Calochortus kennedyi
Paul Cumbleton via pbs (Sat, 26 Oct 2019 09:07:17 PDT)

Jim,

I grew Calochortus kennedyi here in the U.K. and managed to flower it for
several years in a row, both in the orange and yellow forms. This was while
I worked at Wisley Garden. I grew the bulbs in deep clay pots plunged in a
sand plunge. The growing medium was pure Seramis - an expanded clay
aggregate in which they seemed very happy. The plunge was inside a large but
unheated poly tunnel that had a retractable roof which we kept open except
for when it rained . I watered them from early November until signs of
dormancy in late Spring and fed them regularly with a high-potash fertiliser
while in growth (Seramis contains no nutrients of its own). They got maximum
sunlight and ventilation at all times and dormancy was warm and completely
dry.

Hope this helps a little

Paul Cumbleton

U.K.

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