For performing arcana, tulasī is required. The mantra for picking tulasī is:
tulasy-amṛta-janmāsi
sadā tvaṁ keśava-priye
keśavārthaṁ vicinomi
varadā bhava śobhane
“O Tulasi, you are born from nectar and always dear to Lord Kesava. Now, for the
service of Krsna, I am picking your leaves, O one who is shining brightly.”