Overwintering self sown seedlings

Need to know the best time to plant?

Moderators: Chantal, Tigger, KG Steve, peter

User avatar
Primrose
KG Regular
Posts: 5970
Joined: Tue Aug 29, 2006 8:50 pm
Location: Bucks.
x 571

Overwintering self sown seedlings

Postby Primrose » Sun Sep 30, 2018 11:33 am

Have noticed a lot of tiny self sown seedlings from my Cosmos flowers appearing in my border, probably due to the late sunshine.
Is there any point in me trying to overwinter them in my plastic greenhouse or would I simply be wasting my time?
0 x
User avatar
Diane
KG Regular
Posts: 1385
Joined: Fri Nov 25, 2005 3:08 pm
Location: Wimborne, Dorset.
x 217

Re: Overwintering self sown seedlings

Postby Diane » Sun Sep 30, 2018 1:23 pm

I think I would, just to see if they survive. Although I keep reading about the ghastly cold winter that is threatening to arrive so unless your greenhouse is heated, they're probably doomed. I always try to save seedlings as i feel too guilty to just chuck them in the compost. I often see tomato seedlings appearing in my greenhouse in the autumn and they're still there in the spring, even though my greenhouse has a cracked window pane which lets the draught in and is unheated.
0 x
'Preserve wildlife - pickle a rat'
Monika
KG Regular
Posts: 3740
Joined: Thu Jul 06, 2006 8:13 pm
Location: Yorkshire Dales
x 281

Re: Overwintering self sown seedlings

Postby Monika » Sun Sep 30, 2018 9:37 pm

Give it a try, Primrose, after all you have not lost anything if they don't survive. I have just potter up a whole lot of calendula and cerinthe seedlings for the same reason.
0 x
sally wright
KG Regular
Posts: 571
Joined: Tue Nov 29, 2005 7:32 pm
Location: Cambridge
x 72

Re: Overwintering self sown seedlings

Postby sally wright » Mon Oct 01, 2018 3:10 am

Dear Primrose,
Cosmos are half hardy annuals; this means that they will not generally stand frost or temperatures below about 5C. Calendula and Cerinthe are hardy annuals and will stand some frost and often overwinter without protection (but are best potted and tucked into a cold frame).

Keeping Cosmos overwinter will involve a lot of pinching to stop them becoming leggy and under cover in low light levels they are prone to mildew. Where there are some sprouting now there will probably be more seeds waiting for next spring and I would just give the area a light mulch to hide the seeds and hope for great things next spring.

Regards Sally Wright
1 x
User avatar
SweetLJ
KG Regular
Posts: 1
Joined: Tue Oct 09, 2018 10:03 am
x 1

Re: Overwintering self sown seedlings

Postby SweetLJ » Tue Oct 09, 2018 10:09 am

Cosmos are tender annuals, and will quickly turn brown when temperatures drop below freezing.
1 x
Gerry
KG Regular
Posts: 406
Joined: Fri Mar 17, 2006 11:55 pm
Location: West Cork,
x 33

Re: Overwintering self sown seedlings

Postby Gerry » Tue Oct 09, 2018 11:20 pm

Sally Wright, what were you doing up at 3.10am?
0 x
User avatar
Geoff
KG Regular
Posts: 4477
Joined: Thu Nov 24, 2005 5:33 pm
Location: Forest of Bowland
x 340

Re: Overwintering self sown seedlings

Postby Geoff » Wed Oct 10, 2018 7:59 am

We've got cerinthe seedlings coming up all over the rockery about 10 yards from the plants, I think something must like the big seeds and has been hiding them away.
0 x
User avatar
Diane
KG Regular
Posts: 1385
Joined: Fri Nov 25, 2005 3:08 pm
Location: Wimborne, Dorset.
x 217

Re: Overwintering self sown seedlings

Postby Diane » Wed Oct 10, 2018 10:21 am

Cerinthe seed themselves exceedingly well - I have them coming up in my lawn - in little cracks in the paving and other peculiar places. I don't know why they're so expensive to buy in seed packets - they grow like weeds in my garden (beautiful weeds though). The bees love them and I try to transplant the naughty ones to more suitable places.
0 x
'Preserve wildlife - pickle a rat'
Monika
KG Regular
Posts: 3740
Joined: Thu Jul 06, 2006 8:13 pm
Location: Yorkshire Dales
x 281

Re: Overwintering self sown seedlings

Postby Monika » Wed Oct 10, 2018 7:03 pm

It's like Mexican fleabane (Erigeron karvinskianus), isn't it? A pot of these costs at least a fiver whereas they seed themselves all over the place, especially in any paving cracks and gravel. And they are completely hardy.
1 x
Sally L Wright
x 1

Re: Overwintering self sown seedlings

Postby Sally L Wright » Sat Oct 27, 2018 12:36 am

Dear Gerry,
I couldn't sleep; simple as that.
regards Sally Wright.
0 x
User avatar
peter
KG Regular
Posts: 5366
Joined: Fri Nov 25, 2005 1:54 pm
Location: Near Stansted airport
x 188
Contact:

Re: Overwintering self sown seedlings

Postby peter » Sat Oct 27, 2018 7:12 pm

Sally, have you had OF issues?
You now have two logins to KG?
0 x
Do not put off thanking people when they have helped you, as they may not be there to thank later.

I support http://www.hearingdogs.org.uk/

Return to “Seasonal tips”

Who is online

Users browsing this forum: No registered users and 5 guests