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The goal is to measure the yields of yamberries on vines 3, 4, and 5 years old.
Each participant should build a trellis for easy harvest of the aerial tubers. When they are ripe you should have easy access to place a tarp or blanket under the trellis. Shaking the vines will result in almost all of the yamberries falling to the tarp for easy collection. Trellises should be fairly sturdy as the vines can grow 15-20 feet high and are robust. Report how many square feet of ground your trellis will cover. Mine will be a horizontal cattle panel 4x16', laid flat at 5' high, supported by metal t-posts.
After you build your trellis, plant your yamberries and care for them until they are mature beginning in year 3. At that point, harvest and weigh your aerial tuber yield each year for years 3, 4 and 5. After weighing them you can eat them! Boil them for 10 minutes and add salt, they taste just like new potatoes. Or add them to stews in the last 10 minutes or so. After the year five harvest, if you like, you can dig up the "mother tubers" underground. They are brittle but large and delicious.
I can send yamberries this fall to folks in the US, or you can order them from Oikos Tree Crops, that's the source of the variety with the largest aerial tubers that I am aware of.