The twine gently supports the branches of the tomato plant, providing some 'give' as it grows outward and upward.
You will notice how the plants have grown in my next post about the whole garden in general!
I wish the garden was larger, but this is an extremely hot year to try and keep it alive and growing. In fact, it has been too hot for some of our tomato plants to set their blossoms.
Hope you are enjoying summer tomatoes from your own (or a friend's) garden this summer!
There's just no comparison to grocery store tomatoes.