All About Oxalis Triangularis: Growing Tips and Care Guide

oxalis triangularis

Oxalis triangularis, or “purple shamrock” as it is often called, is a captivating and unique houseplant that’s sure to brighten any room. Its purple leaves feature a striking triangular shape, and when the light is just right, you’ll see its delicate yellow flowers.

Not only is Oxalis triangularis an attractive addition to any home, but it’s also easy to care for. Whether you’re a beginner or a seasoned green thumb, this plant will thrive in the right environment.

With its low-maintenance needs, Oxalis triangularis is the perfect choice for any indoor garden. In this care guide, you’ll learn all the essentials of growing and caring for Oxalis triangularis, from watering and temperature to light and soil. With a few simple tips, you’ll be able to enjoy this cheerful houseplant for years to come.

Where to Find Oxalis Triangularis

Oxalis triangularis, also known as “purple shamrock,” is a common houseplant that is easy to find in garden centers and local nurseries. It is a tropical plant, so it needs to be kept indoors during the winter. You can find Oxalis triangularis in a variety of sizes, including small pots and large hanging baskets.

If you choose to start with a small pot, keep in mind that Oxalis triangularis grows quickly, so you’ll have to repot it every year. Oxalis triangularis is also easy to propagate, so you can increase your supply by rooting cuttings.

Watering and Humidity Requirements

Oxalis triangularis requires a moderate amount of water and should be watered thoroughly but not regularly. To avoid over watering, water your plant when the soil surface has dried out and the plant appears wilted.

Oxalis triangularis does best with a humidity level of around 50-70%, which is easily achievable with a small humidifier or even a tray of water. Watering your plant with a little bit of fertilizer each time you water will give it a boost of extra nutrients.

Temperature Requirements

Oxalis triangularis thrives in normal room temperature and is cold sensitive, so avoid placing it near drafty areas. If you live in a colder climate, you can place your plant near a heat source, like a heater or fireplace, to keep it warm. If you notice your plant wilting, even after watering thoroughly, it may be a sign of low temperatures.

Light Requirements

Oxalis triangularis likes bright, but not direct, sunlight. This can be achieved by placing your plant near a window that gets a lot of sunlight but isn’t facing the sun directly. You can also supplement with artificial lights, but be cautious with the amount of light you give it since Oxalis triangularis is sensitive to too much light.

Soil Requirements

Oxalis triangularis does best in soil that’s rich in organic material and slightly moist. You can use a standard potting soil to houseplant, but you can also add some extra ingredients to make it more nutritious. You can add a little compost, manure, or even coffee grounds to boost the soil’s nutrients. Oxalis triangularis doesn’t require any special soil, but it does need a drainage hole in its pot to prevent root rot. If the pot doesn’t come with one, you can easily add one yourself.

Fertilizing Your Oxalis Triangularis

Oxalis triangularis needs very little fertilizer since it’s a low-growing plant. To determine how much fertilizer to use, you can follow the guidelines on the fertilizer container or use the “finger test.” The “finger test” is a quick and easy way to test the amount of fertilizer you should use. Simply take a pinch of your soil and squeeze it between your thumb and index finger; if it crumbles easily, it’s time to fertilize.

Common Pests and Diseases

Oxalis triangularis is prone to spider mite infestations during the fall and spring. Spider mites are small, eight-legged critters that suck the life out of your plant. You can identify spider mites by the fine webbing they leave behind. To prevent and treat spider mites, wash your plant regularly and use a targeted insecticide spray when pests appear.

Another common disease that can affect Oxalis triangularis is root rot. Root rot occurs when the soil is too wet or doesn’t have enough drainage. This can be prevented by adding an organic material to the bottom of the pot, like sand. If you notice signs of root rot, it’s best to repot the plant so that it can be placed in a soil with better drainage.

Common Signs of Unhealthy Oxalis Triangularis

If you notice any of these signs, it may be time to reevaluate the care you’re giving your plant. Check the soil for signs of over or underwatering. Look for wilted or discolored leaves that may indicate a pest or disease. If your plant is in a drafty area, you may notice it beginning to wilt. If you notice any of these signs, take a moment to reevaluate your care and try to correct the problem as soon as possible.

Propagation and Repotting

Oxalis triangularis is easy to propagate by rooting cuttings. Simply remove a 4” piece of the parent plant, Trim off the lower leaves, and place the piece in a jar of water until the roots sprout. Once the roots are long enough, place the new plant in moist soil and place it in indirect sunlight. You can also repot your Oxalis triangularis every year.

When repotting your Oxalis triangularis, you can either transfer it to a larger pot or use the same pot but add more soil. You can also add a slow-release fertilizer to give it a boost. Oxalis triangularis prefers a rich soil that has been allowed to partially dry out between waterings. The best time to repot your Oxalis triangularis is early spring before it starts to grow.


Oxalis triangularis, or purple shamrock, is a striking houseplant that is easy to care for. It has low-maintenance needs and thrives in normal room temperature and bright, but not direct, sunlight. To keep your plant happy and healthy, follow these tips when it comes to watering, light, soil, and fertilizing.

If you notice any signs of poor health, take corrective action as soon as possible to keep your plant thriving. With a little bit of TLC, Oxalis triangularis is sure to brighten any indoor space.


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