Chemical and organic fertilizers are commercially available, manufactured and packaged with convenience of application in mind. With fertilizers distributed in powder (dry), liquid, and just-stick-it-into-the-soil form, plant owners can now choose which manner of plant feeding is most appropriate for their greenery and lifestyle.
Most fertilizer packages are labeled with "Ideal for Plants X, Y, and Z" complete with detailed instructions on manner, quantity, and frequency of application. Choosing and administering fertilizers, even for the novice gardener who is just starting to grasp the meaning of NPK 6-12-6, has become as easy as 1-2-3.
So, what are those numbers and what is NPK? The standard "complete"
fertilizer is composed of nitrogen (N), phosphate (P), and potash (K),
combined in various percentages (6-12-6 means 6% N, 12% P, and 6% K) for different plant needs.
Most indoor plants will be happy with a balanced fertilizer with equal parts NPK, such as 10-10-10. In fact, many plants will do just fine without any fertilizer at all. So use a light hand when fertilizing your plants. Use less than what is recommended on the fertilizer package - too much will do your plants more harm than good.