The Daily Telegraph has an article about what to plant, to attract creatures that eat aphids: Let them eat aphids
The good insects:
- Lacewings are delicate insects with translucent pale-green wings; greenfly are their favourite food.
- Hoverflies are like miniature darting wasps, while parasitic wasps are skinny and narrow-waisted members of their family. They lay their eggs in soft-bodied insects, mainly caterpillars, and the grubs feed on their hosts, killing them in the process.
Plants they like:
- Early flowering plants such as wallflowers
- Herbs, eg, sage, lavender, mint
- Amaranths, loved by ladybirds
- Parsley and other umbellifers These attract lacewings, so include fennel, dill or angelica in your borders, or plant sweet cicely and cow parsley in shadier areas.
Encourage birds to the garden.
Dig a pond, and the toads, frogs and dragonflies that establish themselves will love slugs and parasites.
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I'm compiling a list of techniques for getting rid of aphids on my website (http://gettingridofaphids.com) and would be grateful for any other tips and tricks if anyone has any to share :)