Posted: 21/09/2013 at 23:11
It depends on the size of the plugs. Anything that has roots filling a 7cm pot should be large enough to grow well in the spring, and then flower. The larger the plant is now, the bigger the flower spike next year.
I had some tiny plugs (seedlings)of foxglove dalmation peach delivered last march, I potted them into 7cm pots and thenplanted them out. They started to flower July , were deadheaded and are still flowering.