Dan,

I welcome sharing thoughts with you regarding chemistry. My
background is more medical direction, but am always happy
to entertain chemistry discussions.

Warning: I am not plant expert. Soil chemistry seems to be
very well evolved science (many books), although, there is a lack
of basic instruments in most plant supply shops, such as
pH meters. They do not even sell litmus paper, usually. Following
the recent threads on tomatoes, which parallel my tomatillo
project, you would think soil pH meters would be more common
in plant shops. By comparison, plant shops have an endless supply
of thermometers, an item easily found pretty much everywhere.

I am curious, not being much of an expert in gardening, what
cool tricks gardeners have devised to measure soil pH? Dyes from
many flowers could be used, for instance.

Dominic-Luc Webb