Tropical Zone Gardening: A "root conundrum"...., 1 by AlohaHoya

AlohaHoya wrote:
Here is a situation that has me puzzled and I am asking around to see if there are any answers.

1. Involves the same genus - Hoya.
2. Involves two countries: Australia and USA (Hawaii)

Problem: Cuttings from one of the country's growers root immediately after a long distance trip. The other growers' cuttings almost never root (not anyone in the usual thread of suppliers...just a little choice grower around here). This has been going on for years...and I cannot figure out why.

Both growers have beautiful plants. Both growers fertilize regularly and water as should be.

What would be the cause of the difference in the ability to root?

Carol