ornamental

adjective

1. used or grown for ornament: ornamental plants.
2. providing ornament; decorative.
3. of or relating to ornament.

noun

4. something ornamental; decoration; adornment.
5. a plant cultivated for decorative purposes.

adjective

1. of value as an ornament; decorative
2. (of a plant) used to decorate houses, gardens, etc

noun

3. a plant cultivated for show or decoration

adj.1640s, partly formed in English from ornament (n.) + -al (1); partly from Latin ornamentalis, from ornamentum.