When you get to the bottom, tie the cord to the leg to secure it.
Plant your plants around the legs and help the young plants find the poles and rungs by wrapping the immature shoots around the poles while they get established.
The plants will grow all around the rungs as they grow upwards. When the season is over, the cord rungs can be discarded, leaving the binding holding the poles together intact. The tripod frame should be removed from the ground and stored in a shed for re-use the following year.