65-70 days. Purple carrot Seeds. Daucus carota subsp. sativus. Non-GMO. Heirloom. The Purple Carrot is unique in that it appears quite differently when it is sliced than when it is pulled. These carrots have a deep purple exterior, but when they are cut into, a bright orange interior is revealed. They grow to be up to seven inches long with a tapered end. They are quite sweet and tender. This variety does well in areas in the garden with full sun, in zones three to nine. The roots grow straight down, so they require a soil free of rocks, preferably sandy. The Purple carrot is ready to harvest between sixty and seventy days. ~18,000 seeds/oz.