In general hoya carnosas can be grown in most households as long as you pay them a little bit of attention, they like bright light, humidity and a really well draining growing medium…
Hoya Carnosa Care Summary
|Light needs:||Indirect sunlight is best.|
|Watering needs:||Water your hoya as soon as it dries out, or when it is almost dried out.|
|Fertilizer:||Feed once a month in spring and summer, especially when flowering, use a liquid feed with a higher nitrogen ratio.|
|Soil:||A cactus mix mixed with the same amount of orchid mix (bark and perlite).|
|Temperature:||18-25°C (64-77°F) in the day, don’t let them get cold at night.|
|Where to buy:||Try our list of Rare Plant Shops.|
|Common issues:||Root rot|
Welcome to our hoya carnosa guide. Hoyas are a tropical houseplant from the tropics of Asia and Australasia, the carnosa is characterized by it’s pretty groupings of porcelain-like flowers and it’s waxy leaves which have given the plant it’s nickname ‘porcelain flower’.
Hoyas like a good amount of indirect sunlight. They will do ok with lower light conditions, but they grow best with a lot of indirect sunlight. To flower they to get a good amount of indirect sunlight.
How Often to Water
Water your hoya as soon as it dries out, or when it is almost dried out. They do not like to sit in water logged soil, neither do they like to dry out completely. The most common cause of death in this plant is root rot from sitting in water, so be careful.
Hoya Carnosa Fertilizer
You can feed your wax plant once a month in spring and summer, especially when flowering, use a liquid feed with a higher nitrogen ratio.
Hoya Carnosa Soil
Hoyas need great drainage, even well draining cactus soil is not well draining enough for them. You need to remember that hoyas are epiphytic, which means in the wild they do not grow in earth on the floor, but they grow on the side of trees and root in whatever they can find. So putting them in soil can result in root rot as they are not suited to that find of environment.
They need a cactus mix mixed with the same amount of orchid mix (bark and perlite) to make sure it does not hold any moisture.
For more on hoya soil (what to buy and how to make your own) see our guide here: Hoya Soil.
When To Repot
Hoyas like to be pot bound so they do not need repotting yearly. Only repot if the potting medium is dirty or leached out.
Hoyas like humidity, aim for 60%, but they’ll be ok in less. They will do well in normal household humidity, but if you can up the humidity with misting for example, your plants will thank you for it.
Hoya carnosas will do well in normal household temperatures, 18-25°C (64-77°F), in the day. But do not let them get cold, (10°C or 50°F as a minimum).
Why Is My Hoya Carnosa Not Flowering?
Normally they need more light to bloom, get them in a south facing window if you can, just off the side is good out of direct sun but getting loads of light.
Do Hoya Carnosa Grow Fast?
Hoyas in general do not grow very fast and the carnosa is no exception. They can take about 2 years to reach maturity (which is when they can flower) from a cutting.
When Does Hoya Carnosa Bloom?
They normally flower in spring or ssummer.
Is It Toxic To Cats?
They are toxic to cats if eaten, and can cause vomiting and numbness. So seek vets advice immediately if your pet eats any.
Hoya Carnosa USDA Zone
They can live outdoors in zones 10-11.
How to Propagate Hoya Carnosa?
Hoya carnosas are easy to propagate, cuttings can be rooted in water. You need to make sure you have a cutting with leaves and at leas one node below that. Remove leaves from the lower node and put it in a glass of water so that there is at least one node and no leaves under water, but there are leaves above water. Then leave it is a warm and bright spot to root for a month or so before potting it up.
Where To Buy A Hoya Carnosa
You will probably need a specialist seller to get hold of one of these plants, see our article on Rare Plant Shops.
Other Names for Hoya Carnosa
Wax plant and porcelain flower.
Hoya Carnosa FAQs and Common Problems
Root rot is a common issue – do not let these guys sit in water! They must be in a really well draining potting medium with plenty of bark.
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