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Achillea 'Coronation Gold'

I work at a medium size garden center that specializes in perennials in
Zone 5.  My professional background is P.E. teacher.  My hobby is
gardening.  I no longer teach and I have become extremly addicted to
plants, specifically growing.   However, I do not have any Hort education
and I am completely self- taught.  

Now that you know my background, my question relates to Achillea
'Coronation Gold'.  What is the most successful way to propagate this
plant? My success rate is poor.  I tried division mid-summer.  Plant
seems very woody and therefore much damage occurs during division.  I
tried stem cuttings, but we have no greenhouse facilities.  I use a shade
cloth tent for protection from the sun.  What size pot should be used? 
How far do you cut the plant back after the division?

One more question as long as I have you.  Perovskia...same questions. 
Remember we have no greenhouse!  Thanks.
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