You can test your own soil! Take two separate cups and add your soil sample to each. In one add vinegar and the other add some water, stir and add baking soda. If nothing at all happens your soil is some what PH balanced.
Vinegar: Take a sample of dry dirt (about cup), mix with distilled water to make a liquid and then start pouring household vinegar over top. If the mixture fizzes, alkaline. Baking soda: Mix dry dirt and distilled water as above then
Could it be your Soil pH levels are off ? How to test if your soil is alkaline or acidic and what to do to fix it - if it's acidic add limestone, if it's alkaline add coffee grounds, sawdust, or peat moss to lower the pH of your soil