Ready to use. Helps correct calcium deficiencies. Also use on cucumbers, melons and peppers. Helpful Information: Tomato blossom-end rot is a disorder caused by calcium deficiency. The disorder can be aggravated by the application of too much nitrogen fertilizer to tomato plants. Blossom-end rot appears as a round, brown sunken area on the end of the tomato fruit opposite the stem. As a fruit ripens the area turns dry and leathery. The disorder often appears after a period of rapid growth followed by dry conditions, or in periods of heavy rain that caused calcium to leach from the soil. Foliar fertilization is intended as a supplement to a regular fertilization program and may not, by itself, provide all the nutrients normally required by crops or other intended plants.