What are wild sweetpeas?
Do you mean the perennials (not scented ) ?
You can do them 2 ways.............Autumn or Spring.
Personally, I would sow them now. They will germinate fairly quickly but you will need to grow them on ( deep narrow pots are best to accommodate the long root ) and then plant out next year.
It might be helpful to check out David K's thread on Sweet Peas.......I'm thinking the basics are the same. I don't currently grow Sweet Peas but do have the everlasting.
Hope this gives you a start anyway......IMO they are useful plants to have around
I have just waged war this summer on a border of perennial sweet peas. They were starting to come up everywhere and didn't do anything for me - untidy plant with no smell. So on with the weedkiller and out they came. I am sure they will get their own back next year when they will start coming up again in my newly planted border ! Just when I think I have won the war!
I dont think they care what you do with them, my daughter has just sent me a photo of hers, one plant, 8' by 6' thats just one seed!