Bolivia: Walipinis, underground greenhouses

English horticulture trade reprint of the Bolivian walipini story: Peter Iselli origin, Héctor Vélez/Gemio rescue, Aymara "very good/very well," and labor/water cost caveats. Aymara name glossed as "very good or very well". Credits Swiss cooperator Peter Iselli ~25 years earlier; abandoned then rescued by Héctor Vélez with Gemio family financing for 17 years. Cites BBC that walipinis are cheaper and more effective than conventional greenhouses for the setting. Notes main initial investment is labor to dig the hole; not a magic solution despite low materials spend.

Evidence tier: news. Trade reprint of Spanish journalism; limited independent reporting.

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