Likewise, a newly potted plant needs time in which to grow new roots to absorb the fertilizer you will be applying. Approximately half the recommended strength means using only half as much fertilizer per plant or in solution. Annual plants grow very quickly and need fertilizing every two or three weeks during their short season. Some flowering plants, like Azalea, should not be fed at all while they are in flower. For annuals and other garden plants growing in hanging baskets, an outdoor fertilizer is fine.
Soluble compounds are easy to apply and provide quicker results than solids or slow release pellets.
Simply apply the fertilizer solution in place of water when you would normally be watering the plants. Use all fertilizers at or weaker than the recommended strength of dilution, never stronger. Newly rooted cuttings, seedlings, and young plants will benefit from weaker solutions to avoid damage to the soft young roots. Fertilizers for foliage and flowering plants.