Alfalfa is a short green bushy plant, maybe knee-high. When it blooms, the flowers are a deep purple. If you're looking at it from a distance you can't see the flowers; it just looks like a rich green field. You have to get closer to see the purple tops.
Picture a big green field spread out in front of you, lush and thick, with popcorn popping above it! It's a funny sight! It looks like popcorn, but really, it's hundreds of white butterflies, dancing as they pollinate. Watching them is like watching a fire; you could just stare and stare and lose all track of time.
Horses love fresh alfalfa. We used to have a fence lining our property, and the other side had horses. I'd go outside seeking quiet, and I'd approach the fence. This one horse would see me and silently make his way to our usual spot. He was tan with a black mane and tail, and he knew what I was there for. He knew I would give him a treat. I'd pick bunches of alfalfa (this was before my parents landscaped) and rub his nose as he chomped away. Have you ever had a horse look you in the eyes like he knew you? Like he and you were connected? It's amazing.
Anyway, back to alfalfa. So then the farmer comes and harvests the crop, leaving it in cut pile lines. After it dries, a baler comes and bales it. And then it's hay. Weird, huh?