Since then Bhagvaan's Bhog always contains a piece of Tulasee leaf.

Nobody grows Tulasee from seed, because it is believed that if you grow Tulasee from seed, you should marry her. This marriage is performed like any other marriage performed in Hindu society. Her husband is Shaaligraam Jee. That is why people normally bring a small plant from somewhere (from somebody's house or temple) and plant it at their place. Tulasee, planted in this way, need not be married. Nobody refuses to give Tulasee plant to anyone. 

Besides, nobody plants Tulasee inside the house. It is normally planted in courtyards of houses, but is worshipped normally two times a day - morning and evening. In the Kaartik month it has a special importance. Family women get up early in the morning (an hour before sunrise), take bath and worship Tulasee Jee. They normally do it in groups. They tell some stories also sitting around Tulasee plant.