Many plants are affected by different diseases. Each year there are different varieties of vegetables developed that are more resistant to diseases than others. Check your local garden center for the latest information on the most disease resistant varieties. Rotate your crops for better production each year. After the seedlings are about 1 or 2 inches high, thin them out leaving only the healthiest plants.
Carrots grow well in most climates.
They prefer full sun. Carrots do not require much fertilizer. During the winter you can add ashes from the fire place to an area where you want to grow carrots the following spring. Onions are great companions plants for carrots. Thin carrots when they are about an inch tall.