You can listen to yesterday's GQT here:
http://www.bbc.co.uk/radio/aod/networks/radio4/aod.shtml?radio4/gqt
glallotments: it's interesting to learn what the RHS say about 'indicator plants' - I'm not convinced this is going to be a practical test for the majority. I want to do something for peace of mind next year and I guess everyone else that has suffered this devasation will. But it will mean getting all your compost ready and seed sown for trial very early in the season.
My own trial of tomato seedlings are showing the first results. After 7 days:
100% 'contaminated compost': 4 seedlings emerged.
50% 'contaminated compost': 1 seedling.
100% 'normal compost': none.
It's a paradox that the 'contaminated' compost appears to be 'better' at this early stage. I wasn't expecting this and speculate that the hormone effect of the weedkiller is stimulating germination.
('normal' compost is a peat free seed compost. 'contaminated' compost is the stuff I already had that has devastated my veg plot).
I will get a few photos of my trials, and maybe create a blog. This last weekend I started more trials using mustard, cress & onion. I have also ordered some soya bean seed.
My intention is to repeat the trials later in the year to see if there is any lessening of the weedkiller effect.
I had another thought about over- wintering a few rooted side shoots from tomatoes. Maybe these can be nursed indoors and used in the early spring as indicators. Anyone ever done this?