Sunflowers. From Mystic Medusa

Rape flowers

Rape flowers may help absorb cesium. From wallpaperpimper

After the 1986 Chernobyl nuclear disaster, sunflowers and rape blossoms were used to decontaminate soil in Ukraine. Radioactive cesium is similar to kalium, a commonly used fertilizer. If kalium is not present, sunflowers will absorb cesium instead.

If the harvested sunflowers are disposed of by burning them, radioactive cesium could be dispersed through smoke, which is why the researchers are considering using hyperthermophilic aerobic bacteria–used to produce compost–to decompose the plants. The decomposing process will reduce the sunflowers to about 1 percent of their previous volume, which will slash the amount of radioactive waste that needs to be dealt with

via Sunflowers to clean up radioactive soil : National : DAILY YOMIURI ONLINE (The Daily Yomiuri).