I bring this up just to let you know that the color green (midori) is sometimes referred to as blue (ao) in Japan. I don't know why they do this. So midori has one extra syllable--is saying "ao" so much easier?
I remember a time as a child I was speaking to someone and the subject of traffic lights came up. I said "midori shingou" (green light) and I was told that it's NOT midori shingou but AO SHINGOU, even though the light is physically green like in the U.S. or anywhere else in the world.
The shredded green seaweed that's sprinkled on top of Tako yaki or Okonomi yaki is called "Ao nori" (blue seaweed). There are other examples.
However, if you picked up a cucumber and asked what color it was, kore ao desuka? You'd probably get a reply "Ahoka! Sorewa midori ya naika!"