The lower garden is much damper and takes a lot longer to warm up. I put the brassicas in this bed about three weeks ago and they've been slow to get going, although I have already started harvesting leaves from the Tuscan kale. There is a mulch of grass cuttings down on this bed but the weeds are starting to break through. The brassicas did really badly in the upper vegetable garden in last year's drought of a summer, so I'm hopeful they'll be better off down here.
The picture below is a key showing the locations of these four parts of the garden.