Hoya pubicalyx 'Royal Hawaiian Purple'

Hoya Pubicalyx 'Royal Hawaiian Purple'

The Hoya pubicalyx 'Royal Hawaiian Purple' is a stunning hoya that is native to the Philippines. Also known as the Hoya Chimera, this hoya is noted for its beautiful foliage, but even more so for its glorious flowers. 

This plant features large, shiny green leaves that when kept in direct sunlight, they turn a reddish-pink colour. The leaves also feature silvery or grey specks of variegation. 

However, this houseplant's pink and purple flowers, some of which are shaped like stars and bloom in clusters, are its most alluring feature.


The flowers of the Hoya pubicalyx 'Royal Hawaiian Purple' grow in clusters that are perfectly ball-shaped. The blooms have bright purple corollas with dark pink coronas that have yellow centers. It will probably bloom between mid-spring and the beginning of summer. Like other hoya species, it also has small blooms. Each flower measures only 0.4 inches (10 mm). Nevertheless, they develop in groups known as umbels. There are typically 20 to 40 of these lovely flowers on each umbel. As a result, these clusters can grow to a diameter of about 4 inches (10 cm).

The flowers are fuzzy at the edges, giving the appearance of a silvery margin.


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Scientific name: Hoya pubicalyx ssp

Common names: Hoya Chimera, Royal Hawaiian Purple

Origin: Phillippines

Flower colour: Purple and pink 

Genus: Hoya

Family: Apocynaceae (Asclepiadaceae)

Kingdom: Plantae

Type:Flowering vine

How to care

Hoya pubicalyx 'Royal Hawaiian Purple'

Despite its exotic appearance, the Hoya pubicalyx 'Royal Hawaiian Purple' is rel;atively easy to care for. Dright indirect light, warm temperatures and semi-humid conditions can help this hoya thrive.


  • Bright indirect light
  • Temperature range 50-86 degrees F.
  • Humidity range 50-70%
  • Well-draining soil with organic content
  • Fertilizing during the growing season, ideally once a month.

Hoya pubicalyx 'Royal Hawaiian Purple' Detail

Light Requirements:

  • Bright light is ideal for the Hoya pubicalyx 'Royal Hawaiian Purple'. Also, it should be kept inside. inside a well-lit space. It will be able to grow best as a result.
  • The plant's leaves will turn bronze or reddish in colour if kept in direct sunlight. This is a sign that the plant is under stress from the sun.
  • Due to the plant's gorgeous and distinctively coloured leaves, many growers maintain the plant in this state.
  • Additionally, this additional light encourages flowering and hastens the growth of leaves.
  • This is the way to go if you want your Hoya pubicalyx 'Royal Hawaiian Purple' to become bushier and produce more blooms.
  • But keep in mind that this has a limit. The plant's leaves will eventually become sunburned if they are exposed to direct sunlight for an extended period of time. Therefore, filtered or indirect light is preferable.

  • The plant prefers partial to complete shade outside. especially the latter in the afternoons, when it is the hottest. Make sure to keep it outdoors in filtered or dappled light.

Temperature Requirements:

  • The plant is one of the more cold-hardy hoyas. As a result, it can tolerate temperatures of 50 degrees Fahrenheit during the winter without any issues, especially when there is plenty of light.
  • However, the temperature range between 60 and 86 degrees Fahrenheit is ideal for it. It will grow the quickest and feel the most comfortable here.

Humidity Requirements:

  • The ideal humidity range for the Hoya pubicalyx 'Royal Hawaiian Purple' is between 50% and 70%. Because of this, it is ideal for tropical climates, greenhouses, terrariums, and grow cabinets.
  • However, the plant can also withstand 40% and higher levels of average home humidity. It can do this because of the leaves' thickness and succulent-like texture.
  • The plant can store moisture as a result. And by doing this, it can withstand some drought and low humidity. This makes maintaining the plant inside most homes simpler.
  • Nevertheless, you may need to keep an eye on the plant to see if its leaf tips turn brown or crispy on the tips if you live somewhere with dry air or where the summers are very hot.
  • Purchase a humidifier to achieve this. Misting also works if you prefer something that is cost-free. Although its effects are fleeting, you'll still need to mist frequently.
  • A pebble tray on top of the plant, grouping it with other plants, or moving it to a more humid area like the bathroom are additional options.

Watering Requirements:

  • The plant requires constant summer watering. This amounts to about once a week (every 4 to 8 days), give or take, depending on the weather and the plant's exposure to sunlight.
  • But you should cut back considerably during the winter.
  • The plant stores water in its foliage like a succulent. That's why it can go without water for quite some time. The environment is also ripe for overwatering because of the cold winter weather and lack of light.
  • To prevent this from happening, make sure the plant gets enough air during the winter and stays dry. Water should only be used once every 14–21 days. At this time, it also only needs to be watered once a month.

Soil Requirements:

  • Because of its epiphytic nature, the Hoya pubicalyx 'Royal Hawaiian Purple' requires a soil that is both porous and well-drained.
  • In this way, water is drained from the soil and the area does not become too soggy. And there's plenty of oxygen reaching the roots.
  • This is significant because the plant relies on trees for support in its natural environment. As a result, the wind can easily reach its deep roots. They quickly dry after getting wet in the rain.
  • Any do-it-yourself potting mixes for Hoya pubicalyx 'Royal Hawaiian Purple' can work to create this environment.
  • Materials like perlite, pumice, vermiculite, orchid bark, pine bark, charcoal, and similar materials can be used. All of them work to speedily expel excess moisture, preventing root stagnation.

Fertilizing Requirements:

  • Feed the Hoya Pubicalyx Royal Hawaiian Purplepubicalyx 'Royal Hawaiian Purple' a well-balanced, water-soluble fertiliser twice per month during the growing season (spring and summer) (15-15-15 N-P-K).
  • Being an epiphyte, its root system is small and limited. In addition, it does not require a lot of fertiliser. If you want to use it properly, just stick to the label's recommendations.
  • Bloom boosters and bloom fertilisers are applied to plants just before they are about to bloom to encourage them to open their flowers. Doing so will encourage flowering and help extend the blooming period.
  • During the winters, so not fertilize your hoya.


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