Potassium permanganate has many uses: it comes in handy for disinfecting and treating seeds when growing flowers

Potassium permanganate is a common strong oxidizer. It looks like purple-black crystalline granules or powder, and when dissolved in water it turns a distinct purple-red. It is chemically active and readily reacts with organic matter, so it is often used as a disinfectant in agriculture and horticulture. It is cheap and easy to buy, making it a staple in many flower growers' homes.

For growing flowers, the most common use of potassium permanganate is seed soaking for disinfection. Before sowing, soak the seeds for a while in a diluted light purple solution to kill the pathogens carried on the seed surface and reduce disease during the seedling stage. Before potting, tuberous-rooted and bulbous flowers can also be soaked in a dilute solution to lower the chance of the bulbs or tubers rotting.

Besides treating seeds and bulbs, it can also be used to disinfect soil, flower pots and pruning tools. When repotting, watering once with a diluted solution helps reduce pathogens in the soil; disinfecting old pots and reused soil before use also lowers the risk of infecting the plants.

When using it, controlling the concentration is key. Generally, dilute the solution until it is pale pink or light purple. A concentration that is too high can easily scorch seedlings and roots. It is best to mix the solution fresh and use it right away; if left standing for a long time, the color fades and the disinfecting effect declines along with it.

One reminder: potassium permanganate is somewhat corrosive. When handling it, it is advisable to wear gloves, avoid direct contact with skin and eyes, and store it sealed and away from light, out of the reach of children.