Building a rock garden will require you to have certain flowers like the Stemless Gentian. Although it's actually not a ‘requirement' but having them around will boost your garden's visual points. Stemless Gentian flowers are European native perennial plants that has trumpet-shaped blue flowers with green spots on the throat and elliptical deep green leaves. They have also received the Garden Merit award and is also a good choice for groundcovers and cottage gardens.

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Source: Gardenia.net