40d:Why are crops sometimes displayed with red writing

Because it is too late in the season to plant that kind of crop. There is also a bug that causes it to happen for plump helmets late in the winter even though they're supposed to grow year-round.

Farming FAQ
How do I build a farm?
How large a farm do I need?
What is the best crop?
How do I manage my seeds and crops?
What does "Reserved Barrels" and "Reserved Bins" mean?
Why are crops sometimes displayed with red writing?
What do I do with these inedible crops?
What does the option "Fallow" mean?
My dwarves will only farm on a small part of the fields, why is this?
How do I make absolutely sure my farm plot is all set to produce crops?
If I don't see any dwarves working my farm plot, does that mean there's something wrong?
Can you grow surface crops on multiple z levels in a tower if the floors are glass even though there's soil on the glass?
What is the "seas fert" option for?
How do you create a custom stockpile that accepts only prepared foods?
How do you successfully breed and utilize animals(grazing, non-grazing and poultry)?
How often do you need to irrigate your farm fields?
Having banned seeds from the kitchen, how to prevent dwarves from eating them raw?
Why do my planters keep complaining they have no seeds?
Why won't my animals breed?
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