A news item from Cattle Point / Oak Bay BC (Victoria BC) I wonder how the torch treatment does NOT harm the camas native plants Oak Bay torching invasive burweed at Cattle Point - Victoria News
What people will do to remove weeds !!! Only a surface treatment though. The deep roots of other native plants remain unaffected. I believe that's the answer to your question Georgia.
Yes, camas bulbs are deep. Something like the meadowfoam, though, I can't imagine being too deep-rooted (perhaps I'm wrong). But it looks like the fire treatment occurs during the offseason so as not to interfere.