Apparently the secret to Endless Summer is that it is a genetic freak
that acts like some hydrangeas that bloom on old wood and some other
hydrangeas that bloom on new wood. Hence, if you can keep the blossoms
on old wood going until the blossoms on new wood kick in then the effect
of constant bloom is better achieved. Deadheading never hurts as long
as you don't disturb buds of new blossoms. It would be nice if they
could do this with lace-cap hydrangeas also.
--
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Cheers, Steve Henning in Reading, PA USA Zone 6