Plants I will never grow again

I might give it a go then, thanks. Although the 36 degrees registered today may defeat it 

I do, have or would try any of those on the list so no vote from me!
Pak choi just bolts - seedling leaves, flower stalk, bam, dead, but giant vegetables of any sort probably top my list.

You need Joi Choi F1 in your life, it's the most bolt resistant pak choi I've grown, doesn't go to seed until mid-May from a February/March sowing. I've just planted some more in the ground to see how quickly they go to seed at this time of year.

Those plants have only just started to go to seed and formed really nice, big heads. I barely watered them after planting, keeping the soil more moist may have extended their life a bit more.

I'm very jealous! But will give it a go next year, thanks   although even reliable brassicas are struggling in the exceptional (I hope) heat this year!