When we moved into our house about 5 years ago, the drive way was flanked by a row of beautiful healthy orange clivias. Since this time, we completed a necessary improvement to the driveway and a small retaining wall was built. My father in law built it, and has certainly back filled it with a lot of fill (gravel/rubble), then a layer of geofabric about 1 foot from the top, upon which the clivias were replanted. They probably don't have enough top soil, and the geofabric is probably making the drainage difficult (at least that's what I assumed. Big mistake!

As you can see, they aren't doing too well now. Last year they weren't thriving and were yellowing a little. This year they've deteriorated a fair bit more, and I think we may lose them. We've had a really wet winter here in the Adelaide (south australia) hills.

I've dug a big trench immediately behind them, where there is no geofabric and soil depth is probably better, and thought they might do better if I replanted them there. But given they have already been replanted once, and the move might just top them off. I'd be grateful on any advice on whether I should consider moving them, and if so, any soil preparation tips? If I leave then in situ, is there anything that might improve their condition?

I'm not overly worried about the amount of shade/light since I know the plants did so well in this spot when we first moved in.

Thanks so much for your advice in advance!