I have heard that you should always double up on grow bags. I.e. one on top
of the other (so the roots have more room to grow)

..

Is this true? If so how many tomatoes plants should I get in a double pair
of grow bags, I know it won't be 6, but would I put 4 in there?



Also is it me or have grow bags got thinner over the years , I seem to
remember them being the same size a 75L bag of compost.