Young tomato plants showing the twine trellis that will support them as they grow.
A strong line is tied to the roof of the greenhouse at one end and loosely around the main stem of the young tomato plant at the other. The stem is carefully wound around the supporting line as it grows and, depending on the variety, it could eventually reach the roof which is 3 metres above the floor.
The tomato plants have to be pruned frequently to remove the extra branches that sprout between the main stem and the leaves. This method of pruning has the advantage that much larger fruit are produced. The variety growing here is “Grosse Lisse”.