I've never dead-headed and we get many blooms. My main concern is
finding varieties with upward/outward facing blooms. Ours are about
thirty years old. No problems but once one was attacked by ants below
ground level and a couple of times we had a red spot leave illness
appear. Used a systemic for the first time.
I always wanted to see if a self seeding was possible. Mine are all
grafted. Makes me think of my sterile Koi.
S Jersey USA Zone 5 Shade
http://www.ocutech.com/ High tech Vison aid
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