Stacking in the Garden

Hi permies,

This season I'm experimenting with stacking annual crops in my veggie garden, similar to how food forests utilize the various layers.

I'm going to grow climbing peas on tall trellises similar to this:


I'll plant the seeds less densely than what the packet recommends, with the idea that some sun will penetrate the canopy. The question is, what is a suitable crop that can grow in a shady place like inside the A frame?

I read that lettuce will do the job, but are there other alternatives? Spinach simply bolts here in the summer and I'm wondering if it might do better as an under-story crop. What about Bok Choi?

Suggestions much appreciated

Nick, I went over to youtube there is a guy that has some really great videos on vertical gardening and shade tolerant plants. Do a search on youtube.com for "one yard revolution", I would have included an url but my phone is being weird.
OneYardRevolution | Frugal & Sustainable Organic Gardening

see what I mean?

Edited by moderator to shorten link