Long Island Mammoth. My cilantro and dill plants have both gone from sturdy, tall-standing stalks to green, limp-spaghetti piles of fail.

In most cases, this problem is temporary and harmless.
Dill doesn't like too much water. As with any variety of Dill, this plant forms taproots and doesn’t transplant well. I'm not sure what I did wrong, but thought maybe somebody here could help? Basics: Both plants were started from seed and sprouted relatively quickly.

So if you’re growing it in a container, be sure that it is at least 12-14 inches deep and wide because the Long Island Mammoth can grow up to a height of 36 inches with a spread around 24 inches. Problems with dill plants aren’t too common, as this is a hardy, “weed-like” plant, which thrives in conditions more tender specimens can’t tolerate. It is very much a hardy plant in dry soil. However, yellowing dill plants can be an indication of incorrect cultural care, improper site or even insects or disease.

One of the most common reasons a plant goes limp is high temperatures.

Sounds like it is def overwatered.

Many garden vegetables often wilt … Mine thrives in the heat with water every 4-7 days. Dill is one of the easiest herb to grow, needing just average soil, plenty of sunlight and moderate moisture.