For performing sacrificial ceremonies, one requires sacrificial ingredients, such as flowers, leaves and straw, along with the sacrificial altar and a suitable time [spring].
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
वस्तून्योषधयः स्नेहा रसलोहमृदो जलम् । ऋचो यजूंषि सामानि चातुर्होत्रं च सत्तम
vastūnyoṣadhayaḥ snehā rasalohamṛdo jalam | ṛco yajūṃṣi sāmāni cāturhotraṃ ca sattama
SB 2.6.24