Consider vegetables. A warm January day is a good excuse to get outside and work your garden soil. If you have not had the soil tested in a couple of years, now is a good time to do so. A soil test will give you an assessment of pH and if you need other nutrients, such as lime.Soil recommendations are based on what you are growing or planning to grow. For example, blueberries need a pH of around 4.8, whereas strawberries prefer 5.8 to nearly neutral.