Question
QUESTION: I have three healthy plants that are in their second year. They are being crowded out by a hydrangea. When is the best time to transplant them. Their blooms are finished for this season.

ANSWER: Hi Carol,
Thanx for your question.  I would transplant them around the end of August or the first part of September.  A rule of thumb is to transplant when you have at least 30-45 days before the first frost.  I hope this helps.
Tom

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QUESTION: Should I cut the blue star sea holly way back before I transplant? And I understand that the root is very deep.

Thanks

Answer
Hi Carol,
Thanx for your question.  Yes, the blue star holly (eryngium) has a long tap root so dig as deep as you can to recover as much of it as possible.  I would cut the plant back to a manageable size but not all the way down to the ground or too short.  I hope this helps.
Tom