Slugs & Snails
Usually the bane of every gardener, snails and slugs can actually be relatively easily deterred from your windowbox, provided that you start off with slug-free and slug egg-free compost. One of the best deterrants is to run a strip of copper foil (available at garden centres) around the top of your windowbox. This generates a very low electric current, effectively creating an electric fence that your slimy foe won't cross! Around your plants you could also put coffee grounds, bran or egg shells, all of which slugs & snails hate, but which will need renewing form time to time.
Top Tip 1 : Plant red varieties of lettuce and they'll be untouched by slugs & snails!
Top Tip 2: Plant well-established pot-grown plants whenever possible as these will prove sturdier to any slug or snail attack
Aphids : Greenfly / Blackfly / Whitefly
For small infestations of any of these tiny, but nasty pests the best thing is to just squash the critters with your fingers - It's best to do this early on as they can reproduce themselves exponentially in a very short space of time, at which point they can be really problematic. For larger infestations or to get those hiding out of reach of your fingers you can spray your plants with various organic pesticides - Manufactured ones can be bought from a garden centre or you can make your own, by boiling garlic or rhubarb leaves and using the concentrated liquid (obviously make sure you thorougly wash your crops after harvesting)
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