"paghat" wrote in message
news
In article , "Boots"
wrote:



#2 reason for never blooming is their narrow environmental requirements
aren't met. They need very warm summers with lots & lots of sunlight, then
a good solid wintry winter for dormancy; they like rather northerly
climates with summer sun still shining at nine at night, followed short
winter days, like in central Europe or the Pacific Northwest.

I don't understand why short winter days would make any difference since
lilacs are deciduous.