I bought two tubers and planted one either side of the Morello cherry. I put in a bamboo cane next to each so that it could climb up into the canopy of the cherry. It started off fairly slowly with a couple of shoots tentatively climbing up the pole in April.
The frame worked well but I didn't anticipate how well the mashua plants would do. By the end of the summer they had reached right to the top of the frame and covered two sides of it and most of the top. The weight of the foliage was too much for my flimsy frame and pulled down one corner squashing the cherry for the second year in a row!
The plant is still thriving at the beginning of November giving a supply of tasty edible leaves which are not too different from its relative the garden nasturtium (Tropaeolum majus), which is also still growing in the garden but starting to die back from the cold now. Mashua is renowned for being pest and disease resistance. The video below shows how it is thriving despite acting as a route for the snails to come and feed on the shedding leaves of the cherry tree beneath it.