Question
I have had a white phalaenopsis for the past two years.  While flowering last season my little grandson picked all the flowers and remaining buds off and this season I am battling to get it to flower properly again.  The plant seems to be healthy but for one or the other reason the little buds turn yellow and fall off - they just don't seem to grow big and open up. I water the plant regularly and is standing on a window sill in my kitchen with enough light facing south. Please can you assist.

Answer
Charmaine, the first action I would recommend is to repot your plant if it hasn't been repotted in the past year.  Repotting will enable you to see if you have any root damage-- which often occurs as the potting mix breaks down. Damaged roots are mushy and need to be removed before repotting. If the potting mix has broken down, it remains too wet after watering and that leads to the root damage.

Be sure to use a commercially prepared orchid potting mix.  There are several types available.  I recommend the kind that contains fir bark.  Particle size should average about 1/2 inch.  Also be sure you are using a plastic pot with lots of drainage holes in the bottom,  Soak that portion of the potting mix you plan to use for at least an hour as dry fir bark tend to repel water.

Do not look for the plant to flower until late winter as it takes time to generate healthy new roots.  Good flowering is faciliatated by adequate light.  If the plant's leaves are dark green, it has not been getting enough light to generate the flowering hormones.  Also, you didn't mention feeding.  If you have been feeding with a high nitrogen plant food (ei the first number is the highest such as 30/10/10#, that prompts the plant to put on more vegetative growth at the expense of flowering.  Use a balanced fertilizer #eg. 20/20/20) or, in a few months, use a plant food called a "bloom booster".