Cobaea scandens, what am I doing wrong?

This is the second year I've tried this plant with no success
Fresh seed and compost, in a heated prop and some on a sunny window. Compost just damp, I know they tend to rot, but however I try these seeds they just won't grow
Has anyone had success with these seeds? Please tell me how you did it

 

I have never grown them personally, but i understand you cover pots with plastic or cling film and water them from the base of the pot. The plastic/cling film helps retain moisture.

 

Thanks, did all that it just seems one of those plants I'm not destined to grow I love the look of them though

 

I grew Cobea , cup and saucer vine in 2014 . I soaked the seed before sowing. Planted them in seed compost. The seeds need to be planted on their edge and just barely covered . Place on a heated prop. Seeds germinated in 2 to 3 weeks , only got 2 out of 15 seeds.

 

Thanks @HarryS , I did that too maybe they are just awkward I hate being defeated though
I don't think I'm a competitive person but when it comes to seeds........ I will find a way....ok, maybe I won't
But it becomes a challenge

 

Why should this surprise me?

 

I am sooo not jealous @shiney

 

Is yours growing as a perennial @shiney? If it is the South of England has got a lot warmer than when I lived in that neck of the woods. I've grown it but only as an annual and yup had trouble with germination. Looks like our shiney is able to take a bow, yet again

 

How I do it is to soak the seed for 24/48 hours and sow in bags in slightly damp vermiculite placed on a warm windowsill. Germination usually starts in three or four days up to a maximum of about 50% success.
Cobaea seeds, like Tropaeolum peregrinum seeds, are fussy so what works for me may not work for you! Once you find the method that works in your house stick with it and you'll wonder why it was ever difficult!
Fresh seed is essential!

 

I tend to think they need high temps. @shiney might prove me wrong but they do rot if they hang around, ie cool and wet.
I tend to use a 25C up to 30C for many seeds.

 

I sowed 10 seeds about 6 weeks ago in seed compost in an unheated propagator on a south facing windowsill and all but one came up. I think it may have to do with how fresh the seed is, I purchased mine from Chiltern Seeds. I have given away all but three , the ones I have kept are now 18 inches high and I think may need to be potted on (currently in 3 inch pots).

I managed to keep the last one I had grown for two years but this winter was its undoing. It was doing fine until the beast from the east finished it off.