Celosia - Cock Spin; Plants of the genus Celosia and Amaranth like to grow in ordinary real soils in bshes and pots. It is easy to grow and does not require any care. But the use of soils sold in bags can cause root decay. The rooster is a flower that loves the sun. It is not cold-resistant. Simply water the soil slightly to the bottom of each flower. Excess water can dry out and cause illness.