You are growing on a mixed plot of above ground/subterranean. That, or all your seeds are forbidden/inaccesible/destroyed.
Halp, how do i keep my dwarves out of a spot?I had a unlucky guy on ice when it melted.
Using zones, place a traffic zone over every frozen water source and then set it to restricted movement, unless dwarves absolutely must use it they will take the way around the restricted zone.
2D Minecraft, eh?