Cosmos question

bellsrusOctober 12, 2010

Hi everyone -

I've read that there are both annual and perennial varieties of Cosmos. Could someone tell me how to figure out whether my Cosmos are annuals or perennials?



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aquawise(zone 4 Utah)

All the ones we grow here in zone 4 are annual. It could be determined by the zone you live in.

    Bookmark   October 12, 2010 at 10:18PM
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aachenelf z5 Mpls

You didn't tell us anything about the ones you grow, so it's kind of hard to tell you what you have. There are only a few perennial kinds one being Cosmos atrosanguineus (the Chocolate Cosmos) and it wouldn't be hardy in your zone anyway.

    Bookmark   October 13, 2010 at 4:59AM
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OK, thanks! Mine are variations of pinks and whites and are 3-4' tall.

    Bookmark   October 13, 2010 at 8:48AM
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Yours sounds like the annual variety but they self slow like crazy, at least here in central New Mexico. I originally planted them from seed 4 yrs ago and now have them every year. I let them go to seed every year in case birds eat the seeds so I have a ton of them.

    Bookmark   October 14, 2010 at 2:10PM
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aachenelf z5 Mpls

Yes they will self sow like crazy and I love that. I hadn't grown them in years, planted some a few years ago and every spring since I have tons of seedlings. It was fun rediscovering something so common yet so wonderful. Mine are still blooming and the finches love the seeds.

    Bookmark   October 14, 2010 at 3:08PM
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Thanks for the info on the self-seeding.

So, my husband wants to know whether he should pull them, or cut them back. If they are annuals, he should pull them, but wait as long as possible in the hopes they will self-seed?

Sorry to be so dense...I'm definitely a beginner gardener!

    Bookmark   October 14, 2010 at 3:29PM
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Not to worry... Google the images for cosmos seed head.

If you find the spikey seed heads, like those pictured, left over from the long ago spent flowers, you can pick them off and scatter the hard, brown, dart shaped seeds where you want them. You can also just cut the seed head off and drop the whole thing where you want. Or, save the seeds and plant in the spring. Then pull up the old plant since it's done for the season.

They do self seed here in cold zone 4 - not as reliably as in warmer spots, but I usually get a few that crop up in unexpected places.

    Bookmark   October 14, 2010 at 3:58PM
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aachenelf z5 Mpls

By now, your cosmos plants should have scattered plenty of seed for next year. When you pull up the dead plants this fall, you'll scatter even more seed in the process. I doubt you really have to worry much about finding the seed heads and scattering the seeds yourself.

    Bookmark   October 14, 2010 at 7:59PM
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Thanks for all the great information!

    Bookmark   October 14, 2010 at 9:17PM
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