Sacha wrote:

At a guess, rain, wind and cold, if you've been getting all those.
Magnolias don't like cold wind on the developing buds. Two years ago
we lost all the buds on our M. campbellii to frost.

What a shame! It's not exactly the magnolia most keen to get into flowering
mode, either. How many years have you had it?

--
Jeff
(cut "thetape" to reply)