Hoya praetorii

Hoya Praetorii

The Hoya praetorii is a unique hoya native to southern Thailand, Malaysia and Borneo. It is an evergreen hoya with some of the most unusual blooms amongst hoyas. The leaves of this plant are a dark green prominent veins and a few splashes of lighter color. 

The blooms are very attractive, with bright orange reflexed corollas and lighter orange coronas.


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Scientific name: Hoya praetorii

Common names: Wax plant, porcelain flower, waxvine

Origin: Thailand, Malaysia and Borneo.

Flower colour: Bright orange corollas with light orange coronas

Genus: Hoya

Family: Apocynaceae (Asclepiadaceae)

Kingdom: Plantae

Type:Flowering vine

How to care for

Hoya praetorii

Rarer hoyas like the Hoya praetorii are not as easy going as other hoyas. While the care requirements may often be the same, these hoyas are exacting in their demands and respond to the slightest change in temperature, watering, or humidity levels.


  • Bright indirect light 
  • Temperature range 40-50 degree F
  • Humidity range 40%-65%
  • Well-draining coarse soil 
  • Less watering
  • Fertilizing with organic fertilizer during the growing season.

Hoya praetorii Detail

Light Requirements:

  • Hoya praetorii does best in filtered sunlight. Because "dappled shade" typically refers to light that is filtered through trees, recreating this effect inside is more challenging.
  • Light levels as low as those found indoors or in medium, indirect light will be fine for Hoya praetorii. 
  • It functions well in fluorescent lighting, which you can use if you do not get adequate natural light.

Temperature Requirements:

  • Hoya praetorii is one of those hoyas that thrive best in an average temperature range, between 40-50 degrees F. 
  • During the colder months, it is recommended to place your hoya on a heating pad and use warm lights. This hoya responds very quickly to changes in temperature. 
  • Place your hoya where there are no sudden drops in temperatures or circulating cold drafts. It starts to drop leaves quickly if so.

Humidity Requirements:

  • The Hoya praetorii prefers moderate to high humidity, which can be anywhere between 60% and 80%.
  • Maintaining the proper humidity level is crucial for the Krohniana since they cannot survive for long in environments with humidity levels that are below ideal. Use of a humidifier, which will assist in maintaining the desired humidity, is one method.
  • If you have them indoors, misting and sponging are advised during the winter. However, avoid keeping the leaves drenched in water because that promotes root and leaf rot.

Watering Requirements:

  • Hoya praetorii cannot flourish without sufficient humidity. In order to raise the relative humidity in a space with houseplants, a humidifier is a simple and effective solution.
  • The ideal range is between 40 and 60%. Put a gravel-filled drainage tray under the container to achieve this. Be careful not to fill the pot all the way to the top with water. Keep it close to your hoya to increase humidity.
  • Use a humidifier to keep the air humidity where it should be, between 30 and 50 percent.

Soil Requirements:

  • Hoya praetorii thrives in organically rich, well-drained soils.
  • Hoyas require very specific potting soil conditions to thrive. Commercial blends that are too generic tend to retain too much water, leading to root rot.
  • However, it requires adequate water to prevent leaf drop. Finding that balance can be tricky, but the following are some possible approaches:
  • This plant should thrive in a soilless mixture of equal parts perlite, bark, and indoor plant potting mix, or just lots of perlites.
  • Or Combining equal parts of sand, perlite, and orchid potting mix yields the desired result.

Fertilizing Requirements:

  • Hoya praetorii only needs a little fertiliser. 
  • Fertilize once a month during the growing season with a general houseplant fertiliser diluted to half strength (spring and summer).
  • Do not fertilize in the fall or winter, when the plant is dormant. When your plant is in this state, growth is either slow or nonexistent. If you over-fertilize, your plant will suffer.
  • Overfertilization can cause salt buildup, which manifests as a white crust on the soil's surface. In this case, water your plant with room temperature water.


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