A trellis for growing flowers Hides in a small attic extension

I wear many layers but I’m not dressed for the cold. I’m round and I’m leafy, both humble and bold. I might roll in a patch or be chopped for a dish, From slaw to a stew, I grant cooks their wish.

I'm both a myth and actually exist. My mythical form is a king that can kill with one look. In real life, I'm quite badass too. I can run on water!

My heart's a grain of sand Covered by my mother When put on a strand I'm gift to one's dear lover

I am a blade, but I do not cut. I am shaved for sport and smoked by others.