[Norfolkgrey]

I am only going by what I have read. Submarine is described as not edible http://www.sowseeds.co.uk/products/tomato-submarine-rootstock-seeds and I can't find anything now but I am sure I read that another variety was not edible 

[LotuSeed]

Rootstocks aren't usually bred for flavor, but rather vigor or disease resistance or both. While not palatable, I don't think they are actually inedible.

[wil4025]

Thread updated with great news!

[wil4025]

Right I have some news and im afraid no photos. My results

I found the grafted over normal plant grew quicker, smaller leaf growth, more flower growth and continued flower/fruit growth on same truss, more fruit and bigger on each truss. I had bad results all round with not enough season to get a full result on fruit weights etc as lots of them didn't get big enough to even count as anything in my opinion.

The best form of graft was called apical wedge, it formed a better graft and healed well with grafting clip. The other method I used was whip and that was not as well. I found it is very important to choose the same scion and rootstock and cutting same, if not then you will get a failed plant.

Things I will do better

- More shading at first stage of graft/propagation.
- Grow more grafted plants (20) so if some fail due to poor graft connection. If more than needed then I will sell.
- Give three-four weeks for healing (meaning starting earlier than normal).
- Grow scion two weeks before rootstock.
- I now have a grow light so will have better results in darker months.