Pale, Blue
Flowers grown in a warehouse will be very pale. They never see the sun, so they don't grow to have bright colors.
Imagine walking into a warehouse and seeing hundreds of pale flowers growing in it. It's subtle, but beautiful.
そう
あお
None
When you grow pale flowers like this, they don't grow a soul (そう). Soul adds color to plants and flowers. That's probably why ghosts and dead bodies are pale too.
Picture a bunch of pale, soulless flowers. You pick one up and it falls apart in your hands.