Red Valerian

Martinsburg, PA

How big a container would I need to grow red valerian? I have a sunny location and have only grown annuals in these 15"x 15" '15" containers.

Prairieville, LA(Zone 9a)

From what I read, those should be adequate in size. Here is some info for you.

http://www.thegardenhelper.com/jupiters_beard.html

http://www.perennialresource.com/plants/general-perennial/159_centranthus-ruber-coccineus.aspx

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