Perennial Sweet Peas

I have a few Lathyrus latifolius seeds to grow over an archway.
Can I put them in the ground now and 'leave them to it'?
I think they're fully hardy, so will they sort themselves out and appear when they're ready!?
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I'd recommend starting them in pots in a cold frame or a unheated greenhouse. i think we are going to get colder before spring. good luck post a pic once they are up

 

Hmm. I've got a perennial sweet pea which produces thousands of seeds every year, but the ground below is not riddled with seedlings. Suggests to me they might need a bit of cossetting, or else I've got a mule.

 

Hi Graham , I don`t know if know but the Lathyrus latifolius will take 2 years before flowering , they are different from the normal sweet pea, but well worth waiting as they will reshoot every year.

 

I had them also in Bucks and I agree with what Madahhlia says .. but once they are there .. they are there, also had them on the IoW, same scenario. Would actually like them here come to think of it but have never seen them only the tiny wild sweet peas.

 

I had to dig one up and move it once. It had the most massive, solid root, much bigger than I expected for a flimsy perennial. Has anyone else found this?

 

i found that their root just went on into the ground it moved ok but wow! what a root :D

 

Don't know about the root but i planted a white one a couple of years ago, it sailed through the minus 12 temps we had last winter so i can definately say they're hardy !!!
Mine grows with a rose and a clematis on a large obelisk.
I didn't remove any of the seedheads last year so i'll be interested to see if any babies pop up !