I bought two lithops plants last October. For what it's worth, I THINK I have lesliei v. venteri, just going by Internet photos after sifting through jillions of them. (At the garden center they were labeled "space rocks"
)
So far they haven't done anything. No flowers, no baby leaves in the center. I think I've only watered them twice--once after I transplanted them into their current container, and two days ago when I realized one of the leaves was shriveling a bit (and I only gave two teaspoons of water per plant).
Maybe I just need to give them a little more time? I just thought they would have shown some signs of life by now.
Here's a current photo.