A. belladonna blooming project, and watering

Michael Mace michaelcmace@gmail.com
Sun, 14 Jun 2015 10:29:20 PDT
>So I wonder how A. belladonna responds to "full sun" sites with southern or
northern exposures, if there would be a difference in flowering time.

To add to the complexity, there are many well documented cases of A.
belladonna (and possibly the hybrids) blooming very vigorously after a fire
has cleared the overlying brush. Mary Sue posted some great photos of this
on the PBS Amaryllis page.

Based on what Nathan wrote about bud initiation happening three years before
blooming, that means it's routine for these plants to form buds, wait to see
if conditions seem optimal for blooming, and then abort the buds if they
don't get the right trigger(s). So when we fight to get these things to
bloom, we're not just trying to make the bulbs happy, we're trying to avoid
conditions that tell the bulb "this is one of the years when you should not
bother to bloom."
Some PBS members in Australia have said that the blooming trigger for them
is late summer thunderstorms. But that can't be the only trigger, as in most
of California we rarely get that sort of weather.

The whole thing is surprisingly complex, and I'm glad Nhu is keeping
records. At some point I hope we can collectively figure it all out...

San Jose, CA

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