Posted: 16/08/2012 at 20:25
Thanks for your advice everyone. I've binned the plants already as the infection was really beginning to take hold and I'm sure it was blight as I lost my potatos a few weeks ago too (och well, always next year!). I think it was my own fault though as I relied too heavily on the automatic vents which I had set wrongly and setup a water butt irrigation on a timer. When I realised the leaves of the plants were soaking from condensation it was too late. The louvre vents couldn't cope and I didn't check everyday this July but will next year.
I grew the plants in the greenhouse border, should I remove any of the soil or will a good airing and scrub of the greenhouse with the good old cider vinegar do?
On the upside, the brussels sprouts are looking good so far where the potatos were and my herbs are great!!