Another Stipa question; stratifying seeds in the fridge/freezer
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From: "Chris Hogg" Newsgroups: uk.rec.gardening Sent: Thursday, July 28, 2011 3:58 PM Subject: Another Stipa question: stratifying seeds in the fridge/freezer I want to sow some of my Stipa pulcherrima seeds (see earlier post). I know from past experience that if sown now, they won't germinate until next spring, implying they need a cold spell to trigger the process, i.e. stratification. I would like to speed it up, and intend putting the potted seed into either the fridge at say +4 deg. c. or in the freezer at -18 deg. c., probably both as I have quite a lot of seed. But does anyone know which is most likely to be successful, and how long should I leave them in there? I stratify a number of wildflower species and find that alternating them (i.e. a couple of days in the freezer then three or four days in the fridge) for a period of 6 weeks is the best method. Some species e.g. Primula scotica usually respond within 3 weeks, whereas Primula veris and P. vulgaris will give partial germination. These seeds should be given another stratification treatment once any seedlings have been pricked out. HTH Phil |
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