Should seed trays be dark?

[fran]

Morning all!

I'm sowing seed in recycled plastic trays, amongst other things, and wondered if I should line the clear ones with something to make them dark. Does it matter if roots glimpse the light?

Info appreciated. Fran

[Two_Sheds]

I have found that light coloured pots and trays encourage green algae/mould (thinking of vending machine coffee cups in particular)

[rustylady]

Dark is better, but use whatever you can if it's free.

[j r hilton]

I've been sowing seeds in chineese take away trays and putting them in my propagator to germinate without any problem at all.