Spider plant is an African perennial widely grown as a houseplant in the United States. Its long stems bear small white flowers and young plants that hang over the sides of a pot, while its narrow leaves may be green or striped with white.
Bichetii grass stays in a compact clump and does not hang young plants on long stems. Spider plant often has long arching stems with small plants at their ends.
Why they get mixed upBoth can have narrow green-and-white leaves.