Posted: 17/05/2014 at 09:29
Clive, I have to say that on this occasion, your poly-tunnel isn't doing your any favours. When I said in my previous message that your flowers should be alright for the big day, I was thinking more along the lines of them being outside.....of course, your poly-tunnel will be pushing the calculation forward.
I know growers use poly-tunnels regularly to ensure blooms for specific dates such as the Malvern Spring Show and even Chelsea on some occasions and they do offer the added advantage of blooms being undamaged by weather.......but for blooms required between June & August, autumn sown seed as described earlier is all that's required.
For a special occasion between July & September, March sowings would be appropriate.
PS. Would have a plan B.