Tag outdoor plants

The African Milk Tree

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Euphorbia trigona, also known as the African Milk Tree, is a striking succulent often mistaken for a cactus, though it actually belongs to the spurge family (Euphorbiaceae). It’s popular as a houseplant because of its sculptural shape and relatively easy care.

🌍 Origins

Euphorbia trigona is native to central and western Africa, particularly regions like Cameroon. In its natural habitat, it grows in warm, semi-arid environments with plenty of sunlight. It has long been cultivated both locally and globally, so its exact wild origin range is a bit blurred by human propagation.

🌿 Appearance

This plant has a very distinctive look:

  • Growth form: Upright, columnar stems that branch upward, giving it a candelabra-like shape
  • Stems: Triangular (hence trigona), with ridges lined by small paired spines
  • Leaves: Small, oval leaves grow along the ridges; they’re usually green but can be reddish in some varieties
  • Color varieties:
    • Standard green
    • “Rubra” or “Royal Red” form with reddish stems and leaves

Although it resembles a cactus, it differs in structure and produces a milky white sap (latex), which is typical of spurges and can be irritating or toxic if handled improperly.

📏 How Tall Can It Get?

Height depends heavily on where it’s grown:

  • Indoors: Typically reaches 4–6 feet (1.2–1.8 m), though with time and good conditions it can grow taller
  • Outdoors (warm climates): Can reach 10–15 feet (3–4.5 m) or more, forming a large shrub-like structure

It grows relatively fast compared to many succulents, especially with bright light and consistent care. When I bought my Euphorbia trigona in 2021, it was about 18 inches tall. One spring, it shot up about 2 feet, which I never expected. About a year and a half ago, a close friend and I decided to move it from my second-floor balcony to the side yard on the first floor. My reasoning was that it was almost 6 feet tall, and would be almost impossible to move from the balcony if it got much larger. As you can see in the photo, it is now 7-1/2 feet tall!

Easy Care Rat Tail Cactus

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The first rat tail cactus I ever bought. This has been on my balcony for 6 years and finally bloomed this year.

The rat tail cactus—scientifically known as Aporocactus flagelliformis—is a striking, easygoing cactus that stands out because it doesn’t look like the typical upright desert plant. It’s actually a trailing, almost vine-like cactus that’s popular as a hanging plant. I have had two specimens for a number of years, and one in particular has been quite full and happy. When they both decided to bloom recently, I became a big fan of them and added two more to my balcony collection.

🌵 Appearance

Rat tail cactus has long, slender stems that can grow several feet in length. These stems:

  • Are cylindrical and about ½–1 inch thick
  • Covered in fine, soft-looking spines (not as intimidating as many cacti)
  • Usually a medium to bright green color

As the plant matures, the stems spill downward, giving it that “rat tail” look—hence the name. It’s often grown in hanging baskets so the stems can cascade freely.

🌱 Growth Habit

Unlike many desert cacti, this one is naturally epiphytic or lithophytic, meaning it can grow:

  • On rocks
  • In crevices
  • Or even on trees in its native habitat (mainly Mexico)

Instead of growing upright, it:

  • Trails and drapes over containers
  • Produces lots of branching stems over time
  • Can become quite full and dramatic with age

It’s fast-growing compared to many cacti, especially during the warmer months.

This is the second rat tail cactus, in bloom

🌸 Blooms

When the rat tail cactus blooms, it really steals the show.

  • Flowers are bright pink to reddish-magenta
  • About 2–3 inches long
  • Tubular in shape, with layered petals that flare outward
  • Often appear along the sides of mature stems

Blooming typically happens in spring to early summer. A healthy, mature plant can produce many flowers at once, creating a vibrant cascade of color against the green stems. The blooms don’t last forever individually, but the plant may produce them in succession.

☀️ Care Guide

Light

  • Prefers bright, indirect light
  • Can tolerate some direct sun, especially morning sun
  • Too much harsh afternoon sun can scorch the stems

Water

  • Water when the top inch or two of soil dries out
  • During growing season (spring/summer): water regularly but don’t let it sit in water
  • In winter: reduce watering significantly

Overwatering is the most common mistake—this cactus still needs good drainage.

Soil

  • Use a well-draining cactus or succulent mix
  • Adding perlite or sand improves drainage

Temperature

  • Thrives in warm conditions (65–80°F / 18–27°C)
  • Can tolerate slightly cooler temps in winter, but protect from frost

Humidity

  • Unlike desert cacti, it appreciates moderate humidity
  • Good airflow is still important

Fertilizer

  • Feed with a diluted cactus fertilizer during spring and summer (about once a month)
  • Avoid feeding in fall/winter

Potting & Placement

  • Best grown in hanging baskets to show off trailing stems
  • Repot only when necessary—slightly root-bound is fine

🌿 Bonus Tips

  • To encourage blooming, give it a cooler, drier rest period in winter
  • You can propagate it easily from stem cuttings
  • If stems get too long or messy, they can be trimmed without harming the plant

Overall, the rat tail cactus is a great choice if you want something low-maintenance but visually dramatic—especially when those vivid pink flowers show up.