Comment concerning Hyssop (Agastache 'Summer Sky'): Survived zone 5 w/no winter protection

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As a comment about Hyssop (Agastache 'Summer Sky'), Marilyn wrote:

Agastache 'Summer Sky' was introduced by Terra Nova Nurseries a few years ago.

This one is not as hardy as the other Agastaches they've introduced. It's only hardy to zone 7 according to their website.

Name: Toni
Denver Metro (Zone 5a)
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Skiekitty
Aug 23, 2013 9:16 AM CST
Thought for sure that this had died last year as, after I received it from a co-op, it died to the ground. Didn't pull the tags, didn't plant anything else in that spot. Around June 2013, saw some kind of agastache coming up in that spot. Waited until it bloomed before I could identify it. It's Summer Sky. Survived zone 5 w/no mulch or other winter protection. In a semi-shade spot. This plant grew to be about 16" this year and about 8" across. Not as "blue" as I was hoping, more of a muted purpley blue
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Name: Marilyn
Northern KY (Zone 6a)
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Marilyn
Aug 23, 2013 9:53 PM CST
That's wonderful, Toni! Hurray! Good to know! Thumbs up

Must be hardier than zone 7, even though Terra Nova lists it that way. I've never grown it before, but might be tempted next year. With all the new varieties Agastache varieties available every year, I been passing it up.
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