Easy to grow, great to look at home variety. Carrots have bright purple skin, with flesh that comes in a deep orange. They produce long, slender and sweet-tasting roots that will be a real eye-opener for anyone that thinks a carrot has to be orange. When to Plant. Zone 1: September - February Zone 2: September - May Zone 3: February - November Zone 4: February - November For zone map CLICK HERE Soil Prepare a well dug through, friable soil type that is free draining. Use well-rotted organic matter and manure when preparing the beds. Soil pH Level 6.5-7.5 Position Full sun preferred but will tolerate partial shade. Best to follow a crop of nitrogen-hungry leafy greens.