Starlord wrote:
I've planted Dahlias in clay soil and watched them turn to rot. I now
only use good potting/top soil.

I'll clarify by explaining that my parents' house is at 6,000 ft.
elevation. The soil there is little more than decomposed granite and
whatever amendments (if any) my father added to the soil. Houses in the
valley, along the Rio Grande, will have high clay content and would have
to treat their soil very differently, even though both soil types fall
within the same city limits.

FYI, the rule of thumb for pH in NM is 8.2, give or take 0.3.

--
Brett Woywood
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