According to the calendar it’s almost May, but a step outside in the brisk weather says otherwise. Tonight’s low is forecast to be 37 degrees with the possibility of frost and Tuesday the low is 47 degrees, so it’s time to start thinking about protecting outdoor plants.

In a blog post, Walter Reeves the Georgia gardener suggested covering plants with cotton pillowcases and sheets or even a cardboard box that’s weighted down with rocks. The protective covering will keep the plants safe overnight and can be removed the next day when temperatures begin to rise again. This technique works best when temperatures are only expected to drop one day.

If temperatures stay chilly over the course of several days Reeves advised covering plants in black plastic material—not clear. Even on a cold day, the clear plastic sheeting can trap heat from the sun and cook plants.

What are your tips for protecting outdoor plants from a cold snap? Share them in the comments.