Hoya kerrii Craib

Natural Habitat

Plants of the World Online describes Hoya kerrii as a climbing epiphyte or lithophyte in the wet tropical biome. It can grow on other plants or on rock. This broad description is not a measurement of the conditions around every wild plant, and it does not give an indoor watering schedule.

Publication and naming history

William Grant Craib published Hoya kerrii in 1911, in Kew Bulletin on pages 418–419. The name honours Arthur Francis George Kerr, whose plant collecting in Thailand is described by NC State Extension.

Historical names explained

Plants of the World Online accepts Hoya kerrii as a species. It lists Hoya obovata var. kerrii (Craib) Costantin, published in 1912, as a synonym. An older label using that combination does not describe a separate cultivated form.

The plant, leaves and flowers

Hoya kerrii is a climbing plant with thick, broad leaves. The notch at the tip gives the leaves their familiar heart-shaped outline.

Suan Luang Rama IX Foundation (2023) describes clusters of creamy-white flowers with purple colouring. NC State Extension — Hoya kerrii describes reddish-brown nectar dripping from the flowers. Nectar is a flower secretion, distinct from the white latex described in the plant’s tissues.

These descriptions concern the species accounts. They do not authenticate a named cultivated selection, and a heart-shaped leaf alone does not establish a plant’s identity.

Single-leaf pots: will a heart leaf grow into a vine?

Hoya kerrii is sold as rooted stem cuttings and growing plants, as well as the small pots containing just one heart-shaped leaf that appear around Valentine’s Day. It is those single-leaf pots that raise the question: will the leaf eventually produce a stem and more leaves?

Iowa State Extension — All About Hoyas explains that a detached leaf can root without becoming a vine if no stem node was included. NC State Extension — Hoya kerrii gives a qualified account: single rooted leaves are unlikely to grow well unless some stem tissue was attached when they were cut. A stem node is the point where a leaf joins the stem; it is different from the leaf stalk.

If you want a climbing plant, Iowa State recommends buying a stem cutting with at least one node or a plant with a growing stem. A healthy-looking leaf and roots alone do not show whether a node is present beneath the potting mix.

Sap, flowers and identification

The colour of flower droplets should not be recorded as the colour of the plant’s sap. The botanical description distinguishes white latex from the reddish-brown nectar described in the flowers.

Record sap alongside leaves, flowers and provenance. White latex alone does not identify a plant as kerrii.

Is Chiang Dao Silver related to kerrii?

The name Hoya sp. Chiang Dao (Silver) is used by Hoya Cuttings. Unsolicited Plant Talks suggests that Chiang Dao material could be a natural hybrid involving Hoya kerrii. That is a nursery hypothesis, not verified parentage. Its account also does not establish that its plants and every plant sold as Chiang Dao Silver are the same material.

The resemblance raises a useful identification question, but silver colour and a heart-shaped leaf do not settle it. The relationship remains unresolved in these accounts. Keep the Chiang Dao Silver label with the plant’s supplier and provenance rather than relabelling it as a form or hybrid of kerrii. Authenticated flowering material and a published comparison would help resolve the question.

Hoya kerrii and Hoya carrii are different species

Hoya carrii is a separate accepted species in Kew’s Plants of the World Online, first published in 2017 and native to Papua New Guinea. Hoya kerrii was published in 1911 and has a native range from Indochina to western Malesia. The similar spellings do not make carrii an alternative spelling or a cultivated form of kerrii.

Check the complete name on labels and references. A name comparison distinguishes the two species; it does not identify an unlabelled plant from its foliage alone.