Symptoms
Signs of plants not receiving enough nutrition over time include lack of growth and lower production of flowers and fruit. You may also notice a loss of color in the leaves, which is a clear sign of nutrient deficiency.

Failure to Apply Fertilizer
Fertilizer provides plants with nutrients that may be lacking in the soil. However, missing one dose of fertilizer will not have any significant effect except to slow the plant’s growth a little. If you miss a dose, don’t panic, as this can be easily remedied.
Signs of plants not receiving enough nutrition over time include lack of growth and lower production of flowers and fruit. You may also notice a loss of color in the leaves, which is a clear sign of nutrient deficiency.
If you don’t see any visible signs of nutrient deficiency, such as discoloration of the leaves, just apply a normal dose of fertilizer straight away and then go back to the suggested fertilization schedule.
If there are symptoms of nutrient deficiency, you can add a little more fertilizer than usual this one time, but continue the suggested fertilization schedule afterward.