I constructed a bean frame out of bamboo canes for the climbing French beans (taking up two beds, up, across, down, so I could walk under it to pick beans) and reinforced the supports with canes at an angle to introduce triangles into the structure (which theoretically can't be distorted). Last month when the beans were producing prolifically it showed signs of distortion under the weight of the plants and crop, so I reinforced four of the vertical supports with shrub posts hammered into the ground and tied to the bamboo canes with cable ties to hold the bamboo cane supports vertical. I have recently been away for a couple of weeks visiting and looking after my father and I come back to find they have cropped prolifically again (and the beans have got huge because of the time away), and the structure has partially collapsed under the weight. The cable ties holding the canes to the shrub stakes have snapped and half of it has partially flopped down. I can only get under it at one end. The canes have been heavily bent not quite to the point of snapping but they are not far from that. This is the second consecutive year a bean frame construction from canes has collapsed (last year I made a simpler A frame that couldn't take the weight). Does anyone have suggestions for stiffer and stronger materials I could use to build the frame next year, or even suggest a way I could build the frame stronger with canes, although I think bamboo canes are not up to the job the way they keep bending almost in half.