The plant lives longer in cool climates. Propagation is by seed, division and cuttings. Softwood cuttings can be taken in spring. The plants will not divide well. The seed germinates in 2 to 3 weeks at temperatures between 70 and 80 degrees.
Darkness is necessary for germination.
Summer Skies' - Light blue flowers with a white bee, up to 6 feet tall. Willoway Nurseries 1999. This information is for educational purposes only. References to commercial products or trade names does not imply endorsement by MSU Extension or bias against those not mentioned. This information becomes public property upon publication and may be printed verbatim with credit to MSU Extension.