Fritillaria imperialis and persica help
Rodger Whitlock (Fri, 06 Jun 2014 09:35:41 PDT)

On 5 Jun 2014, at 22:11, J. Agoston wrote:

A professional horticulturist once told me that F. imperialis needs extra
potassium.

But before doing that, I would find climatic records for your location and for
a location where F. i. is known to thrive - probably in Iran - and compare the
two. It may be that the pattern of weather with you differs too much from that
in F.i.'s native haunts.

I have a problem that is analogous: Japanese plants fail in my garden because
(I believe) the annual pattern of rainfall is exactly opposite from that in
Japan. We have dry summers and wet winters, the winter wet aggravated by poor
subsurface drainage in my garden. Japan has wet summers and dry winters. If a
Japanese native doesn't desiccate to nothingness in summer, it rots away during
the winter. Such plants can be grown in pots if you remember to store them
under cover during the winter.
--
Rodger Whitlock
Victoria, British Columbia, Canada
Z. 7-8, cool Mediterranean climate