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I don't understand plants; healthy annuals died but seedlings ok

16 years ago

I sowed wild cosmos on the hillside in early September. They have been beautifully flowing. I sowed some more later in October to patch some spots. The seedlings have not grown as fast as the first batch, for the temp has been getting slightly cooler. There was light frost here in GA two days in a roll. All the beautifully flowered cosmos are all withered, even those strong ones only starting to bear buds. The second batch of the cosmos now still just about one inch tall is ok after the frost. I don't understand why... Supposedly, the healthy grown-up annuals should be stronger and more tolerable, whereas seedlings are fragile and die easily. Any explanation? Thanks

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