And now for the real gardener’s magic! When we say “a few drops,” most experienced gardeners immediately think of a certain bottle we usually keep in our medicine cabinet: iodine.

Iodine is like an energy boost for tomatoes. Although plants don’t need it in large quantities, it can work wonders in small doses.

Why iodine under the roots?

Accelerates flowering and ripening: Tomatoes produce fruit sooner, and the fruit becomes sweeter because iodine stimulates carbohydrate metabolism.

Protection against Phytophthora: Iodine is a powerful antiseptic. A few drops in the soil act like a shield against potato mildew, which can destroy a tomato harvest within a few days.

Increased resilience: The plant becomes more resistant to weather fluctuations.

Recipe for the “Miracle Watering”

If you want to see the difference, mix the following (but be careful with the dosage, iodine is strong!):

Add 3 to 4 drops of a standard 5% iodine solution from the pharmacy to 10 liters of water (ideally stale water or rainwater). Stir thoroughly.

Water each plant directly at the base (approx. 0.5 liters per tomato) after watering it with plain water. The soil must be moist so that the iodine doesn’t burn the sensitive roots.

Alternative “Secret Ingredient”: Ammonia (Salmiak)

If you didn’t mean iodine, your secret might be ammonia water (ammonia solution). It acts like a nitrogen bomb:

Dosage: 1 tablespoon per 10 liters of water.

Result: The leaves turn dark green, the stems become as thick as a finger, and the plant practically grows before your eyes.

A little tip (colleague advice): When it comes to these “miracle drops,” the golden rule is: less is more. Too much iodine or ammonia does the plant more harm than good. Tomatoes appreciate it, but they are sensitive to chemical substances, even those from the pharmacy.

Did my iodine recipe hit the mark, or do you have another trick up your sleeve—perhaps using yeast or hydrogen peroxide?