plants less than a month old could be harmed by too much fertizer....I've noticed from over 20 plants that the nutrients in store bought soil that was developed for flowers has all the nutrition the plants need for their first month.

Afterwords, a all natural, fertizer diluted with water that is available at most big stores is sufficient.

I recommend the fertilizers that were are developed for "blooming", especially around the plants flowering time

read the intructions on the bottle