Dill - why does it keep dying? Help, please.

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I am no gardener, but do my best. I have a large trough planter for kitchen herbs, which I've been cultivating for three years.
The mint (in a little pot of it's own), oregano, parsley, thyme and chives. I've had three lots of dill, which I buy from a good nursery, but they have all died. The first one lasted eighteen months so, but the last one was dead within a fortnight.
What am I doing wrong? Does it not like company? Should I keep it separately to the other herbs, or does it need a different soil mix, more or less watering, some special feed? Or should I just give up and use dried, because I never see fresh cut in the supermarket.
TIA

As far as I remember, dill doesn't like being transplanted and ideally should be grown from seed where you intend to keep it.

My parents grew loads for pickling in a hot climate, and in the garden rather than pots. I think it's a bit fussy in a pot.

Thanks Hammy, that makes sense. The nursery man did say it was grown from seed and could be difficult, which was why there were only a few pots of it, compared with all the other herbs there. Didn't say I should not transplant though, might ask for my money back.
I will buy some seeds and try again. If that doesn't work, I will give up!

Slugs and snails love dill.

I've given up growing it because the buggers eat it all up.

Dill is monocarpic - it dies after setting seed and is usually grown as an annual.

If you leave it be where you have put the seeds in, its quite a hardy plant in warm climates, actually. Needed very little looking after, and grew absolutely everywhere. Just don't mess with the roots!

Thanks for replies.
I will get some seeds and try again.
It's a large planter with a 'overhang' on the rim, so haven't had a problem with slugs and snails up to now.