The tulsi plant is also called Holy Basil in English. Its scientific name is Ocimum Sanctum.
For Indians it is one of the most sacred plants. In fact it is known to be the only thing used in worship, which, once used, can be washed and reused in pooja - as it is regarded so self- purifying. Also that all offerings would be incomplete without the tulsi leaf - hence the worship of tulsi.
She also symbolises Goddess Lakshmi, the consort of Lord Vishnu. Those who wish to be righteous and have a happy family life worship the tulsi.
The tulsi leaf has great medicinal value and is used to cure various ailments, including the common cold.
I also heard that the tulsi gives more oxygen in the day and very less CO2.
My grandmother told me about this.
I just planted a tulsi bush in my home.