I have Nellie Moser and a purple one, (no name) planted together on same trellis. Thinking I will dig Nellie Moser up and replant because it doesnt bloom much because the other one has taken over. Would it be better to do this in the Fall or Spring? Have had these for about 5 years, thought it might do better by itself. Thank-you for your help Tricia (There is enough space between them that I should beable to dig it up without hurting the other one.)