No.8 - I-Spy in the Garden Alphabet Game

only old xmas trees, largest is very big now may be 70+ feet.
reading the dictionary (as I do regularly) other words could apply:
xero: dry - which is root of xeranthemum; annual with everlasting flowers, good for drying?
xystus:  garden walk or terrace

but the dictionary is from 1964, don't know if words can go out of date as I doubt they are in general use. I've not heard of anyone taking a walk in (on/up/down?) their xystus..