Quote:
Originally Posted by Ron61
Even the star thistle isn't doing well it is so hot.
Ron 
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Really bad news about your thistle.
With all the time and expense you have in it,don't give up yet.
The following is what I use on my irrigated land.I think
this just may be the ticket for you too.
http://www.zimmatic.com/zim_agsysystem_cntrpiv.asp