This year I found out that although the plants will die away during the winter, their seeds are frost hardy (at least down to −6°C). So come the spring and I will sow a lot of morning glories at the foot of a long ivy covered wall in my garden, in the hope that the glories will use the ivy as kind of a live trellis support and make the ivy more colourful during the summer. And if this works, I hope the seeds will germinate the year after and perpetuate the cycle.