Hoya curtsii is an epiphyte, best mounted on the bg and allowed to spread and cascade down.. although I'm sure with good drainage it can do well on the ground as groundcover. if I'm mistaken and number 6 is D ovata and not P angulata then number 6 is an epiphyte too! Although alot of peperomias do nicely mounted epiphytically as well... sorry if I'm confusing you..Thanks for replies guys.. all of these are terrestial except the Neo?