The optimal growing conditions for the 2 plants are not the same. The geranium likes shade in the afternoon if temps are over 80 F. whereas lavender likes hot and dry conditions in full sun. Lavender needs fast-draining soil that is allowed to dry out between waterings and the geranium likes consistent moisture. In other words, I don't think this is a good pairing.
Answered on May 6, 2018
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