Description
The Missouri evening primrose is a tough beauty, with large yellow flowers from late spring to summer. In fact each flower blooms for only one day (late afternoon to next morning, night pollination) but the long blooming season makes up for it.
It is an excellent species for dry, poor substrates, gravelly or sandy soils. Give it space and it will form a nice mounding clump full of large yellow flowers throughout the summer.
I am happy to finally have seeds of this species, which is so useful for dry, difficult garden spots, in a large rockery or scree gardens (it forms long tap roots, not easy to transplant).
Still going around by the name O. missouriensis alluding to the native area, the specific epithet macrocarpa alludes to the large capsules (large fruited). It is good to be familiar with both.
Germination: a portion of seeds will germinate at warm but for best results use 1(2) months of cold/moist stratification (sow in early spring outdoors, or provide 1 month of cold/moist in the fridge and sow the seeds afterwards).
Update: the seeds definitely need a cold/moist stratification period for best results; one month in the fridge works fine.
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