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Hardiness: USDA Zone 3a: to -39.9 °C (-40 °F) USDA Zone 3b: to -37.2 °C (-35 °F) USDA Zone 4a: to -34.4 °C (-30 °F) USDA Zone 4b: to -31.6 °C (-25 °F) USDA Zone 5a: to -28.8 °C (-20 °F) USDA Zone 5b: to -26.1 °C (-15 °F) USDA Zone 6a: to -23.3 °C (-10 °F) USDA Zone 6b: to -20.5 °C (-5 °F) USDA Zone 7a: to -17.7 °C (0 °F) USDA Zone 7b: to -14.9 °C (5 °F)
On Jun 8, 2008, stormyla from Norristown, PA (Zone 6b) wrote:
I planted 3 of these two years ago between red Double Knockout Roses. What a startling display!!!! I never dead headed them before, but i'll try it this summer. Until this year I felt they were ho hum. Now that they are large and full of blooms as are the roses, I want more!!!!!
On Mar 7, 2007, Bellisgirl from Spokane, WA wrote:
I really love this plant! Ive had it for over four years now. It is in an area that is particulary tough and droughty; it does not have any problems with it. Mine blooms through the summer since I deadhead it often. It does reseed a lot, but should not be considered invasive since the seedlings are so easy to just pull up.
Sow seed in a baggy at 70*F. Approximately 34% of the seed could germinate between 7 - 11 days. This seed needs light in order to germinate.
In the baggy method, a relatively sturdy paper like coffee filter paper is moistened and then wrung until barely damp.
Place the seed in the center of the barely damp filter and pull 1/3 up over the seed, then the top 1/3 down over the seed and then fold the ends over the center. Place that arrangement along with a water-proof label (that can continue to be used later) inside a baggy and transplant as soon as they germinate. Some gardeners hang the baggies vertically.
To keep the filter paper from drying out, it may be necessary to occassionally spritz it from time to time with just enough spray of water to dampen it. Don't let germinating roots go too long before potting up or they may get tangled up in the filter paper.
We have enjoyed growing the blue form of C. persicifolia among the low-growing, pale apricot-yellow rose 'English Garden' in the past, and now a DG trader has shared seed of the white form and I can't wait to see its bells coming up behind candytuft over a wall, under the rose 'Cornelia'.
On Dec 31, 2004, smiln32 from Oklahoma City, OK (Zone 7a) wrote:
Prefers a moderately rich soil that is moist and well drained. Fairly easy to maintain, though. Plant in sun but away from strong winds. Divide every 2- to 3-years. Spreads rather quickly. Great for rock and cottage gardens.
On Dec 23, 2004, kniphofia from Ashington United Kingdom (Zone 8a) wrote:
One of my favorite summer perennials. When regularly deadheaded this has a very long flowering season and it blends very well with other plants. It makes a nice cut flower too and is trouble free.
This plant has been said to grow in the following regions:
Bear Creek, Alaska Juneau, Alaska Park City, Illinois Woodridge, Illinois Fayette, Iowa Cornville, Maine Lexington, Massachusetts Blissfield, Michigan Mill City, Oregon East Norriton, Pennsylvania Havertown, Pennsylvania Issaquah, Washington Kalama, Washington Town And Country, Washington Ellsworth, Wisconsin