Question
I have an orchid that seemed to be doing great, old flowers fell off as a new bud was growing.  The I noticed it was taking a while for it to enlarge, checked the pot and it was sitting in water.  I had accidentally over watered it.  I quickly tried to remedy the problem but the top two inches have started to wilt and yellow.  Is there anything I can do to save this orchid or have I killed it?  The leaves seem to be really healthy.

Answer
Dawn, it sounds like you have a phalaenopsis orchid.  The flower spike on phalaenopsis orchids naturally dies back after flowering.  You may cut off the old flower spike without damaging the plant.  The more insidious issue is likely the poor condition of the potting mix.  I recommend the following steps: 1) Obtain a bag of orchid potting mix from a garden center and soak a portion of it, 2) Unpot the plant and discard the old potting mix, 3) Carefully clean and examine the roots and remove any that are mushy (healthy roots are firm), 4) clean the old pot or use a new one to repot the plant, 5) place the pot to be used in an area to allow drainage of excess water and position the plant in the pot so the top of its roots are about an inch from the top of the pot, 5) carefully add to new wet potting mix into the pot, tapping the pot bottom from ime to time to allow the mix to settle around the roots, 6) allow to drain for an hour before placing the plant in an east window and/or under plant lights.  Do not water for a week and then water once per week.  You may begin feeding at 1/4 tsp of plant food per gallon of water as soon as you see new growth.  Please feel free to ask followup questions at any time.