In ragu dasa mercury bhukti is the fourth bhukti. According to virutcha shastra, one has to plant ilanthai maram (Ziziphus jujuba) to avoid the ill effects of ragu. It is called இலந்தை மரம் in tamil.
one day before the day of plantation, little bit of horse gram should be immersed in water. The plant should be planted on the morning of first wednesday of ragu dasa mercury bhukti period in public places,river edges and garden.After plantation horse gram water should be given to the plant. The horse gram should be given to cows and birds.