When it comes to indoor plants, fertilizer is vastly over-rated and over-promoted by manufacturers and retailers. The packaging seems to imply that there is a special fertilizer for every different type of plant species so you will buy lots of different kinds and waste most of them.
In reality, most indoor plants use nutrients in extremely minute quantities and need replenishment infrequently. The specific nutrients needed and in what proportions are well known. (See the Dyna Gro Foliage Pro label for that information.)The addition of vitamins and hormones and anther additives is a waste. Don't waste your money on products like Superthrive.
The use of organic vs commercially manufactured fertilizers is a matter of personal preference. The plants don't care about the source of the nutrients as long as they get an adequate supply of those they need.
Plants that are ailing, languishing or simply growing very slowly in low light do not need any fertilizer. Only plants that are healthy, growing vigorously and have not been repotted in at least 2 years need fertilizer.
Whatever fertilizer you use for your indoor plants should be diluted to half-strength recommended on the label. The label directions are based on plants growing in the ideal environment of the greenhouse, not our homes, so they needed to be diluted.
Dyna-Gro has a variety of fertilizers that are available. If you stick with their Foliage Pro it will be fine for all your indoor plants. It is complete and includes minor and trace elements as well as the macro nutrients. It is a liquid that you dilute and it has no odor that I have detected. If you prefer another product then check the nutrient list on the Foliage Pro label to determine just want nutrients your plants will need from any other fertilizer. Always refer to the small print nutrient list on the label and ignore the bold print marketing hype.
If a plant shows symptoms of what online photos say are nutrient deficiencies, check the soil and water pH first. If the pH is not in the appropriate range (6.0-6.8 for most tropical plants), then even when the soil nutrients are abundant, they will be insoluble and unavailable for the roots to absorb. Improper pH is a much more common problem than actual nutrient deficiency. This is particularly a problem if your local tap water is on the hard side.
Sorry for the lengthy reply, but I know that there is so much hype and misinformation about fertilizing that I have taken the opportunity to present this information.
