raised bed questions

raised bed questions

I have an area of my driveway that I'd like to use for gardening. However, right now it's hard-packed gravel. Weeds do pretty darn good at growing there, and it drains, so it's not like it's cement. I want to put some raised beds there, about a food deep. What I'm trying to figure out is, do I need to get the gravel taken up and replaced with topsoil (something I've already gotten an estimate for and it's not too bad), or will my veggies do fine if I just put the raised beds right on top of the gravel?
Yay

Yay

Terrace update

Terrace update

Heirloom Roses

Heirloom Roses

Full garden

Full garden

flower pressing

flower pressing

Plant identity question

Plant identity question