Have had loads of inquiries about how to deter Aphids without using chemicals.
You could plant onions, garlic, coriander and french marigolds to put them off (incidentally they love Nasturtiums so perhaps planting these could attract them away – works to keep caterpillars off your cabbages too, but I always feel so sorry for the Nasturtiums! )
Before I suggest other stuff though, emphasise that I’m not trying to sell you anything it’s just that we do have various remedies because that is what we’re all about, using nature’s natural stuff to help solve problems.
Firstly there are bio controls http://www.thenaturalgardener.co.uk/aphids.php these are mainly little wasps that get stuck in, they are only suitable for greenhouse application though, but they certainly won’t sting you !
Secondly we have had a lot of success with Neem Oil http://www.thenaturalgardener.co.uk/pure-organic-neem-oil.p… this is quite thick though and you keep on having to shake the sprayer, coating the leaves and stems really helps ( though some people think it’s smelly.)
Then there is a solution made from boiling soap nut shells http://www.thenaturalgardener.co.uk/soap_nuts.php, let it cool and spray all over.
We have heard of people digging in banana peel around plants, but a surest, most natural, method is getting lacewings, ladybirds and hoverflies into your garden and I have shown below just some plants that will attract them.
(Always feel the Hoverfly gets a really hard time – whopped regularly because people think they are wasps!)
Achillea – ladybirds and lacewings
Alyssum – hoverflies
Alyssum – hoverflies
Angelica gigas – lace wings
Convolvulus minor – ladybirds and hoverflies
Cosmos bipinnatus – ladybirds and hoverflies
Daucus carota (Queen Anne’s lace)- ladybirds, lacewings and hoverflies
Limonium latifolium (Statice) – hoverflies
Lupin – hoverflies
Petroselinum crispum (parsley) – hoverflies
Tanacetum vulgare (tansy) – ladybirds and lacewings.
Tagetes tenuifolia Marigold – lemon gem – ladybirds and hoverflies (This plant deters Aphids by itself.)
There are some weeds that are also ideal to attract these good guys – Dandelions for example – but maybe that’s going too far (but I leave an entire patch ‘cos bees like them too!)
Have a great season.