Cactus adjectives are listed in this post. Each word below can often be found in front of the noun cactus in the same sentence. This reference page can help answer the question what are some adjectives commonly used for describing CACTUS.
giant, large
nopal, pear
prickly, saguaro
small, thorny
Hope this word list had the adjective used with cactus you were looking for. Additional describing words / adjectives that describe / adjectives of various nouns can be found in the other pages on this website.
sharp
sharp
prickly
spikey
green