So you want to have a successful garden you say? Well do you know what zone you are in? No? Well let me help you. If you hang out with or around any gardener long enough you will hear the terms zone, and micro climate often enough. But what do they really mean and why do you need to know about them? I could try to explain them to you but with so much information out there it is far easier to point you to the experts. Here is what The Arbor Day Foundation has to say about Plant Hardiness Zones: http://www.arborday.org/treeinfo/zonelookup.cfm Now that you know a little more about zones what is a micro climate? Well you see that last line about local variations? That is talking about how things such as a concrete patio, or a line of trees that shades part of your daytime sunlight can alter your zone. Example 1: You are growing a plant on the south side of your house. There are no trees to block any sun, but there is a structure that blocks most of the wind in that location. Because of the thermal mass of the house and it's ability to retain heat, as well as that location having less wind (therefor staying warmer); that particular location may be 1 or 2 climate zones WARMER than the rest of your yard. Example 2: You are growing a plant on the north side of a tree line. All around the location there is flat grassland. Because of the lack of sunlight to warm the ground as well as no protection from wind this location may be 1 or 2 climate zones COLDER than the rest of your yard. Soil types (i.e. sand v.s. clay) can also have a big effect on the exact zone of your location. To help locate what zone you are in I suggest taking a look at the USDA Plant Hardiness Zone Map found here since it includes recent climate changes.