Here's why:
* The vowel sound in "artichoke" is a short "o" sound. It's similar to the "o" sound in words like "hot" or "cot".
* Long vowel sounds are usually associated with a vowel that is followed by a consonant and then a silent "e" at the end of the word. This is not the case with "artichoke".
Therefore, "artichoke" has a short vowel sound.