baymule
Sustainability Master
A cinder block wall definitely would make you a micro climate. At our old house, my garden was beds between the driveway and sidewalk, with brick walkways 3’ wide. LOTS of heat collection that radiated back out to the soil. I also commandeered the flower beds against the brick house. I gardened all year long, even through snow events. I have pictures of cabbage, lettuce and broccoli covered in snow, but they survived.My garden is the perfect site: sandy loam, slight S slope. I've been gardening here for more than 10 years, and the soil now has a lot of black humus. Nearings brought the importance/benefit of microclimate to the light of day. So many good concepts to be gleaned from so many authors. I've long thought that a low cinder block wall, or other type of stone wall along N border of the garden would gain me an extra gardening zone!
Here, only 160 miles north, my garden is wide open to the elements. I can’t overwinter anything, it freezes and turns to mush. The temperatures are maybe a degree to 3 degrees colder, often the same, boy no heat sink in the form of bricks and concrete.