A very special devotee of Lord Krishna named Tulasi Devi has appeared in the form of plant so that we can get the special mercy of personally serving and worshipping her for attaining pure love of God. Therefore tulasi worship is a standard part of our daily morning devotional program. After rising early no later than 4am, attending mangala arati, and singing prayers to Lord Nrsimhadeva the devotees then worship this most sacred of all plants. Tulasi is so special that Krishna will not accept any offering of foodstuffs unless it is accompanied by a tulasi leaf.
The tulasi plant is of the topmost importance in the ultimate self realization process of devotional service and is thus described in the Skanda Purana as follows: "Let me offer my respectful obeisances unto the tulasi tree, which can immediately vanquish volumes of sinful activities. Simply by seeing or touching this tree one can become relieved from all distresses and diseases. Simply by offering obeisances to and pouring water on the tulasi tree, one can become freed from the fear of being sent to the court of Yamaraja [the King of death, who punishes the sinful]. If someone sows a tulasi tree somewhere, certainly he becomes devoted to Lord Krishna. And when the tulasi leaves are offered in devotion at the lotus feet of Krishna, there is the full development of love of Godhead."
One can sow a tulasi plant at home and worship her at home.
Sankarshan Das Adhikari