By Artichoke
Kent,
United Kingdom 
Could you please let me know why my Perovska "Blue Spire", is going yellow once it has flowered.?
On plant
Perovskia
11 Jul, 2010
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The 2 reasons that I have come across for this is a. Clay soil which is too alkaline and b. waterlogging of the soil which causes root rot.
12 Jul, 2010