6-6 Carrots weeded and thinned only once if done right Published May 4, 2011 at 450 × 600 in Gardening Made Easy – For Moderate to Arid Climates ← Previous / Next → Thin Carrots with First Weeding Thinning carrots with the first weeding will help your carrots achieve optimal size, not to mention the fact that it’s a lot easier to thin them when they’re mere fledglings.