Greenhouse Material

Hi
On my plot, I have a greenhouse that I didn't really use last year as I only just took on the plot early summer. I'm thinking it would I great place to start to use it now and get some planting early. My issue is that a lot of glass is broken and in need of replacement. I don't particularly want to replace it with glass, even though it is the best I know it is pricey and I have a great big tree nearby that is to blame for the breakage, so I don't want to be doing this as a yearly change. What else could I use?? I don't really want to spend a lot on this. Is their any cheap material that I could use to replace a few broken panels, and empty spaces...plastic?? or a sheet.... ideas? Thanks

Last year, I covered mine with polytunnel plastic, but sadly, it ripped in the first storm we had.
Anything cheap is worth a try, I suppose, as long as you won't be too upset if you lose the seedling/plants inside.

 from what your saying its that the tree is causing the damage from what ?  is it branches falling of the tree on top [roof] of the greenhouse and does this happen when its windy bringing down the branches

if the pieces falling of the tree are small but are breaking the glass then as Andy is saying strong perspex
 or plastic sheets cut to size could be an idea fixing with W clips now and if your greenhouse has a gulley where you fix the glass into you could consider getting some strong weldmesh or reinforcing steel mesh that's used for reinforcing concrete placing it on top of the greenhouse and securing it so it fits over the top
so the pieces fall onto the mesh ?

if i had that problem i would be constructing 4 post's at each corner of the greenhouse then put some strong scaffolding netting on the post's pulled tight like a football goal to catch the pieces of wood falling on it although there will be some cost whatever you do its the long term fix?

we had a similar problem [not a greenhouse] but every time you doing something  on one part of the plot the tree branches where hitting you in the face so asked the farmer if i could trim the branches and he said not a problem as ling as you don't cut the tree down  so the tree's going to get a good haircut with my chainsaw very shortly as soon as the snow goes and by the time the branches grow back i wont be gardening  that plot

hope my comments help and good luck with whatever you decide to do

If it’s going to be an ongoing problem with the tree that you cannot rectify, might it be worth moving the greenhouse to a safer position & reglaze then? More work initially but not in the long run