Coleus collapse

[ber77tie]

I had two coleus plants looking great.they got to about 2 foot high and looked really healthy.all of a sudden they looked as if they were wilting but the soil was still moist.They  have continued to collapse.i've checked for weevil but no sign.Has anybody got any ideas what I've done wrong?

[ber77tie]

[goodlife]

Has anybody else watered you plant by any chance? ....over watering damage on the plant looks same as if it would be wilting for dryness. Too much water can rot the roots and when there is not enough roots left to support the leaves, they will droop and die.
There is number of things that could 'go wrong' but that is the most common that came into my mind straight away.