1.   A light frost has turned most of my vegetable garden to brown vines, but the collards and mustard greens love the cool weather.

2.   I cut them back late in the season, and when the first frost turned the foliage to slime, I cut them back again.

3.   It keeps blooming after the frost has turned all else to limp brown rags.

4.   As spring warms southern Mars, the frost turns directly to gas.