Find out if your garden soil is lacking before you do your spring planting. You can test your soil quality by planting radishes and watching them grow and checking them out after harvesting to see if there are pest or dieases and by checking the harvested radish you can find out if the soil is lacking. If you got great greans but not much radish you can fix the soil to correct the problem. If the leaves are yellow instead of green that is a different lack and you can fix it as well. Check out all this great info on Mr. Brown Thumb.