Grafting tomatoes

The rootstock is a variety (in my case F1 submarine) that is resistant to viruses and other tomato ailments. In my greenhouse I have either or both of verticillum and fusarium wilts caused by fungi. The plants would crop very poorly and finish early if planted there. I'm not keen on growbags as they need watching for over/under watering and probably cost more than the submarines (50 seeds for £9.00).

So I'm growing tomato plants I want (gardeners delight, alicante...) and in a short while, I'll cut the tops off the submarines and replace them with tops cut off the tomatoes I want. I can then plant them out (when the cuts have healed and it's a bit warmer) in the greenhouse border.

I've done this successfully for the last couple of years with yields of 109kg from 20 plants in 2018, 78kg from 20 in 2019 and 41kg from 8 plants last year.

So far they just look like small tomato seedlings which I think you have all seen.