Good enough to eat
Protecting salad crops: If you want to stop your prize lettuces being decimated by greenfly and blackfly, invest in some insect-proof mesh, available from specialist organic gardening supply firms.
The mesh, which needs to cover your low-growing crops and be weighted down with bricks, not only screens out predatory insects but also keeps birds and cats at bay, but allows rain to pass straight through it and reduces evaporation by sheltering crops from wind, so the soil doesn’t dry out so fast. It can also be used in summer as, unlike horticultural fleece which traps heat underneath, it won’t cook your crops.
Make sure you put it on as soon as you start sowing or you may just trap insects underneath it.
Also, be aware it won’t deter slugs and snails, which may creep in underneath, so you’ll need to be vigilant. And if you are growing beans, peas and courgettes, which need pollination, you’ll need to uncover them once they start flowering or the bees won’t be able to access them.