About
Hoya Handbook is a reference for people who grow wax plants and want to know which species they have, how it grows in the wild, and why it is or isn't flowering.
What you will find here
The core of the site is a species database. Each profile records the accepted botanical name, the native range, leaf and flower traits and the care guidance that applies, with a numbered source for every measurement. Two tools are built on that data: the Hoya Identifier, which narrows the list by leaf and flower traits, and the Bloom Troubleshooter, which walks through the documented reasons a hoya does not flower. Guides on light, watering, substrate, pests and propagation support them.
Why species depth
Most houseplant sites cover a handful of popular hoyas and apply the same care sheet to all of them. The genus is large and varied: some species have thick, succulent leaves, others thin ones; some come from lowland forest and others from cool hills. Labels in the trade often use outdated or incorrect names. A reference that keeps the species apart, and says plainly when information is only known at genus level, is more useful than another general care sheet.
Who publishes it
Hoya Handbook is published by Hoya Handbook, based in United States. It carries display advertising served by Google AdSense. It has no sponsors, no paid placements and no affiliate links, and advertisers have no say in what the pages contain.
How the content is made
Pages are drafted with the help of AI tools from primary sources (floras, original species descriptions, taxonomic databases, botanic garden and university extension publications), then checked by the publisher before or after release. Each page shows whether that review has happened. The full process, including what we do not do, is described on How we make this.
Corrections
If a page is wrong, please get in touch and include a source. Corrections are made on the page and the "Updated" date changes.