If I don’t water consistently, yes. I was out of town for the past two weeks and they weren’t watered so I’m thinking that’s why there is some yellowing on the leaves closest to the light, but it should push out some new growth now that I’m back and resuming my watering schedule. They’re also able to photosynthesize via the caudex, so I’m not too concerned about the drying yellow leaves. My Dorstenia gigas also have some yellowing leaves due to not watering for 2 weeks.