The best times to plant perennials are spring and fall after the worst heat of the summer is past. It is very difficult for plants to establish successfully during summer. If you plant this fall, make sure to water all the way into winter so the roots are well-hydrated and more likely to survive. Galium odoratum likes shade and moist soil and is capable of spreading widely, some might say aggressively, where conditions are good. In this respect it is like lily of the valley. However, it is a pretty plant and the floral smell is heavenly.
Answered on July 8, 2018
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