People love strawberries. Gardeners who are new to growing strawberries often start out with dreams of bushels of berries and end up with virtually no harvest at all. One of the common causes of this undesirable phenomenon is overzealous fertilization by well-intentioned budding horticulturalists!
Don't Over-Fertilize Healthy Strawberry Plants
When strawberry plants have access to seemingly unlimited resources, they tend to get fat and happy. Just like a 500 pound behemoth of a sloth who has millions of calories within reach of his armchair won't go out of his way to be productive, strawberry plants who sit in an environment saturated with high concentrations nitrogen, potassium, and phosphorus think good times are here to stay. So, they don't produce much of harvest. They will devote their production to vegetative output. While it is true that strawberry plants have many medicinal uses and useful compounds, most people would prefer the simple delight of the strawberries themselves.
What to Do to Fix Over-Fertilized Strawberries
If you have been a fertilization zealot with your strawberry patch, it is likely going to take some time to fix the problem. The problem of over-fertilization is solved by leaching with water. Some patience is needed. You can speed the process by watering, but caution must be exercised as excessive watering can cause diseases (see the Strawberry Plant page for more). The easiest and safest way to ameliorate the problem is to simply not fertilize between now and the next growing season, and let the rain leach the excess N, P, and K.
For nine more reasons your healthy strawberry plants aren't producing strawberries, see this page: Strawberry Plants Producing Runners but no Strawberries