The weather forecasts do seem to be a lot more accurate now than several years ago, but they do go a bit over the top with their 'wild' weather warnings now after the Michael Fish episode.
Yes - I have been doing this for years and it really does work and quickly too.
They have probably had a shock as your conservatory has been very warm and we have had cold high winds recently which have probably scorched your plants. Try again there is still time.
I wouldn't take the risk of letting it grow on just in case it is JKW and it looks like you have lots of lovely plants in your garden anyway. If you do dig it out keep a close eye on that area in case any more pops up in which case I would weed killer it.
I class this as a 'good' weed as it is so easy to pull out or leave if you like it - hate the smell though if you touch it.
I'm glad Monty gave advice on growing streptocarpus as they are so pretty and not often covered in programmes.
They were a bit odd...can't see the point of them.
Lucky lady and lucky bees......
After sampling White Lady last year from another allotmenteer I have been converted as the flavour was so good. I had 100% germination and they are growing out in the allotment now and look really healthy.
They have been particularly good in the hedgerows this year, around our way.