The plants are over fertilized, and the rich solution in the soil is retaining the water. This is not allowing the plants to draw the water from the soil. In addition, some bloom fertilizers are very acidic and lock up other nutrients so they are unavailable to plants.
Stop fertilizing and rinse out the planting medium using room temperature water. Many of the excess nutrients will dissolve in the water and be carried outside the container. Once the plants have recovered, start fertilizing again, using moderation. Make sure to use a more balanced fertilizer. Flowering formula fertilizers with high phosphorous are acidic. A balanced flowering formula uses potassium to balance the acidity.
All fertilizers list their nitrogen (N), phosphorous (P) and potassium (K) formulas in that order, as N-P-K. A typical balanced formula is 2-10-10. That signifies that the fertilizer contains 2% nitrogen, 10% phosphate, and 10% potash (a form of potassium).
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