Answer: If you deadhead your campanula you'll get more flowers over a longer period of time. If you leave the spent flowers on your plant it will spend its energy making seeds instead of making more flowers. So, simply pinch off the dead flowers, or snip off the flowering stems and your plant will produce more flowering stems from the base of the plant. You can either cut it off way down on the plant or just cut a few inches off the stem (it will produce two smaller lateral stems with flowers just below where you cut it).
In general, bellflowers grow best in full sunshine and appreciate a deep soaking each week during the growing season.
Best wishes with your bellflowers!
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