We are inclined to think the problem is in the soil. Dill will grow in poor soil; but if you have not already, you could try well-drained/draining composted soil, and full sun. There seems to be enthusiasts of both camps (poor soil, composted soil). It does not do well when over watered or in rainy season. One other thought, going back to the soil: What is the pH of your soil? Dill likes a neutral pH of between 5.5 and 6.5. An extreme acid or alkaline soil could be the issue here, if all else is as it should be.
We are inclined to think the problem is in the soil. Dill will grow in poor soil; but if you have not already, you could try well-drained/draining composted soil, and full sun. There seems to be enthusiasts of both camps (poor soil, composted soil). It does not do well when over watered or in rainy season. One other thought, going back to the soil: What is the pH of your soil? Dill likes a neutral pH of between 5.5 and 6.5. An extreme acid or alkaline soil could be the issue here, if all else is as it should be.
We hope this helps!