Euphorbia poissonii Pax
Euphorbia poissonii is an erect, much-branched, succulent shrub up to 6.6 feet (2 m) tall. The branches are cylindrical, succulent, up to 1.6 inches (4 cm) in diameter, green to silvery-grey on old trees, smooth, glabrous and full of white latex. They are topped with large green leaves during the growing season. The flowers are yellow-green or greenish with red stamens and up to 0.5 inch (1.3 cm) in diameter.
Photo via yeehua.net
USDA hardiness zones 10a to 11b: from 30 °F (−1.1 °C) to 50 °F (+10 °C).
Euphorbias are very easy to care for. These plants require a little pampering to become established, but once they are, they are self-sufficient. In fact, more die from too much care and watering than from neglect. Euphorbias need well-draining soil and lots of sunlight. They are not particular about soil pH, but they cannot tolerant wet soil. Unlike most succulents, Euphorbia does not handle long periods of drought well. It may need weekly watering during the summer. Water whenever the soil is dry several inches below the surface. Water deeply, but don't let them sit in wet soil, which can cause root rot. Add some organic matter or fertilizer to the planting hole. If you are growing them in containers or your soil is poor, feed with a half-strength fertilizer monthly.
These succulents can be grown from seed, but they can be difficult to germinate (or even find). They are usually propagated by cuttings. This can be tricky, because of the exuding sap. Rooting hormone is recommended with Euphorbias. They tend to grow problem free, but there are a few pests and diseases to be alert for… – See more at: How to Grow and Care for Euphorbia
Warning: When a plant get damaged it exudes a thick white milky sap known as latex. This latex is poisonous, contains some of the most potent irritants known. The latex is particularly dangerous for the eyes, skin and mucous membranes. So pay extreme attention not to get any in your eyes or mouth.
Euphorbia poissonii is native to northern Nigeria.
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Euphorbia poissonii is a decorative toxic succulent member of the large and varied spurge family of plants. It is an erect, much-branched, succulent shrub up to 2 m tall, with candelabra-form branching, with one to several columns and topped with large green leaves during the growing season, occasionally sub-spiny. The branches are cylindrical, succulent, up to 4 cm thick, green to silvery-grey on old trees, smooth, glabrous and full of white latex. The flowers are yellow/green or greenish with red stamens, up to 1.3 cm in diameter, bud trigonous, ornamented with 5 red glands.
When a plant gets damaged it exudes a thick white milky sap known as latex. This latex (resin) is poisonous contains some of the most potent irritants known. The latex is particularly dangerous for the eyes, skin and mucous membranes. So pay extreme attention not to get any in your eyes or mouth. Keep it away from children and pets.
Scientific Name: Euphorbia poissonii Pax
Synonyms: Euphorbia poissoni
It prefers full to partial sunlight. Provides good sunlight at least 3-5 hours of the day, and turn it regularly so that your plant doesn’t begin to grow lopsided.
It grows well in well-draining, gritty soil or cactus potting mix. They are not particular about soil pH, but they cannot tolerate wet soil.
You can allow the soil to dry out between each watering. Before watering the plant check underneath the pot through the drainage holes to see if the roots are dry. If so then add some water. Do not water too often to prevent overwatering, that can potentially kill it off.
It prefers an optimal temperatures of 60 degrees Fahrenheit – 85 degrees Fahrenheit / 16 degrees Celsius to 29 degrees Celsius.
Fertilize every two weeks with a diluted balanced liquid fertilizer during its growing season in the spring and summer. Avoid fertilizing your plant during the fall and winter months.
It can be easily propagated by cuttings. Take cutting in spring, which needs to be dried out for a couple of weeks in shade before potting. This can be tricky, because of the exuding sap. Rooting hormone is recommended with Euphorbias. Also can be propagated from seed, but they can be difficult to germinate.
Pests and Diseases:
Euphorbia poissonii may be susceptible to mealy bugs, scale insects, occasionally spider mites.
Euphorbia poissonii,  also known as Euphorbia poissoni  and, incorrectly as Euphorbia poisoni is a highly irritant and toxic succulent member of the large and varied spurge family of plants.  It is native to northern Nigeria, where local farmers extract its latex for use as a pesticide. Its powerfully irritant and pain-producing nature mandates use as a fencing plant.
It is named for French botanist Henri Louis Poisson, who formally described other Euphorbia species.
In addition to a variety of irritant phorbol-type esters, the latex contains resiniferatoxin and tinyatoxin, two closely related highly irritant resiniferonol-type esters.  The most active toxin, resiniferatoxin, binds to pain receptors in the same way as capsaicin but much more powerfully. It stimulates the neurons to fire repeatedly, causing pain.
Due to its selective nature of binding and killing pain receptors while leaving other nerve cells intact, resiniferatoxin is currently being researched as a possible treatment for chronic pain.