I keep getting white spots on my radish leaves. Also, if you can tell me how the soil should be prepared and what type of soil is best for growing radishes, as I haven't had much success. At times they seem to bulb but most times they just grow like thin roots. They're not overcrowded. I only sprinkled a tiny amount of seeds.
Certified GKH Gardening Expert
Are the spots powdery in nature or bleached out looking? It could be attributed to either powdery mildew or from water spots associated with overhead watering or splashing of the leaves. Limiting overhead watering will help with this water spots. The powdery mildew can be treated with neem oil, which is an effective and safe fungicide. It will also guard against many insect pests. Here is more information: https://www.gardeningknowhow.com/problems/pests/neem-oil-uses.htm
Add some bone meal to the soil when planting, which will help with growing larger radish bulbs. This article will also help: https://www.gardeningknowhow.com/edible/vegetables/radish/tips-how-plant-radish.htm