Topic: Polythene Cloches / Tunnels

[KevTetley]

I have an alomost endless supply of large sheets of blue polythene.

Is it ok to use BLUE ploythene to make polytunnels  / cloches or will it be restricitive to the light?

Thanks

K

[Robert_Brenchley]

Not only does it cut off a great deal of light, but a lot of it (maybe all? I'm not sure) disintegrates in sunlight, and you get nasty little bits scattered all over the garden.

[Si]

Plants absorb blue and red light for use in photosynthesis. Green light is reflected because the plants cannot use it to make food. If you put a blue polythene sheet over your plants, it could act as a filter and block the useful blue light!

[KevTetley]

Excellent - I remembr my A level Biology now!! 

Thanks