Why have I copious thick leaves and no flowers on my mesembryanthemum

Surprising, as they are usually good flowerers. Are they in a sunny spot? Or shade. If in heavy shade, they may not flower but I don't know of any other reason!Are they being given too much water, perhaps?

They are Summer/Autumn flowering plants could you just be a little impatient give them another week or two. They need a very sunny place otherwise the flowers close up out of the sun.