Plant supports from recycled plastics

It says avoids water wastage. I wonder how it's doing that?? I've looked at the link but my French is rubbish it looks interesting!! This is what I have been trying to do for a few years.

I would love to grow everything but over the years I've begun to realise that as I have to pay for water it's only sensible to grow on any seedling that I think I can use. I have benefited- less cost and time - but my friends, neighbours and any passerby's have lost out as I have half the spare plants available now . I try not to grow things that get "wasted" or use resources and don't get used.I was asked for tomato plants 3 times this week and I have none spare!

I'm on metered water too but rarely use any of that for the garden as there's usually enough in the waterbutts for the GHs and pots.  Go on, Scarlet, grow them all, you know you want to share!