Fertilizers for potted flowers vary in nutrient balance and release rate, so the label matters more than a homemade ingredient list. Match the product to the plant and growing medium, and avoid adding raw waste to a pot.
Read the product label
A fertilizer for potted flowers should state its nutrient content and application rate. Soluble feeds and slow-release products work differently, so a spoonful of one cannot be substituted for a spoonful of another. Check whether the potting compost already contains fertilizer.
Organic does not mean ready for a pot
Prepared organic fertilizers are not the same as raw kitchen scraps, manure or other unfinished waste. Processing and formulation affect how a product behaves around roots. Use a product intended for the job rather than burying raw material in a small container.
Feed according to growth
Consider the plant, its active growing period and the volume of growing medium. More fertilizer will not repair roots damaged by waterlogging or compensate for unsuitable light. If a plant is declining, inspect those conditions before adding feed. Keep notes on applications and avoid combining several products whose total nutrient dose is unclear.
Related reading: What Is Organic Fertilizer? Materials and Practical Use.