It may be Winter (in USA & Canada ) but we are all dreaming of our spring gardens.
I am planning, buying seeds and making sketches of where I am going to plant.
Companion planting for health and best taste of the vegetables takes some thought and planning.

The 2012 USDA Plant Hardiness Zone Map is the standard by which gardeners and growers can determine which plants are most likely to thrive at a location. The map is based on the average annual minimum winter temperature, divided into 10-degree F zones.

 http://planthardiness.ars.usda.gov/PHZMWeb/

Click on each state for a more detailed view.

http://www.vegetablegardener.com/item/2961/cut-and-come-again-lettuce-sampler