Richard Hawke is plant evaluation manager at the Chicago Botanic Garden , where he conducts long - terminal figure test on dozens of decorative plants . For the past   22 + years , he has assess more than 117 different campanulas in their comparative run .

Besides observing their ornamental traits , he regularly monitored the plants to see how well they get and accommodate to environmental and soil condition . He also keep a tightlipped eye on any disease or pestilence problems and evaluate flora hurt or losses over the wintertime .

You ’ll find Richard ’s top picks and   why he likes them in “ Campanulas you ca n’t live without ” in the   May / June   2014 issue   ofFine Gardening(#157 ) . We could n’t print the full results of his study in the magazine , but you could download the full listing of evaluated campanulashere .

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More than 40 bellflower were ineffective to be rated in the trial because they failed to survive more than two years . Here is the lean of those plants and a brief explanation of what led to their demise :

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