Thx much for all the valuable and insightful info. Who'd've thought it could be so complicated? But reasonable. The cemetery plot is small (only 8 graves there), so not too terrible for working, but ... still, effort.
Yesterday I drove there and did what I could do -- added lime, leaves, fertilizer, pond water (from my backyard pond; I figured it would have some goods that might be useful) and clay (mostly, just enough to hold the leaves down. Chopping into the hard soil ain't in the cards for me these days). Not the kind of superficial effort I'd've made back-when, but something. I'll keep adding to the area over time, as I have some the past 2 years. Better than nothing ....