Tulsi, Tulasi, also known as Holy Basil (Ocimum sanctum).
tulasī-parikramā kara, tulasī-sevana
nirantara krsna-nāma kariha kīrtana
CC Madhya 24.261
(After planting tulasi before your house, you should daily circumambulate that tulasi plant, serve her by giving her water and other things, and chant the Hare Krsna maha-mantra.
Translated from the Chaitanya Charitamrita, Madhya-lila section, Chapter 24, Text 261)
