors in late winter · Blooms typically in the second year from seed
Growing goldenrod from seed is easy, as long as you've got a little patience and remember it needs light. Scatter the seed on the surface outdoors in fall, or chill it and start it indoors in late winter, but whatever you do, don't bury it, because it won't sprout in the dark. You'll usually get flowers the second year, and after that it'll self-seed all over the place on its own.
Myths
Goldenrod is what has everyone sneezing all through allergy season.
Here's the truth: goldenrod probably isn't what's making you sneeze. Its pollen is big, sticky, and heavy, so insects carry it flower to flower and it barely ever floats off on the breeze. The real troublemaker is ragweed, which flowers at the exact same time and pumps out clouds of light, wind-borne pollen, while goldenrod just happens to be the showy plant standing there when the sniffles hit.