My own observations. which are suspect because they're about 60-70 years old from mjy childhood are that blooming is effected by heavy latge winter and early spring growth--followed by a dry and hot period. Then they always bloom. ----- Original Message ----- From: "Michael Mace" <mikemace@att.net> To: <pbs@lists.ibiblio.org> Sent: Tuesday, August 25, 2009 1:10 AM Subject: [pbs] What makes Amaryllis hybrids bloom? > Folks, > >From time to time we've had discussions about what drives the difference > between a good bloom year and a bad bloom year for Amaryllis belladonna > and > its hybrids. Many of us in California and other Mediterranean-climate > areas >