I use debris netting for brassicas too. I haven’t been aware of any problems with lack of light. All kinds of brassicas develop well. I’m wondering whether you’ve noticed any problems with your brassicas which might be caused by poor light?
When butterflies have found a way in I have usually found that there’s a small hole somewhere or I hadn’t pegged it down quite well enough. I’ve heard of people sowing up the black seams, which tend to have bigger gaps, but I’ve not done that and haven’t felt the need to.
The alternatives are black butterfly netting, either the softer kind or the more obviously plastic stiffer kind. . Both are more expensive. The softer kind catch and are rather easily damaged I find, and the stiffer kind is just not as pleasant to handle. I imagine they let more light in though.
And then there’s mesh such as Enviromesh. I don’t know how the light filtration compares but again it’s quite expensive.
Brassicas can stand a certain amount of shade so my own feeling is that debris netting works well but I’d be interested to know your experiences, G the P.
