If you don't cut them back, they will look very manky in a few weeks time.
He calls her the chocolate girl Cause he thinks she melts when he touches her She knows she's the chocolate girl Cause she's broken up and swallowed And wrapped in bits of silver
Love the dual shades of blue too. I have dual yellow ones. They spread by rhizome rather than seeds so I just cut the whole stem and hope the leaves give enough energy.
I remove the individual dead heads as they die and leave the stems to die off before removing them. In September I cut the foliage down to about 4/5 ins. with a diagonal cut, leaving a fan shaped stump.
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Cause he thinks she melts when he touches her
She knows she's the chocolate girl
Cause she's broken up and swallowed
And wrapped in bits of silver