Posted: 13/11/2014 at 08:58
As I've said many times, the cause of this spindly growth is because of too much warmth. Having said that and in fairness to Yviestevie (and probably others) the onset of a particularly mild spell after sowing the seed didn't help.
I took the precaution of germinating my seed outdoors where they remain until I put them in a cold frame when we get some more seasonal weather.
Nothing much can be done until we get some cold weather, when the growth will hopefully stop.....then at a later date the tops can be nipped out.
On reflection and in view of the unseasonal weather we get these days, perhaps it may be worth considering sowing our seed in mid-Nov.