." >> steve mcshane here, mcshane's nursery and landscape spot, also known as dr. dirt. has your soil got you sick? well, i might have the remedy. take a look at this medium, breathing with life. soil is where it all begins in the garden, teeming with microorganisms, as much as a billion per teaspoon. it's just marvelous. microorganisms are what bringing--breaking down that nutrients and making them plant-available. one of the most important things when talking about soil microbiology is temperature. i keep a soil thermometer in my garden, because when things get to 50 degrees or higher, microbial activity spikes, making those nutrients available. now, there's some things we can do to get microbes goin'. first one is kelp. second one is alfalfa. by adding either of these amendments to the soil, studies have shown populations spike. there's also some trace nitrogen. and knowing that microorganisms are feeding on organic matter, i recommend adding some every year. maybe an inch to the vegetable garden or under the drip line of a tree goes a long way. and if you're like mos