Black Eyed Susan CareProblems When cultivation Black Eyed SusanFrequently request Questions

Black eyed susan or brown-eyed susan, coneflower or Gloriosa daisy. This names explain the Rudbeckia types of plants. This family member of the sunflower grow both wild and in garden settings, and it’s a beautiful enhancement to your yard!

But what yes, really is the difference between a black-eyed susan or a browneyed one? Is a coneflower any kind of different? are there pests or conditions which just strike rudbeckia, and also if so, just how do you resolve those?

There’s tons of concerns to answer around these stunning flowers, for this reason let’s dive in and also explore all there is to know about the black color eyed susan and its nearby cousins!

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Black-Eyed Susan Overview

An unusual cultivar of Rudbeckia hirta. Source: Mollivan Jon
Common Name(s)Black eyed susan, black-eyed susan, blackeyed susan, brown-eyed susan, brown betty, Gloriosa daisy, gold Jerusalem, English bull’s-eye, poor-land daisy, yellow daisy, yellow ox-eye daisy, Rudbeckia Goldsturm, orange coneflower, perennial coneflower, Goldsturm black-eyed susan, California coneflower, browneyed susan, brown eyed susan, thin-leaved coneflower, three-leaved coneflower, and more
Scientific NameRudbeckia hirta, Rudbeckia fulgida, Rudbeckia californica, Rudbeckia triloba, and also more
OriginUnited States
Height1-3 meters
LightFull sun
WaterMedium/moderate watering
TemperatureWarmer temperature (60 levels F and also up)
HumidityDrought-tolerant however can manage humidity together well
SoilWell-draining, organic matter rich
FertilizerNone required, irradiate slow-release fertilizer okay, compost okay
PropagationBy division, cuttings, or seeds
PestsAphids and also cabbage worms. Likewise draws butterflies, may draw other advantageous insects. Prone to powdery mildew, downy mildew, sheet spot diseases such together Septoria sheet spot, and verticillium wilt.

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Types of black color Eyed Susans

There’s many types of Rudbeckia species, although only a few qualify together “black eyed susans”. These four varieties are a an excellent place to start, as they cover most of the usual garden varieties as well together regularly-seen wildflower varieties.

Rudbeckia hirta, ‘Black-Eyed Susan’, ‘Brown-Eyed Susan’, ‘Brown Betty’, ‘Gloriosa Daisy’, ‘Golden Jerusalem’, ‘English Bull’s-Eye’, ‘Poor-Land Daisy’, ‘Yellow Daisy’, ‘Yellow Ox-Eye Daisy’

Source: Laubegaster Ufer

This is the Maryland state flower. Rudbeckia hirta is likewise the most often Rudbeckia referred to as black eyed susan. There are numerous black eyed susan varieties and also cultivars that this certain species. Several of these are Rudbeckia hirta var. Angustifolia, as well as var. Floridiana and var. Pulcherrima.It grows across the joined States and into Canada.

This vivid yellow-petaled flower can be one annual, biennial or perennial depending on the cultivar. The flower can reach size of up to four inches across with long, slim yellow petals prolonging outward indigenous a brown or black dome-shaped cone center. That leaves are generally about the basic of the plant and appear hairy, v thick stems holding the blooms aloft over them. Some cultivars have actually been arisen which have actually reddish, orangish, or brownish shades to the flowers together well.

Rudbeckia fulgida, ‘Rudbeckia Goldsturm’, ‘Orange Coneflower’, ‘Perennial Coneflower’, ‘Goldsturm Black-Eyed Susan’

Source: M. Boy name Vicente

One the the ideal Rudbeckia ranges for many gardeners is Rudbeckia fulgida. With 7 cultivars, 2 of which have received the imperial Horticultural Society’s compensation of garden merit, Rudbeckia Goldsturm is very popular. Both the stems and also leaves that this plant are hairy, and the leaves space lancelike. End the leaves prolong tall trunk atop which room gold-petaled flowers through a pronounced central cone.

Rudbeckia californica, ‘California Coneflower’

Source: Tim Berger

Native in north California, wherein it regularly grows in the meadows or river bottoms around the Sierra Nevada and also Klamath areas, the California coneflower is usually located in moist environments.

It is most generally seen together a perennial wildflower. Its stems average around a meter in height, yet can grow as tall as 2 meters. The brown facility of the flower is conical come cylindrical in shape, surrounding by plenty of bright yellow petals.

Rudbeckia triloba, ‘Browneyed Susan’, ‘Brown-Eyed Susan’, ‘Brown Eyed Susan’, ‘Thin-Leaved Coneflower’, ‘Three-Leaved Coneflower’

Source: Carl E Lewis

While it’s periodically grown in gardens, Rudbeckia triloba is more commonly checked out in fields or follow me roadsides. These generally have a an ext expansive mat of smaller sized flowers than other Rudbeckias. The leaves prosper in triads, providing it that is three-leaved name, and the center of the flower is typically a brief dome-shape the dark brown fairly than nearly-black like other related species.

Black Eyed Susan Care

One of the best things about growing black color eyed susan is that it’s exceptionally easy to grow… sometimes even too easy, especially if it’s one of the varieties that regularly grows in the wild. Let’s walk over part tips for no only farming this plant, yet for keeping it and keeping it from dispersing out of your planned environment!


Most black eyed susans like a full sun environment, although some varieties can likewise do well in partial shade. Plan for complete sun at any time you deserve to for this plant, however, together it often tends to flower much better in complete sun environments. It can handle the heat.


While black-eyed susan can take some drought conditions, it yes, really prefers continuous watering. After ~ all, the grows regularly along locations that trap water (river bottoms, the political parties of roads, meadows, etc). Yet it doesn’t choose standing water, so be sure your soil drains well!


Well-draining yet moist floor that has lots that organic matter is right for cultivation Rudbeckia. When it deserve to tolerate many different soil varieties from clay to sandy and everything in between, the plant likes its roots to be able to breathe fine while still having ready access to water. Black color eyed susans like a neutral pH soil.


For best black eyed susan care, girlfriend don’t desire to overfertilize your soil. Overfertilization reasons the flower stems to droop or come to be weak. If you’re going to fertilize at all, usage a general-purpose slow-release granular fertilizer sparingly once or double a year. Alternately, simply amend the soil about the plants with some affluent compost. Many of the wilder species of rudbeckia don’t actually require fertilizer in ~ all, yet they perform like extra organic matter in their soil.

Propagating black color Eyed Susan by Division

Black-eyed susan has actually the propensity to spread, and can crowd out other plants. This happens due to the fact that they have actually a creeping and also dense root mechanism that becomes extensive under the soil’s surface. You’ll need to divide your perennial plants consistently to store them indigenous overcrowding. This deserve to be excellent in the spring before new growth forms, or in the autumn after the plant has actually finished flowering for the year.

To divide black eyed susan, very closely scoop the end the soil roughly the basic of the plant, creating how broad the source mass is and clearing sufficient room to eliminate it every at once. Friend will must dig 6-10 inches the end from the base of the plant on every sides. On slide a trowel or shovel in under the root mass, being cautious not to reduced the roots, and lever it the end from the soil.

Once eliminated from the ground, shower or dust turn off excess soil the is clinging to the roots. Use your fingers to gently tease personal the root mass. If you have to cut any roots, sterilize a knife in a systems of one part bleach to nine parts water, and then use that because that cutting. For replanting, you desire to have actually clumps the 3-5 tuberous roots v each clump having both thick tubers and smaller roots. If you’re merely reducing the size of her existing tree so castle don’t crowd out their neighbors, you have the right to do that together well.

You’ll must divide your perennial plants every 3-5 year to store them from coming to be overcrowded.

Propagating black color Eyed Susan through Cuttings

While it’s possible to propagate by cuttings, black color eyed susan has tendency to it is in a little less reliable than some other plants. Still, if you desire to keep the same precise plant form as the initial (as seeds can cause slight variations), this is the best method to perform it!

Pick healthy stems to take her cuttings from. The cutting must be at least 6 inches long with numerous leaves, and also you should reduced it at an angle. As soon as you have actually made her cut, remove most of the leaves. You want to leave the top three leaves intact. Dip the cut end into a rooting hormone and also place right into your farming medium of choice (I recommend perlite or a sterile potting mix).

You must keep the humidity up roughly your cuttings to encourage rooting, and it have the right to take a while. You have the right to place a plastic bag about your cut to aid keep the humidity up. Alternately, I’ve acquired a advantageous guide come cuttings that consists of some other choices that might aid with getting them to take root.

Propagating black Eyed Susan through Sowing Seed

If you’re planting seed in the spring, be certain your floor temperature has actually reached at the very least 70 degrees Fahrenheit to market the best chance for seed germination. These plants will generally grow between 1-3 feet tall and can spread out 12-18 inches. If you want to encourage a tighter and an ext compact expansion pattern, you have the right to sow her seed closer together to store the plants from dispersing out. If you desire to encourage a border row, you deserve to spread her seed throughout a broader space.

Gently sprinkle the seeds across your all set soil’s surface. When you’ve inserted your seed, loosely cover through soil and water gently, being mindful not to to wash the spanning soil away.

If you desire to collect seed from her rudbeckia plants because that future reseeding, girlfriend can! her plants must be over a year old to produce viable seed. As the blooms dry back, you can place a record bag end the top of the black eyed susan flower and shake the particle head into the bag, releasing few of the seeds. Permit it to extensively dry on a tray in a low-humidity area and also store it for future sowing.

Source: BlueRidgeKitties


If you’ve be separated out part root clusters, you deserve to repot these rather easily. For sure you have actually a good well-draining, essential matter-rich potting soil. Place the root cluster right into the floor at the same height as the original plant was buried to, and also gently to fill in under and around the source mass with more potting soil. Be certain that you have actually a bigger pot 보다 you for sure need, since the black eyed susan will infect fill her container.


To encourage an ext flower growth and to prevent automatic reseeding, it’s essential to deadhead spent blossoms. If you have actually a committed bed for simply those plants, girlfriend can permit them to reseed in the bed, however other plants and younger black color eyed susans may gain crowded out.

Most black color eyed susan arrays bloom from June through September. During that duration of time, you might often discover yourself deadheading to keep the plants blooming brightly. However, girlfriend can likewise prune the stems ago after they have finished flowering to shot to encourage another flush of flower in the late fall.

Problems When growing Black Eyed Susan

While there are very few growing troubles with black color eyed susan (other 보다 the tree perhaps cultivation too huge and needing to be divided), there are some pests and diseases to be ready for.


The two major pests that prey upon black color eyed susans room aphids and also the cabbage worm. They’re additionally a plant the draws butterflies, which is generally an excellent as it adds one more pollinator to your garden.

With aphids, you have the right to offer a level of prevention by spraying neem oil on all plant surfaces, which will deter the aphids. This’ll also aid prevent the egg of cabbage worms indigenous hatching. However, if you discover you need something a little stronger, consider a pyrethrin spray such as much safer Brand house & Garden Spray. Pyrethrins space effective versus both aphids and also cabbage worms.

Be mindful when you spray, due to the fact that butterflies may likewise be susceptible to pyrethrins. It’s best to spray in the so late afternoon or early evening, together cabbage moths become energetic at night and also aphids space at rest at the time. That provides the pyrethrins time to dried on the plant before butterflies become active again.

Some black eyed susans are also attractive to large livestock or wild animals such as deer. However, they have a bitter flavor, and that can frequently drive all however the hungriest animals away.


Mildews have the right to be a far-reaching problem come rudbeckia. Black color eyed susan is vulnerable to a variety of plant diseases, many of i beg your pardon come native watering end the height of the plant or overly-wet soil.

For powdery mildew, remove and also destroy the impacted parts that the plant, and then spray all plant surfaces thoroughly with neem oil to prevent more spread. If many of the tree is mildewed, you have the right to spray neem oil every couple of days to try to wipe out the mildew, but this might or may not it is in effective.

Downy mildew is a tiny harder come eradicate. It often requires the application of a fungicidal agent such together liquid copper fungicide. A good choice is Bonide Copper Fungicide. However, the fluid copper fungicide will treat powdery mildew as well as some leaf spot diseases and also downy mildew, so it’s a good product to have on hand.

Black eyed susan is also susceptible come leaf point out diseases. While the liquid copper fungicide mentioned over will aid with few of the sheet spot issues, it doesn’t work on the most damaging sheet spot for its species. TheSeptoria leaf spot is caused by the plant virus Septoria rudbeckiae, and it reasons dark, virtually black spotting come the leaves of her plant. To combat this particular leaf spot, you’ll need a fungicide that includes the active ingredientchlorothalonil, such together Bonide Fung-Onil fungicide.

Finally, rudbeckia is susceptible to verticillium wilt. This fungal virus is soil-borne, and also there is no cure for this disease. Destroy any kind of plants affected, and look into a fungicidal soil treatment to get rid of the virus before planting in that area again.

Frequently inquiry Questions

Q: Is it for sure to prosper black eyed susans approximately kids and pets?

A: It’s advisable to save dogs, cats, and small children the end of the black-eyed susan patch! While that shouldn’t be fatal, the can reason gastrointestinal upset, resulting in stomach upset, diarrhea, and possibly nausea or vomiting if eaten. If her pets or youngsters are likely to shot to eat the flowers or pipeline of your plants, this probably isn’t a good choice for your garden.

If you doubt your pet or child has eaten some of your Rudbeckia, take it them to the doctor or the vet to be sure they’re okay. If necessary, the doctor/vet have the right to induce vomiting prior to it i do not care a major problem.

Rudbeckia plants often tend to taste awful, which is a little of a deterrent for most animals and also definitely for kids!

Q: space there other uses for black-eyed susan?

A: indigenous Americans supplied Rudbeckia hirta commonly for medicine purposes. The root are provided like echinacea, an enhancing immunity to colds and the flu. As an infusion, it deserve to be an astringent to wash for swelling or open sores. It’s additionally been used to treat line bite injuries, and can be offered as a diuretic. As with any type of medicine, it’s best to talk v your physician or trained herbalist before trying come use natural medicines, to avoid you indigenous potential an unfavorable interactions with various other medications and also from bad side effects.

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Q: Is black color eyed susan yearly or perennial?

A: There’s annual, biennial, and also short-lived perennial black eyed susan varieties. Relying on which that the Rudbeckia varieties you opt come grow, several of the commonly biennial types can it is in coaxed out right into perennials v the appropriate rudbeckia care. However, perennial varieties do not last for decades, having a relatively short median lifespan of five to 7 years.

With every one of these hints, you should be set to prosper black eyed susans in your own yard. What’s your favorite Rudbeckia cultivar? have actually you get an impressive multiple varieties, and also if so, i beg your pardon ones? allow us recognize in the comment below!