Below is a pic of a couple of 4 prongers up in my seed producing bed.
Most of the seng around her is up at this point, but some is just up, and some is about half way up but not filled out completely (like these 2 - 4 prongers).
Our early spring was cool and a little wet, but then we got a few weeks of nice warm weather but it was quite dry.
I think that is making the seng a little slow on coming up and filling out this year. It seems to be a little behind where it usually is by the first of May.