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Clog Plant, Guppy Plant, Goldfish Plant 'Black Magic'

Nematanthus gregarius

Family: Gesneriaceae (ges-ner-ee-AY-see-ee) (Info)
Genus: Nematanthus (nee-ma-TAN-thus) (Info)
Species: gregarius (greh-GAR-ee-us) (Info)
Cultivar: Black Magic
Additional cultivar information:(aka Cheerio)
Synonym:Nematanthus radicans
Synonym:Hypocyrta radicans


Tropicals and Tender Perennials

Foliage Color:

Unknown - Tell us

Bloom Characteristics:

Unknown - Tell us

Water Requirements:

Average Water Needs; Water regularly; do not overwater

Where to Grow:

This plant is suitable for growing indoors


6-12 in. (15-30 cm)


36-48 in. (90-120 cm)


USDA Zone 10b: to 1.7 C (35 F)

USDA Zone 11: above 4.5 C (40 F)

Sun Exposure:

Light Shade


Handling plant may cause skin irritation or allergic reaction

Bloom Color:


Bloom Time:

Late Spring/Early Summer

Mid Summer

Late Summer/Early Fall





Other details:

Unknown - Tell us

Soil pH requirements:

6.1 to 6.5 (mildly acidic)

6.6 to 7.5 (neutral)

7.6 to 7.8 (mildly alkaline)

Patent Information:


Propagation Methods:

From softwood cuttings

By tip layering

Seed Collecting:

N/A: plant does not set seed, flowers are sterile, or plants will not come true from seed


This plant has been said to grow in the following regions:


Springville, Alabama

Hayward, California

San Jose, California

San Pedro, California

Wheatland, California

Smyrna, Delaware

Clearwater, Florida

Oldsmar, Florida

Belle Rose, Louisiana

Lafayette, Louisiana

Westland, Michigan

Howell, New Jersey

Alamogordo, New Mexico

Deposit, New York

Elizabeth City, North Carolina

Akron, Ohio

Okeene, Oklahoma

West Warwick, Rhode Island

Missouri City, Texas

Weslaco, Texas

show all

Gardeners' Notes:


On Jun 29, 2016, BayAreaTropics from Hayward, CA wrote:

In the SF bay area they can bloom nearly all year. But try to buy one in bloom. Some cultivars of this plant are poor bloomers...sometimes never bloom.
Lots of filtered sun,water and occasional feeding. Hummingbirds love them.


On Apr 21, 2015, rvranch from Willcox, AZ (Zone 8a) wrote:

Love this plant! It is gorgeous in bloom or out. The shiny, dark green leaves grow close enough to make every stem full and never leggy. Mine is in a NW facing window and always looks great. I let it dry a bit between waterings and it does just fine. I've had mine for two years and this is the first year its flowered. As I had never seen it in bloom, the bright orange little "fish" were quite a surprise.

I bought it at the closeout stand in Home Depot for five dollars. I was taken with the shiny leaves but knew little about it. My variety is called 'Black Gold'. I'm thinking of starting some cuttings after it is finished blooming.


On Jun 30, 2009, carpathiangirl from Akron, OH (Zone 5a) wrote:

Vigorous grower and nice bloomer even with little or no fertilizer and thrives on neglect. But it like no hugs because it's leaves are rather delicate and break off easily so be careful when moving it.


On Apr 27, 2008, orchid_rookie from East Northport, NY wrote:

This plant looks like my first goldfish plant! It seems to love a sunny window (at least in New York), and it responds well to occasional pruning. Mine blooms most of the time, and when it doesn't, it is a pretty foliage plant. I feed it African Violet food from time to time and am careful not to overwater it. Believe it or not, only twice a month!

P.S. I now have three goldfish plants -- one from cuttings, one purchased yesterday. I love this plant!


On Apr 20, 2007, gardenbugde from Smyrna, DE (Zone 7a) wrote:

I purchased a small plant in the Spring of 2004. I had wanted one for years and was excited when I found one at a local nursery in bloom! I was in a southwestern facing window for awhile where it got light but wasn't getting "cooked". I moved it into a bigger pot and into a different spot where it got filtered light. About 6 months ago, I moved it to an Eastern exposure window and it's very happy there. It didn't bloom again until just a couple weeks ago. It's gotten very long and is covered with buds!
This is a very easy plant to care for... I don't ever have to fuss with it and it gets plant food (from March 1 to November 1) everytime I water it. It loves the eastern exposure and that's where it's going to stay. It roots fairly easily in soil with the help of rooting hormone. It w... read more


On May 7, 2005, blckwolf256 from Springville, AL (Zone 7a) wrote:

I just bought one at Lowe's yesterday for $7.95. I have been watching a seller on ebay who has been listing them for several months. I just could not bring myself to bid $9.99, then pay for the S& I was thrilled when I found it yesterday!!
Wish me luck with my new Goldfishes!!


On Jan 19, 2005, LouElla from Selah, WA wrote:

Retiree from Selah Washington .

A friend of mine has this plant growing in the east window of her kitchen on the windowsill. I have another friend who has a start off this plant growing in a northern exposure window. I have just aquired a piece of this plant and hope to get it to root. I have placed it in a "seed start/peatmoss" starting soil.


On Sep 28, 2004, tracey2 from Watertown, NY wrote:

I live upstate NY and a local supermarket was selling this absolutely beautiful/unique plant. My friend purchased one - we loved the flowers - but it shed leaves (handsful at a time) and flowers dropped off, so she didn't want it any more. I have a large variety of 'easy to care for' houseplants, so I offered to take it off her hands. There was no 'potting tag' and I'm not sure how to care for it. The leaves are dark green and glossy. Plant appears to be very healthy, but several leaves will drop off at once - dark, healthy leaves, not brown.


On Mar 31, 2004, captainswife from Rosemount, MN wrote:

I bought this plant in the fall because of the orange flowers. It has done so well in a southeast window (indirect light) and has steadily bloomed all winter long with just brief dormant periods. I feed every two months with flowering houseplant spikes and allow to dry before watering.


On Feb 23, 2004, Umbrial from West Warwick, RI wrote:

I rescued two of these plants (half dead) from behind a pizzaria, not knowing what they were. I however was certain I could revive them from their stressed state. Years later, after being surprised by many yellow flowerings and vibrant trailing growth, I was still unable to identify the plant. Finaly an expert at a plant shop identified it as some type of goldfish plant (today btw), though he could not narrow down the exact type. I am overjoyed to see your picture and the end of an four year mystery. I look forward to collecting more types of the species. Thank you. -Ursula