Light
Similar to succulents, these heart-shaped hoyas require lots of light in order to grow and thrive indoors. Choose a location for your hoya kerrii that receives several hours of bright, direct sunlight every day. A west- or south-facing window is ideal. If you are lacking in the natural light department, adding a grow light to your setup may be a good idea. A full-spectrum LED grow light is a great choice for hoyas.
Soil
As an epiphyte, hoya kerrii require extremely airy, well-draining soil. Planting them in a regular indoor potting soil without any amendments will lead to compacted roots and stunted growth over time. Instead, use a mixture of potting soil, perlite, orchid bark, and sand that your hoya kerrii will love!
Water
Allow the soil to dry thoroughly between waterings. Hoya kerrii can withstand long periods of drought thanks to their thick, water-storing leaves and are highly susceptible to overwatering and root rot. The amount of water that your hoya kerrii needs will vary by season. In the summer you can water more frequently while in the winter you should cut back on watering significantly. An easy way to tell if your plant is ready for water is to look at the leaves - if they are still plump then it doesn’t need water, but if they are thinner and slightly wrinkled it’s time for a good drink! You can also use a moisture meter to ensure that the soil is completely dry before watering.
Temperature and Humidity
Hoyas thrive in warm, humid conditions and hoya kerrii are no exception. They do best in temperatures from 60 to 80 degrees Fahrenheit, and should not be exposed to temperatures below 50 degrees Fahrenheit. For the most part, typical household humidity levels are fine for hoya kerrii, but they will thrive with extra humidity. Placing a humidifier nearby is one of the best ways to increase humidity around your plant. Alternatively, choose a naturally humid room in your home to grow these hoyas such as a bathroom, kitchen, or laundry room. While they are most commonly grown indoors as a houseplant in the United States, hoya kerrii can be grown outdoors year-round in USDA hardiness zone 11.
Fertilizer
Hoya kerrii are not high feeders but can still benefit from regular fertilization during their active growing period. During the spring and summer, apply a balanced liquid fertilizer once a month to encourage healthy growth.
Types of Hoya Kerrii
Hoya kerriiHoya kerrii ‘splash’Hoya kerrii ‘reverse variegata’Hoya kerrii ‘albomarginata’
Propagating Hoya Kerrii
Hoya kerrii can be propagated using stem cuttings. You can either propagate hoya kerrii in water, or in sphagnum moss. Both methods can be successful, but some people have more success with one medium over another. Here is how you can propagate your hoya kerrii using either water or sphagnum moss.
Potting and Repotting Hoya Kerrii
Hoya kerrii should only be repotted once every few years. These hoyas like being slightly root-bound and can suffer if they are moved into a pot that is too large due to the increased chance of overwatering. When it comes time to repot your hoya kerrii, the process is fairly straightforward. Simply remove the plant from its container, being careful not to break the roots in the process. If its really stuck in the pot, gently squeeze the sides of the container to get it loose, or wiggle the stem side to side as you hold the plant upside down. Once you have removed the plant, gently remove as much of the old soil from around the roots as you can. Again, it’s important to break as few roots as possible so be careful here. Next, you will be moving the plant into its new container. Ensure that you have chosen a container that is only 2 to 3 inches wider than the previous pot. Place your plant in the new pot and fill the excess space with an airy, well-draining potting mix. Water your freshly potted hoya kerrii and return it to its original location.
Common Pests
As with most plants grown indoors, keep an eye out for some common houseplant pests including mealybugs, scale, aphids, and spider mites. Hoya kerrii are not particularly prone to any of these pests, but if you have other houseplants that are infested these pests will also happily take up residence in your hoya kerrii as well. Regularly inspect the leaves and stems of your hoya kerrii for pests to catch any infestations early.
How to Get Hoya Kerrii to Bloom
A blooming hoya is a sure sign of a happy, healthy plant. These hoyas tend to bloom once a year during the warmer months of the year, usually sometime during the spring or summer. Hoya kerrii normally don’t bloom until they are at least 2 to 3 years old, so if you just got your plant and haven’t noticed any blooms this is normal. However, there are a few things that you can do to speed the process along and encourage blooming. First, hoyas tend to bloom more readily when they are root-bound—i.e. don’t give your hoya a pot that is too big! Second, getting enough light each day is extremely important for flowering. Make sure that your hoya is receiving several hours of direct light every day. Lastly, don’t overwater your hoya. They need a good break between watering and will not flower if the soil is too damp on a consistent basis.
Common Problems With Hoya Kerrii
Generally hoya kerrii are not high-maintenance plants and are relatively problem-free for the indoor gardener. Tha being said, there are a couple of things to watch out for when growing these tropical sweetheart vines.
Curling Leaves
Curling leaves can be the result of a number of different issues including overwatering, underwatering, or temperature shock. Evaluate your plant’s growing situation closely to figure out which one applies to you. If underwatering is the cause, curled leaves are normally accompanied by leaf discoloration. Increase watering to prevent future leaves from curling. If overwatering is the cause you will notice signs of root rot below the surface of the soil, or may observe the soil is waterlogged. Repot the plant immediately with fresh soil and trim away any rotted roots. Temperature shock is another possibility and occurs when a plant is subjected to a large temperature change very quickly. Ensure that your plant is in a room with stable temperature and avoid any further large temperature changes.
No Growth
Hoya kerrii are very slow-growing hoyas. That being said, if its been a few years without any significant growth then there may be something wrong with its growing conditions. First and foremost, ensure that your plant is receiving enough light. Hoya kerrii will not grow in low light conditions, and even medium light likely won’t be enough. Second, check the roots of your hoya to ensure its root system is healthy. Overwatering and underwatering can both kill the roots over time, which ultimately hinders growth. If your plant does not have much of a root system, you will likely need to propagate your plant to help it grow new roots and become established again.
