Happy Father's Day

In honor of Father's Day here are some photos of my dad working in his garden. It hasn't been that long since I helped plant it and I'm shocked at how fast everything came up!

The bean and corn seeds are already up and looking great. I'm jealous. I don't have any corn and my beans definitely don't look that good.
They're using straw as a mulch this year. One perk of container gardening on a 2nd floor balcony is a fairly distinct lack of weeds.

My mom was hoping I could ID this flower, but I'm not sure. It looks like a giant buttercup. Does anyone know what it is?