It's true! I have heard of this, it is a very sacred plant that can only be grown for 3 months out of the year, otherwise, it shall die.

It must also be planted in soil that is dosed with holy water for 10 fortnights. After these 10 fortnights the soil must be planted into the earth in which the area of the plant shall be planted. The seeds must be handled by someone pure of heart otherwise they will be infertile and produce regular weed.

Then, on the sixth week of growth, you must chant a spell.

A LALALALALALALA
A LALALALALALALA
A LALALALALALALA
And you shall have the almighty sacred plant.