Double feature of the fantastic ones, then.
>Galloping Wheat (known also as tumblewheat)
Appearance: Like golden wheat, but somewhat taller. Grows a second root structure pointed upwards.
Climate: Prefers warm climates. Dies very quickly in cold climates, due to the cold causing it to become too rigid to 'tumble', instead snapping it.
An unusual grain of unknown origin, the galloping wheat has roots at both its top and bottom. When a strong wind pushes it over, it uses some unknown mechanism to push its top-roots into the ground and uproot its bottom roots, dropping seedlings throughout. This can cause the grain to move as much as a foot at a time, and during strong winds the grain can "tumble" very quickly, seeding entire fields.
Farmers have thus far failed to utilize the grain on a large scale, due to the fact that it's surprisingly good at climbing cracks in rocks, slipping through fences, and having a somewhat lower yield than traditional crops. Nomadic tribes, however, have found a love for the stuff, and have invented special nets to harvest it as it tumbles through.
>Bitebulb (known also as frostbulb or 'fecking cold')
Appearance: Large (up to 6in. across!) round brown bulbs with a thick rind, usually found covered in a layer of ice. Seed pods sprout from the top.
Climate: Only grows in winter, because spring and summer heat will cause its insides to boil.
Bitebulb is a supernatural plant found in the drier bits of the forest. It draws in heat from its surroundings to protect its vitals during the winter, but has no control over this- high heats will be absorbed quickly, boiling the plant's insides. Makes a nice quick meal, if you're starving.
When dead, it loses most of these properties, but remains an excellent preservative. Mixed with salt, it can be put on meat to make a jerky that won't be going bad any time soon, though its flavor is a bit bitter.