I’m paired with nuts. If my shaft is long, I can screw quote deep. Threaded for your pleasure.

In the kitchen, it stands with grace, A gleaming pot o' gold in its place. Water does flow, Down it must go, 'Neath a rainbow's bridge in haste.

I can be many shapes at once, yet I’m treated as a single thing. You hand me over before you ever see your seat. Machines weigh me, tags rename me, and belts return me. I travel where you travel, but never by your side. You watch a crowd of items pass, waiting for the moment you recognize all of me together. What am I?

People have me over, But dogs have me under. Walls wear me, As do many vehicles.

It grows in a bunch, Can be purple, red, or green for your lunch. Smush it and wait And sip something great.