Experienced gardeners often grow two crops of carrots, an early crop and the main crop. The early crop is grown for immediate use, while the main crop is harvested for more long-term keeping and use during fall and winter. Since carrots tolerate cool growing conditions, the early crop is sown in April. Sowing for the main crop typically runs from June to early July, so we’re very near the optimum planting time. The most common mistake beginning gardeners make when sowing carrot seeds is planting them too deep. The seed packages usually say something like “place the seeds in a furrow, cover wit…