TheScullster writes

"K" wrote

But the subject is carrots!

Sorry Kay

To clarify, it is certainly carrot seed that was planted but it looks like
grass seed sprouting.
One or two blades showing above ground, but stopping at about 1" (25mm)
high.
Is this to be expected?

The blades are the cotyledons or 'seed leaves' - they provide the first
bit of food while the seedling gets established. There should be two of
them on each seedling. There will be a pause while the seedling gets a
few roots going, then it will produce the first true leaves, which are
fine and feathery.

Most of the carrot family seem to produce long thin cotyledons.

--
Kay