Apply no fertilizer later than August. Stake the spikes before the flowers open to prevent injury while the spikes are elongating. A check in growth, early in the season, causes widely spaced florets on the spikes. Winter protection is suggested. 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.