attaching plastic to tubular steel

I have inherited a polytunnel type greenhouse with my new allottment but the cover which goes over the tubular frame has partly come off. I was trying to get it back on but in the end bought it home with me as I couldnt do it! It seems to go over the metal structure by means of velcro ties which attach round the framework but these ties have come off. I am not very practical in things like this and need a means of getting some type of fixture back on it so I can attach it. Realise I have not explained my self very well! The plastic sheet which goes over the frame is some kind of re inforced plastic made up of little green squares.

 

L-G is there no way you can re-attach these ties?

 

well there were sewed in originally and they have now been lost. I am going to have a go at cable tying in onto the frame and see what happens

 

I agree,cable ties. Or velcro tree ties, which would be easier to adjust.