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Sow in spring, to improve germination lightly sandpaper the seeds and then soak in warm water for 24 hours. Sow 2-5 mm deep, ideal temp 26 degrees, germination can take anywhere from 2 - 12 weeks, they have been known to take upto 40 weeks so be patient, still time to sow simply overwinter if need be in a greenhouse, conservatory etc
Cortaderia are robust evergreen grasses forming large, compact tufts of narrowly linear, rough-edged leaves, with erect stems bearing dense silvery or pink-tinged flower panicles which are excellent for drying.
A perennial, evergreen grass forming compact clumps of sharp-edged, narrow arching leaves, to 1m in length. Silky plumes of flowers on stems to 1.5m
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