Scaffold netting is the cheapest option but there is a small gap all the way down the net which can allow flies to get in. Thinking of cabbage root fly. My wife sowed this gap up on both our old scaffold nets. I now use this company www.easynets.co.uk its a family company based in the north east. If you are putting over raised beds then you can buy by the metre from easy nets with various widths available. There is also gardening naturally which a bit more expensive. I have 7 nets in total 2 scaffold nets and 5 carrot fly type nets which I use for brassicas and alliums. On our site if you don't cover it you will loose it.
Have a think about tulle, it's the material that bridal veils and tutus are made of.
It's pretty cheap to buy on the internet - selling by the metre in various widths, colours, and you can even buy it with/without sparkles (come to think of it, the sparkles may detract birds?). It's not very strong and for that reason should a bird get it's claw caught in the net it should be able to break free. Cut up in little pieces it's easy to wrap around plants; bit like a collar, secured with a twig or piece of wire.
I've made a rolled-up collar in black around the whole of a raised bed, and it's so far so good!
Personally, I wouldn't give Amazon money in any way shape or form. Better places to buy any kind of products without resorting to that organisation, especially something as readily available as scaffold netting - or any other netting.
The size of hole required will be based on the type of problem. Pigeons are a different problem compared to carrot fly, for example, and the wrong type can create the kind of event that @pansyface describes.
It's a place where beautiful isn't enough of a word....
I live in west central Scotland - not where that photo is...
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I have used this company in the past and found their products to be both very well made and attractive to look at.
I don’t however use netting in my garden anymore, following the fatal effects on a baby robin that became entangled in it some years ago.
https://www.harrodhorticultural.com/harrod-slot-and-lock-vegetable-cage-1-5m-h-pid8730.html
If you live in Derbyshire, as I do.
It's pretty cheap to buy on the internet - selling by the metre in various widths, colours, and you can even buy it with/without sparkles
I've made a rolled-up collar in black around the whole of a raised bed, and it's so far so good!
https://www.susansinthegarden.com/guides/organic-pest-control/organic-pest-control-products-methods/tulle-netting/
Cambridgeshire/Norfolk border.
Better places to buy any kind of products without resorting to that organisation, especially something as readily available as scaffold netting - or any other netting.
The size of hole required will be based on the type of problem. Pigeons are a different problem compared to carrot fly, for example, and the wrong type can create the kind of event that @pansyface describes.
I live in west central Scotland - not where that photo is...