All varieties of Hoya plants are also referred to as wax plants and porcelain flowers. They are native to Malaysia, Thailand, and the Philippines. They are epiphytic, or air plants, meaning that they grow on another plant or object to support themselves.
They are fairly small and compact, growing to about 12 inches wide and 2-3 inches tall when fully mature.
What does Hoya Curtisii need to grow?
The optimal position in the home for a Hoya Curtisii plant is right next to a window. They thrive with access to bright and indirect light but also benefit from a few hours per day of direct sunlight.
Windows that face east or west are the ideal situations for Hoya Curtisii plants to be located. Southern windows are also good but can cause the soil of your plant to dry out even faster.
When Hoya Curtisii plants are receiving sufficient direct sunlight they will flower. These flowers will appear in clusters of green, yellow, or red.
The original climate Hoya Curtisii plants come from is warm. They cannot tolerate temperatures that dip below about 50 degrees Fahrenheit.
The ideal temperature range for these plants is between 65 and 75 degrees Fahrenheit during the day and around 60 degrees Fahrenheit during the night.
Due to their country of origin, Hoya Curtisii plants like a humid environment. They can grow in areas with a lower humidity, but this is not optimal.
Where possible, try to keep the humidity levels around or above 50%. You can use a humidity tray or humidifier to achieve this if you live in a drier climate. You can also mist the leaves of your Hoya Curtisii plant regularly with water from a spray bottle.
The soil for Hoya Curtisii plants must be very well-draining. We recommend a 2:1 mix of succulent or cactus soil with perlite or ¼ inch pumice.
You should ensure that your mixture is fully mixed before planting your Hoya curtisii.
Hoya curtisii plants are fairly drought-resistant and do not require too much watering. When watering you should fully soak the soil, allowing any excess to drain out of the bottom. It is absolutely essential that your plant pot has adequate drainage holes to prevent overwatering.
Between waterings, you should allow the soil to dry out. Dip your finger into the top inch or two of soil to check the moisture level. The soil should be completely dry before you water your plant again.
The growing season for Hoya Curtisii is between the spring and summer months. At this time of year, you should be using a houseplant fertilizer to supplement their nutritional intake at least once per month.
In the more dormant periods, you should only give it fertilizer once or twice. This is because the plants have a much lower energy demand and do not need supplementation. A good fertilizer ratio is ¼ teaspoon powdered fertilizer per gallon of water.
How to propagate Hoya Curtisii
In order to propagate Hoya Curtisii, you will need to take a stem cutting. This process is best done in the spring and summer months, during the growing period.
Cut a stem below the node where the air roots are growing. This will be very easy to spot. When cutting, you should use sharp and sterilized blades. This minimizes the unnecessary damage done to the mother plant. Sterilizing the blades means that the risk of harmful bacteria and fungi being introduced to your plant is minimized.
The cutting should have a node, at least 2 leaves, and appears healthy. Try to take cuttings that are not longer than 6 inches. Cuttings this long are much less likely to root.
Place the cutting into a clear container with water coming 1-2 inches up the base of the cutting using the water propagation method. Use orchid clips to hold the cutting just above the base of the container, to allow space for the roots to form.
Alternatively, you can use wet moss to propagate your cutting. Soak moss in water and place it into a jar. Gently place your cuttings on top of this, ensuring you do not damage them.
Once the roots are about an inch long, transfer the cutting into a plant pot filled with moist soil. As a general rule, this should take about 2 months.
Propagation by layering
This method of propagation means that the new growth from the cutting remains attached to the mother plant until it has grown new roots.
Grab one of the stems and fine the node. Pin it into the soil near the mother plant. If you wish to increase the moisture content of the soil for the new cutting, you can place a plastic bag over the cutting.
Allow the roots to grow for 2 to 3 months. After this time, you can use a sharp and sterilized blade to cut the new plant away from the mother. Repot it into its own plant pot containing a mixture of 2 parts soil and 1 part perlite.
It should take about 2 years for the plant to grow to its full size.
Do you need to prune Hoya Curtisii?
Not really. You can prune off leaves that appear unhealthy or that are dying. This will help to maintain the shape and appearance of your plant.
Repotting Hoya Curtisii
Hoya curtisii plants will not need repotting as often as most other plants will. They actually prefer to be pot-bound and cope better in smaller pots.
They will eventually need repotting, but it is vital that you only increase by one pot size when you do this. For instance, if your Hoya Curtisii was originally in a 4-inch pot, you should re-pot it into a 6-inch pot.
Overpotting can cause problems for Hoya Curtisii plants. This is because there will be more soil, meaning that the soil will take much longer to dry out. This could potentially lead to root rot.
Read about these other popular Hoya varieties:
Care Instructions For Hoya Australis That Are Effective
Hoya Krimson Princess Majestic Care Tips
Hoya Krimson Queen – Royal Plant Care Complete Guide
Hoya Pubicalyx The Porcelain Flower Plant
Hoya Carnosa Compacta Care Tips You Wish You Knew Earlier
Common issues with Hoya Curtisii
If your Hoya Curtisii is growing but the leaves are falling off before they appear mature, it is likely an indicator of a hydration issue. This could be caused by over or underwatering. Take an assessment of your watering schedule and try to keep it as regular as possible.
During their growing period and when they are blooming, Hoya Curtisii plants have a much higher water demand.
This is generally due to the plant undergoing stress during the time of leaf production. This could be too high a temperature, overwatering, or an environmental change.
Provided that you keep the environment the same, the rest of the leaves should be more regular in appearance.
Hoya curtisii plants are susceptible to thrips, mealybugs, scale, and spider mites. To fix most of these infestations, you can run some water over the plant or spray it with a houseplant insecticide.
Slow or no growth
This could simply be due to an environmental change, such as bringing your plant home from the store. This journey could send your plant into a state of dormancy where the growth could be halted for months at a time.
Allow it time to adjust to its new environment. If after a few months you still have not seen any growth, consult a plant expert.
Thin or wrinkly leaves
This is a symptom of stress. Look at the drainage system for your plant and ensure the soil is not too compacted. If the soil is dry, the plant is likely just thirsty and a good drink will fix it.
If the soil is wet, this could imply that the plant’s roots are rotting. Carefully pull it out of the plant pot and inspect the root systems to ensure they are healthy.
If you see the tip of the vines shrivel, this indicates that the vine is dead. You can cut this off without worrying. Just take care to ensure you are not cutting off a peduncle, as this is where the flowers appear from.
This is an indication that you have been overwatering your plant. You should check the base of your plant pot to ensure there are enough drainage holes.
You should always allow the soil to dry out between watering. If it takes too long to do this, you could consider repotting the plant into a faster draining soil.