I found the following websites useful for learning about Hoyas.
- Dale Kloppenburg #1
- Dale Kloppenburg #2
- Frostvit
- Homestead Brooklyn
- Hoya Treasures
- Hoya Cultivars
- Hoya Passion
- Kew
- My Hoyas
- Vermont Hoyas
- Pakeha’s Hoya
- Unsolicited Plant Talks
- Swedish Hoya Society
- Stemma Journal
Learn about semi-hydro (LECA and pon)
The absolute best people to go to for passive/semi-hydro advice.