Answer:

petunias

Answer	Crossword Clue
PETUNIAS	Funnel-shaped flowers
PETUNIAS	Summer annuals.
PETUNIAS	Easiest perennials to grow.

PETUNIAS	Funnel-shaped flowers.
PETUNIAS	Some of the nightshades
PETUNIAS	Garden ornamentals
PETUNIAS	Funnelform flora
PETUNIAS	Flowers that materialize above Magrathea, in "The Hitchhiker's Guide To The Galaxy"