Polemonium boreale 'Heavenly Habit'

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Compact spikes of deep sky-blue flowers appear from late spring to midsummer (and sometimes later) above lush hummocks of handsome ferny leaves. This outstanding, long-blooming Jacob's ladder thrives in well-drained, humus-rich soil in full to part sun. Propagated from seed. Zone 3. Deep 3.5-inch pots. : Meneerke bloem, licensed under CC BY-SA 3.0