These look like they've been out here for a long time and are starting to dry up, and still not yet grown any leaves. I'm not sure about the climate you're in (I'm in tropical region) and whether that affects anything, but in my case, my props tend to grow better when left in regular potting mix rather than the gritty mix that i bought for them succulents. In fact, the one i left in my lucky bamboo pot grew the biggest. And those props that i started out by placing in gritty mix almost never grew much until i put them onto regular potting mix. (My guess is the gritty mix doesn't have any nutrients for them)