Many Hindus have doubt as to which metal utensil should be preferred to pour water to Goddess Tulsi. Water to Tulsi should always be poured using a round vessel like the kumbha or lota. The metal preferred is copper or bronze or silver. The round vessel symbolizes Mother Earth and it also retains lot of positive energy. The water used should be clean.
Tulsi plant should be provided with dried cow dung every month for nutrition. Pouring diluted cow urine (1:10) ration is also good for Tulsi plant.
Some people light agarbatti and diya very close to Tulsi plant. This should not be done. The heat of diya and agarbatti should not touch the Tulsi plant.