While spring technically begins on March 21st, it's important to take your climate zone into consideration. "Remember, most plants prefer frost-free conditions and soil temperatures that are 50 degrees Fahrenheit or higher," Richerson said. "You can use a cheap kitchen thermometer in place of the more expensive soil thermometers -- simply insert the probe into the ground and let it sit there for five minutes so you know you are getting an accurate reading." In terms of gardening, spring starts when the soil says so.
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