The best fertilizer you can give any plant is rich composted soil with the proper pH. Then, of course, sun and water. Carrots and most root crops like loose soil; sand helps to "loosen" soil: It is not a moisture retainer; it helps sand to keep from clumping. It is not a guaranteed solution but if your soil is heavy, it might help to "open" it. A common hazard of all tops but no roots or small roots is failure to thin the crop—carrots and beets esp. You need to make the sacrifice and pull the weaklings, leaving plenty of space for larger carrots to develop. Finally, we are back to the first point: your soil: Too much nitrogen fertilization can contribute to excessive top growth and little to no root growth. Check the contents of whatever fertilizer you have been using.
We hope this helps!
The best fertilizer you can give any plant is rich composted soil with the proper pH. Then, of course, sun and water. Carrots and most root crops like loose soil; sand helps to "loosen" soil: It is not a moisture retainer; it helps sand to keep from clumping. It is not a guaranteed solution but if your soil is heavy, it might help to "open" it. A common hazard of all tops but no roots or small roots is failure to thin the crop—carrots and beets esp. You need to make the sacrifice and pull the weaklings, leaving plenty of space for larger carrots to develop. Finally, we are back to the first point: your soil: Too much nitrogen fertilization can contribute to excessive top growth and little to no root growth. Check the contents of whatever fertilizer you have been using.
We hope this helps!