General Plant Information (Edit)
Plant Habit: Herb/Forb
Life cycle: Perennial
Sun Requirements: Full Sun
Full Sun to Partial Shade
Minimum cold hardiness: Zone 2 -45.6 °C (-50 °F) to -42.8 °C (-45°F)
Maximum recommended zone: Zone 8b
Plant Height: 8 - 15 inches
Plant Spread: 12 - 15 inches
Leaves: Fragrant
Flowers: Showy
Flower Color: Blue
Bloom Size: Under 1"
Flower Time: Summer
Late summer or early fall
Suitable Locations: Xeriscapic
Uses: Culinary Herb
Salad greens
Cut Flower
Will Naturalize
Wildlife Attractant: Bees
Propagation: Other methods: Division
Containers: Suitable in 1 gallon
Suitable in 3 gallon or larger

Image
Common names
  • Northern Dragonhead
  • Siberian Dragon's Head

Photo Gallery
Location: St Louis - MoBOT
Location: My garden, Calgary, Alberta, Canada; zone 3.
Date: 2012-12-04
Location: DePaul's Urban Farm, Vienna, VA
Date: June 2019
#pollination with bumble bee
Location: My garden in Belgium
Date: 2012-08-26
Comments:
  • Posted by critterologist (Frederick, MD - Zone 6b) on Oct 19, 2018 8:34 AM concerning plant:
    I just purchased this from a local nursery. The cultivar name on the tag is 'Blue Dragon', but since they also printed the species name as D. ruyschianUM, I wonder if they could have 'Blue Dragon' (a cultivar of a different species of Dragonhead, listed in this database) confused with 'Blue Moon' (a listed cultivar of this species).

    At any rate, the foliage is low growing, with small rosettes of leaves arising from long stems or stolons. To me, it looks like a similar habit to a low-growing sedum or to carpet phlox. From what I can see, with the stems and leaves extending several inches beyond the rim of the gallon nursery pot, I would call it "mat forming." Time will tell how far/quickly it spreads.

    There were several dried, papery seedpods in clusters at the ends of some of the stems when I purchased the plant (in October). I got at most one small (1mm?), hard, not quite round seed from each pod, although it's possible additional seeds had already been dropped.
Plant Events from our members
KelliW On February 3, 2019 Seeds sown
#30, winter sown seeds from ishareflowers
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