In reply to CJD:
Ooh, they look high maintenance.
We are terrible with plants - have a money tree, which somehow manages to keep growing despite its sporadic watering schedule (it just looks dehydrated when it's not been watered in ages, then plumps up again when it has been); two dead gerbera plants (they revive a treat when watered and dead-headed); one pointsettia (dead I think) and one cyclamen (strangely live).
You need some more hardy plants. Or more water?
Perhaps you're over-watering them - that's what we did to the poinsettia.